最新刊期
卷 65 ， 期 2 ， 2026
- 摘要：To support the "Dual Carbon" goals under global change， elucidating the spatiotemporal dynamics and driving mechanisms of carbon storage in arid mountain-oasis-desert systems is crucial for achieving regional carbon balance and sustainable development. This study applied the InVEST model to estimate carbon storage from 1990 to 2020 in the north slope of the Tianshan Mountain. By integrating mountain-descent gradient analysis and bivariate spatial autocorrelation， we systematically revealed its spatiotemporal patterns and the linkage with the gradient. The optimal parameter-based geographical detector was then used to investigate the driving factors. The results indicate that： 1） Temporally， carbon storage decreased initially and then increased， with a net gain of 4.06×107 t since 2000， primarily attributed to the conversion of unused land to cropland and grassland. Spatially， it showed a belt-shaped decreasing pattern along the gradient. 2） Carbon storage was positively correlated with the gradient. Areal carbon density followed a "stable-then-sharp increase" pattern with increasing elevation， reflecting a dynamic equilibrium between human activities and natural constraints along the topographic gradient. 3） The driving mechanisms exhibited spatial heterogeneity： dominated by anthropogenic factors at low gradients， by human-land interaction at medium gradients， and by natural controls at high gradients. Temporally， the dominant drivers shifted from socioeconomic factors to land-use intensity， and finally to a dual synergy between socioeconomic activity and nighttime light intensity， indicating a regional transition toward more refined spatial governance. This study enhances the theoretical understanding of human-land coupling in mountain-oasis-desert systems and provides a scientific basis for territorial spatial optimization and carbon sequestration enhancement in arid regions.关键词：the north slope of Tianshan Mountain;carbon storage;InVEST model;mountain basin gradient effect;optimal parameter geographical detector214|265|0更新时间：2026-03-18
- 摘要：Amid escalating synergistic pressures on population， land， and food resources， elucidating the adaptive evolution of the human-land-food nexus is crucial for regional sustainable development. Utilizing data on population， arable land， and grain in Xinjiang from 2000 to 2020， this study applied an adaptability quantification model， a four-quadrant model， a Markov transition matrix， and an obstacle degree model to reveal its spatiotemporal evolution and coordination mechanisms. The results show that： 1）From 2000 to 2020， the comprehensive development index of the coupled system increased from 0.157 8 to 0.218 5， with an average annual growth rate of 1.39%. The arable land and grain subsystems grew at rates of 1.99% and 1.90% per year， respectively， while the population subsystem grew at a lower rate of 0.32%. 2）System adaptability improved continuously， with the proportion of highly adaptable regions increasing from 20% to 31%， exhibiting an evolutionary pattern of “point breakthroughs to areal expansion”. 3）The proportion of regions in the first quadrant （high adaptability-high development） remained stable at 48%-56% and the Markov transition matrix showed a self-sustaining probability of 95%， indicating strong systemic stability. 4）From 2000 to 2020， the obstacle degrees of the arable land and grain subsystems declined from 45% and 43% to 40% and 25%， respectively. In contrast， the obstacle degree of the population subsystem rose from 12% to 35%， suggesting that population and arable land have gradually become the primary bottlenecks for coordinated development. This study provides a valuable reference for analyzing the human-land-food nexus in arid regions and offers insight to assist Xinjiang in optimizing population distribution and land-use structures under multiple resource constraints， thereby enhancing grain production resilience and fostering high-quality and sustainable regional development.关键词：human-land-food;four-quadrant model;adaptability;obstacle degree;Xinjiang185|169|0更新时间：2026-03-18
- 摘要：Understanding the variation characteristics of vegetation phenology and its response mechanisms to climate warming and wetting in the Ebinur Lake basin is essential for elucidating ecosystem carbon and water cycles in arid regions. Utilizing MODIS EVI time-series data from 2001 to 2021， this study extracted key vegetation phenological parameters in the Ebinur Lake Basin employing the dynamic threshold method. Partial correlation analysis and driver attribution analysis were conducted using temperature and precipitation data. The results revealed the following general trends of vegetation phenology from 2001 to 2021： the start of the growing season was delayed at a rate of 0.17 d/a， the end of the growing season was slightly delayed at 0.06 d/a， and the length of the growing season length was shortened at a rate of -0.42 d/a. However， none of these trends were statistically significant（P>0.05）. The relationships between climatic factors and vegetation phenology were complex and exhibited considerable spatial heterogeneity. In certain local areas， the start of the growing season was significantly positively correlated with both temperature and precipitation， whereas the end and length of the growing season were significantly negatively correlated with them （P<0.05）. Moreover， vegetation phenology was more sensitive to precipitation than to temperature. While climate warming and wetting served as notable driving effects on phenological variations in some local areas， non-climatic factors， such as land use patterns， irrigation and grazing activities， topography， and soil properties， etc.，had a more pronounced influence across most of the basin. These findings offer a scientific basis for promoting the sustainable and healthy development of inland lake basin ecosystems in arid regions.关键词：vegetation phenology;warming and humidification climate;climate response;spatiotemporal variation;Ebinur Lake basin178|198|0更新时间：2026-03-18
- 摘要：To investigate soil water movement under line-source drip irrigation， a study was conducted using an indoor soil tank setup with three emitters on sandy loam soil from the Emin Irrigation District in Xinjiang. The experiment included three emitter spacings （10， 20， and 30 cm） and three emitter flow rates （1.0， 1.5， and 2.0 L/h）， resulting in a total of nine treatments. The wetting front dynamics were monitored over a 6 h irrigation period. The results showed that： 1） Both the horizontal and vertical wetting front movement distances were best described by a power function of infiltration time （R²>0.98）. 2） At the same emitter spacing， higher flow rates resulted in shorter wetting front convergence times （the shortest being 1 min） and shallower vertical infiltration depths at convergence （the shallowest being 4.2 cm）. However， they led to greater final vertical infiltration depths at the end of the irrigation period （up to 39 cm）. 3） At the same emitter flow rate， larger spacings led to longer wetting front convergence times （up to 55 min） and deeper vertical infiltration at the moment of convergence （up to 11.5 cm）. However， they resulted in smaller final vertical infiltration depths at the end of irrigation （as shallow as 23.1 cm）. This study elucidates the synergistic mechanism of emitter flow rate and spacing on the wetting pattern， providing a scientific basis for optimizing drip irrigation system parameters and design in the Emin Irrigation District.关键词：sandy loam soil;line-source infiltration;moist front;interference infiltration156|284|0更新时间：2026-03-18
Column of land use and ecological evolution in Xinjiang
- 摘要：The Heyuan area is located on the eastern margin of the South China Block， where large granite outcrops are prominently exposed. To investigate the stress history of the granite in this region， a series of uniaxial compression tests were conducted. The stress characteristics of the granite were analyzed based on the Kaiser effect observed in acoustic emission （AE） signals. The AE results indicate that： 1） during monotonic uniaxial compression， the AE activity can be divided into three distinct phases： a low-activity phase， a rapid growth phase）， and a burst phase； 2） in the case of incremental cyclic loading， the cumulative AE ringing counts exhibit a stepped increase； and 3） the constant-amplitude cyclic loading demonstrates a typical Kaiser effect. The G-P algorithm was employed to calculate the correlation dimension of AE ringing counts， characterizing the fractal scaling of damage evolution. The point with the minimum correlation dimension， located near the approximate Kaiser point， was identified as the critical stress point satisfying the Kaiser effect. Furthermore， the Felicity ratio derived from cyclic loading data was used to validate the Kaiser effect. Based on this analysis， the maximum historical differential stress of the granite in Heyuan was determined to be 79.1 MPa. It is inferred that the granite formed at a depth of approximately 3.9 to 6.6 km， and that block uplifts since the Cenozoic era have caused a surface rise by about 3.5 to 6.2 km in the Heyuan area. The result provides new evidence for the study of tectonic evolution in south China.关键词：acoustic emission;Kaiser effect;granite;historical stress;Heyuan166|253|0更新时间：2026-03-18
- 摘要：With the acceleration of industrialization and urbanization， cadmium （Cd） poses a serious threat to estuarine ecosystems and human health due to its high toxicity. As a typical estuarine wetland， the intertidal mangrove zone provides a pivotal place for the geochemical cycle of heavy metals， yet， the mechanisms regulating Cd migration and transformation in its sediments remain poorly understood. Focusing on the intertidal zone of Qi’ao Island in the Pearl River Estuary， this study systematically analyzed the spatial distribution of total Cd and its geochemical fractions in sediments. We applied the diffusive gradients in thin films （DGT） technique to investigate the seasonal variations of labile Cd across the overlying water-sediment interface， aiming to clarify the spatial pattern and the underlying geochemical mechanisms of Cd fixation and remobilization， thereby providing scientific guidance for regional pollution control. The results show that the total Cd concentrations in mangrove sediments are significantly higher than those in tidal flats （P<0.05）. Cd is predominantly present in the acid-soluble fraction （37%-50%）， which exhibits high remobilization potential and bioavailability. In winter， the reductive dissolution of Mn oxides is identified as the primary driver for the significantly elevated DGT labile Cd concentration in surface sediments （1.07±0.16） μg/L. In contrast， under high-temperature conditions in summer， the mineralization of organic matter promotes sulfate reduction， leading to the formation of CdS precipitates as the primary control on the decrease in labile Cd concentration （0.07±0.02） μg/L. Moreover， mangrove roots retain suspended particles， and the associated organic-rich， weakly acidic environment facilitates Cd accumulation while suppressing its remobilization. This study provides a scientific basis and theoretical support for controlling sediment Cd pollution and formulating mangrove restoration rstrategies in the Pearl River Estuary.关键词：cadmium;mangrove;sediment;diffusive gradients in thin films（DGT）;spatiotemporal distribution;remobilization mechanism132|180|0更新时间：2026-03-18
- 摘要：The year 2023 witnessed extreme climate anomalies worldwide， including in Guangdong. This study investigated the climatic trends in Guangdong over the past six decades， focusing on the characteristics and causes of anomalies observed in 2023. The analysis relied on daily observational data from 86 national meteorological stations in Guangdong， covering the years 1961 to 2024， and utilized methods such as linear trend analysis. The results indicated that over the past 60 years， Guangdong has experienced a significant increase in annual average temperature， along with a rise in the number of high-temperature days. Precipitation and heavy rainfall days exhibited decadal fluctuations and interannual variations， while the total number of rainy days decreased. The climate of 2023 exhibited several distinctive features： exceptionally high temperatures and prominent heatwaves， frequent regional heavy rainfall events featuring extreme short-term precipitation and a prolonged flood season， and a typhoon season characterized by a late first-landfall typhoon but overall higher frequency and intensity of typhoons. The primary causes of these anomalies were identified as follows： Below-average precipitation during the early flood season was mainly associated with the preceding La Niña event， reduced snow cover over the Tibetan Plateau in the previous winter， and an intensified East Asian Summer Monsoon. In summer， the combination of above-average temperatures and below-average precipitation was influenced by the development of El Niño， warmer-than-normal sea surface temperatures in the Indian Ocean， and a stronger， westerly-shifted Western Pacific Subtropical High （WPSH）. In autumn， above-average precipitation resulted from the combined effects of El Niño， meridional shifts in the position of the WPSH， the activities of four typhoons that closely approached or made landfall， and the specific configuration of the westerly circulation.关键词：climate characteristic;high temperature;rainstorm;Guangdong136|309|0更新时间：2026-03-18
- 摘要：Seasonal variations reflect the regular annual changes in global and regional climate patterns， serving as important references for human activities and planning. Focusing on Guangdong Province， this study analyzed onset dates and lengths of different climatic seasons across historical years using daily average temperature observations from 86 national meteorological stations from 1981 to 2024， adhering to the Chinese industry standard "Climate Season Classification （GB/T 42074—2022）". Using linear regression analysis and trend coefficient statistical methods， we systematically investigated the spatiotemporal distribution and changing patterns of climatic seasons in Guangdong， quantifying their responses to regional climate change. The findings are as follows： 1） Most of Guangdong Province belongs to a "winterless" zone， with only the northernmost part being a four-distinct-season zone. 2） Significant spatial heterogeneity exists in the onset dates of climatological normal seasons. Within the four-distinct-season zone， spring begins earlier in the south and later in the north， while winter starts earlier in the north and later in the south. On average， summer and autumn commence on April 10 and October 31， respectively. The climatological lengths of spring， summer， and autumn are 94， 204， and 62 d， respectively， while winter lasts for 40 d in the four-distinct-season zone. 3） From 1981 to 2024， in the four-distinct-season zone， the onset of spring and summer showed a slight advancing trend， while those of autumn and winter were slightly delayed， with no significant changes in season lengths. In the winterless regions， however， summer onset advanced significantly at a rate of 2.49 days per decade， while autumn onset was significantly delayed by 2.22 d per decade. This led to a significant shortening of both spring and autumn lengths and the significant extension of summer length by 4.71 d per decade. These trends reached statistical significance at the 0.01 level in some southern coastal regions.关键词：climatology;climatic season;season timing;season duration;Guangdong215|561|0更新时间：2026-03-18
- 摘要：Platelet shortages are a common issue in clinical practice， and the growing demand for platelet transfusions has made this problem even more prominent. Platelets generated through cell reprogramming may provide a promising solution to address this critical challenge. Here， we report that enforced expression of transcription factors Gata1 and FLI1 reprograms murine bone marrow B lymphocytes into megakaryocytes. Notably， the expression of Gata1 alone in B lymphocytes was sufficient to induce the activation of megakaryocyte-specific markers， such as Cd41 and Cd42. Co-expression of FLI1 or treatment with the Ezh2/Ezh1 inhibitor UNC1999 significantly enhanced reprogramming efficiency. After 10-14 days， the reprogrammed cells acquired megakaryocyte morphology， and some cells proceeded to form pro-platelets. Importantly， we found that B lymphocytes retain their plasticity even after immortalization， this maybe the reason that Gata1/FLI1 could reprogram both primary and BCR-ABL-immortalized B lymphocytes. These findings suggest that B lymphocytes are a promising starting cell type for generating platelets through cell reprogramming and may be more suitable for large-scale production compared to adherent cells due to their suspension growth characteristics.关键词：B lymphocytes;cell reprogramming;megakaryocyte;UNC1999105|615|0更新时间：2026-03-18
- 摘要：To investigate the physiological regulation of bullfrogs （Lithobates catesbeiana） under long-term heat stress， this study simulated a high-temperature and recovery environment to examine the effects of water temperature on growth， metamorphosis， and antioxidant function during the tadpole and juvenile stages. Three thousand six hundred bullfrog tadpoles at Gosner stage 25 ［7 d old； （0.04±0.00） g］ were randomly divided into 12 tanks， with 300 individuals per tank， and reared for 80 days at water temperatures of 24， 27， and 30 ℃， respectively. Subsequently， post-metamorphic juveniles were maintained at 24 ℃ for an additional 56 days. The results showed that， during the tadpole stage， final body weight （FBW）， weight gain rate （WGR）， and specific growth rate （SGR） did not differ significantly between the 24 and 27 ℃ groups（P＞0.05）， but their values were all significantly higher than those of tadpoles in the 30 ℃ group（P＜0.05）. The male ratio and metamorphosis rate in the 27 ℃ group were significantly higher than those in the 24 ℃ group， but lower in the 30 °C group（P＜0.05）. For juveniles reared at 24 ℃， FBW， WGR， SGR， and survival rate showed no significant differences between the 24 and 27 ℃ groups（P＞0.05）， but their values were all significantly higher than those in the 30 ℃ group（P＜0.05）. In terms of intestinal enzyme activity， protease and creatine kinase activities in juveniles did not differ significantly between the 24 and 27 ℃ groups（P＞0.05）， but both were significantly lower than those in the 30 group（P＜0.05）； lipase and acid phosphatase activities in the 24 ℃ group were significantly higher than those in the 27 and 30 ℃ groups（P＜0.05）. Regarding antioxidant indices， intestinal superoxide dismutase （SOD） and catalase （CAT） activities in the 24 and 27 ℃ groups were not significantly different（P＞0.05）， but both were significantly higher than those in the 30 ℃ group（P＜0.05）. In the liver， glutamic pyruvic transaminase， glutamic oxaloacetic transaminase， SOD， and CAT activities， as well as malondialdehyde content， did not differ significantly between the 24 and 27 ℃ groups（P＞0.05）， but all were significantly lower than those in the 30 ℃ group（P＜0.05）. The hepatic total antioxidant capacity values of juveniles in the 27 and 30 ℃ groups were significantly higher than those in the 24 ℃ group（P＜0.05）. In conclusion， a water temperature of 27 ℃ can promote the growth performance， metamorphosis rate， and male ratio of bullfrog tadpoles， and can enhance the antioxidant capacity of juveniles after stress， thereby improving juvenile growth performance. These findings suggest that maintaining 27 ℃ during the tadpole stage could optimize bullfrog aquaculture in subtropical regions under summer heat waves.关键词：high temperature stress;bullfrogs;growth;metamorphosis;antioxidant capacity;oxidative stress161|270|0更新时间：2026-03-18
- 摘要：Based on the "emperor， minister， assistant and courier " pharmacodynamic molecular groups of Huanglian Detoxifying Decoction identified by literature， series of integrated " emperor-minister" molecules have been designed and synthesized， including 6 ferulic acid-eugenol integrated molecules FE-n （n = 1-5，7）， 12 scutellarin-eugenol integrated molecules of S3E-n （n=1-5，7） and S5E-n （n =1-5，7） series. Results of in vitro antioxidant activity detected by DPPH assay indicated that FE-n possesses higher antioxidant activity than either single monomer when n > 3 under the premise of shielding the phenolic hydroxyl group of eugenols and retaining the phenolic hydroxyl group of ferulic acid， showing a certain degree of " emperor-minister" synergistic effect； however， S3E-n and S5E-n showed weak antioxidant activity because the phenolic hydroxyl group at 6-position of scutellarin was blocked. In the meantime， a glutamate-induced SH-SY5Y cell damage model was established to screen the anti-Alzheimer’s disease （AD） activity of target compounds. The results showed that all FE-n （n = 1-5，7） had an anti-AD activity， and FE-4 was the most active one； The relationship between the order of its anti-AD activity and chain length n corresponds to that between its in vitro antioxidant activity and chain length. Interestingly， except S3E-5， S3E-7 and S5E-5 showed a weak protective effect， the other compounds in S3E-n and S5E-n series showed no anti-AD activity. In the future， more appropriate linkers and connection modes need to be explored to reveal the inherent "emperor， minister， assistant and courier" molecular compatible law.关键词：Huanglian Detoxifying Decoction;emperor minister assistant courier;integrated assemble of pharmacodynamic molecules;anti-oxidation;anti-Alzheimer’s disease118|102|0更新时间：2026-03-18
- 摘要：Naphthalene， the most abundant polycyclic aromatic hydrocarbon in coal tar， is an environmental pollutant，but at the same time，is also a high-value chemical feedstock. Catalytic hydrogenation offers a pathway to transform naphthalene into more valuable products such as tetralin and decalin. Among various hydrogenation catalysts， the supported transition metal nickel （Ni） materials are considered promising non-noble metal alternatives due to their cost-effectiveness. In this work， highly dispersed Ni/SiO₂ catalysts were successfully prepared via a citric acid （CA）-assisted sol-gel method combined with a H2 atmosphere pyrolysis strategy. Through systematic characterization and catalytic performance tests， we comprehensively investigated the effects of CA content， pyrolysis atmosphere， and hydro-pyrolysis temperature on the physicochemical properties of the catalysts and their naphthalene hydrogenation performance. The results demonstrated that the 20% Ni/SiO₂-CA（H₂） catalyst， obtained with an optimized CA ratio and pyrolyzed under a H₂ atmosphere， exhibited superior hydrogenation activity compared to the CA-free control group and the catalysts prepared under other pyrolysis conditions. Notably， under identical low-temperature reaction conditions， its activity significantly surpassed that of a commercial Ru/C catalyst. This work provides a novel research avenue and experimental foundation for the development of high-performance supported metal catalysts.关键词：highly dispersed Ni/SiO2 catalyst;sol-gel method;hydro-pyrolysis;naphthalene hydrogenation107|113|0更新时间：2026-03-18
- 摘要：The synchronization problem of variable-order fractional third-order cubic chaotic system with reduced controller was studied. By using variable-fractional-order stability theory and finite-time adaptive sliding mode synchronization correlation conclusions， sliding mode function and variable- order fractional adaptive laws were designed to obtain the conditions of finite-time sliding mode synchronization. For the third-order system， only two controllers were designed to achieve adaptive sliding mode synchronization between the master and slave systems of the variable-order fractional third-order cubic chaotic system in finite time， thus reducing the number of controllers. Numerical simulations verified the correctness of the conclusion.关键词：sliding mode;variable-order fractional;finite-time;chaotic system95|157|0更新时间：2026-03-18
- 摘要：A class of mathematical model arising from electrohydrodynamics， which is capable of describing the drift， diffusion and convection phenomena of charged particles in dielectrics，are studied. The model mathematically exhibits as the elliptic-parabolic coupled quasi-linear dissipative partial differential equations， and characterized by strong nonlinearity， non-locality and strong coupled properties. By introducing some proper weighted functions based on carefully examining the algebraic structure of the equations， we establish the global existence of solutions to this system with the
- 摘要：The goal of this paper is to establish the boundedness of the p-adic fractional integral operator with rough kernel
- 摘要：By using the splitting method and constructing specific coloring methods，we proved the
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