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水土保持学报 2024年

作者：佟亚宁王彬王文刚周笑李力国 iftikhar farhan 北京林业大学水土保持学院北京林业大学水土保持学院重庆缙云山三峡库区森林生态系统国家定位观测研究站

[目的]探明土壤有机碳流失时空分布变化对土壤侵蚀强度的响应机制,以期为侵蚀环境下土壤碳循环机制研究提供基础数据,并为解决黑土“变薄变瘦”问题提供科学依据。[方法]选取松嫩平原典型黑土区的北安市、克山县、克东县、拜泉县等14个... 详细信息

[目的]探明土壤有机碳流失时空分布变化对土壤侵蚀强度的响应机制,以期为侵蚀环境下土壤碳循环机制研究提供基础数据,并为解决黑土“变薄变瘦”问题提供科学依据。[方法]选取松嫩平原典型黑土区的北安市、克山县、克东县、拜泉县等14个市（区、县）为研究对象,采用RUSLE模型并结合GIS空间分析技术分析东北典型黑土区2000—2019年土壤侵蚀与土壤有机碳流失的时空变化特征。[结果]研究区土壤侵蚀强度整体呈北高南低的分布格局,并以微度侵蚀为主;2000—2019年典型黑土区微度侵蚀面积占比上升趋势不显著,轻度及以上程度的侵蚀面积占比则整体表现为降低态势,其中87.91%的区域侵蚀强度等级未发生明显变化,仅有3.74%的区域侵蚀强度等级升高;土壤有机碳流失空间分布差异明显,总体呈北高南低的分布特征,研究期间土壤有机碳年平均流失强度为4.74 t/（km2·a）;2010—2019年土壤有机碳流失总量呈增大趋势,其中北安市流失量最大,为研究区总流失量的37.00%;2015—2019年间,土壤有机碳流失强度5 t/（km2·a）的区域面积占比上升,导致年平均流失强度增大;研究区北部土壤侵蚀强度高的地区由于有机碳含量丰富,使得其在遭受侵蚀作用时损失的有机碳总量相对较大,形成土壤有机碳流失总量的地域性差异特征。[结论]研究结果明晰侵蚀作用下土壤有机碳流失的时空变化特征,表明严重的土壤侵蚀是坡面土壤有机碳流失的重要驱动因素。

关键词：土壤侵蚀土壤有机碳 RUSLE模型时空变化东北黑土区

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Spatial distribution of trace elements associated with organic carbon along the Beiyun River basin, Beijing, China

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International Journal of Sediment Research 2022年第3期37卷 335-345页

作者： farhan iftikhar Shiliang Liu Yongxiu Sun Yixuan Liu Muhammad Imran School of Environment State Key Laboratory of Water Environment Simulation Beijing Normal University Department of Soil and Environmental Science Ghazi University Key Laboratory of Soil Resource & Biotech Application Shaanxi Academy of Sciences Xi'an Botanical Garden of Shaanxi Province Institute of Botany of Shaanxi Province

Pollution resulting from terrestrial and aquatic trace elements has become a severe problem across the world. Organic carbon(OC) content has a high affinity for metallic contaminants and it acts as a significant sink for trace elements. The decomposition of OC content directly influences the bioavailability of trace elements. The decomposition of OC content and OC distribution vary spatially, these processes affect the release of trace elements and need further research. In the current study, sediment samples from the surface sediment along Beiyun River(Section 1 to Section 4 from upper to lower reaches),which is situated in the rapidly urbanized Beijing metropolis, were measured for OC, moisture, hardness,and trace elements. The OC contents were found to have a substantial difference among all four river sections along the urbanized river gradient. Whereas the higher OC contents were found in Sections 2(Urbanized uplands) and 3(farmland) compared to those in Sections 1(forest) and 4(farmland and part of constructed areas). On the other hand, the highest value of the correlation coefficient was found among the different values of trace elements and OC content in the riverine zone of the Beiyun River basin. OC contents play a vital role in the transformation and origin of trace elements in the surface sediment of the Beiyun River basin. The One-way Analysis of Variance(ANOVA) was applied to compare the means of OC and trace elements at different sections indicating no significant difference. However,source identification of trace elements indicated that a geogenic source was responsible for higher contents of As and(69.95%). Simultaneously, the natural OC, agricultural activities, and industrial waste contributed about(21.10%) towards the Cd and Zn, and about 10% for Cr and Cu. The current study concludes that the absolute principle component analysis-multiple linear regression(APCA-MLR)method can be successfully used to investigate the trace elements(Zn, Ni, Pb, Mn,

关键词： Organic carbon content Trace element Spatial distribution Source apportionment Absolute principle component analysis–multiple linear regression (APCA-MLR)

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Plant Nitrogen Metabolism: Balancing Resilience to Nutritional Stress andAbiotic Challenges

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Phyton-International Journal of Experimental Botany 2024年第3期93卷 581-609页

作者： Muhammad farhan Manda Sathish Rafia Kiran Aroosa Mushtaq Alaa Baazeem Ammarah Hasnain Fahad Hakim Syed Atif Hasan Naqvi Mustansar Mubeen Yasir iftikhar Aqleem Abbas Muhammad Zeeshan Hassan Mahmoud Moustafa Department of Plant Pathology Faculty of Agricultural Sciences&TechnologyBahauddin Zakariya UniversityMultan60800Pakistan Centro de Investigación de Estudios Avanzados del Maule(CIEAM) Vicerrectoría de Investigación y PostgradoUniversidad Católica del MauleTalca3460000Chile College of Food Science and Nutritional Engineering China Agricultural UniversityBeijingChina Department of Biology College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Department of Biotechnology Faculty of Biological SciencesLahore University of Biological and Applied SciencesLahorePakistan Department of Plant Pathology College of AgricultureUniversity of SargodhaSargodha40100Pakistan Department of Agriculture and Food Technology Karakorum International UniversityGilgitPakistan Department of Biology Faculty of ScienceKing Khalid UniversityAbhaSaudi Arabia

Plant growth and resilience to abiotic stresses,such as soil salinity and drought,depend intricately on nitrogen *** review explores nitrogen’s regulatory role in plant responses to these challenges,unveiling a dynamic interplay between nitrogen availability and abiotic *** the context of soil salinity,a nuanced rela-tionship emerges,featuring both antagonistic and synergistic interactions between salinity and nitrogen ***-induced chlorophyll depletion in plants can be alleviated by optimal nitrogen supplementation;however,excessive nitrogen can exacerbate salinity *** delve into the complexities of this interaction and its agri-cultural ***,a vital element within essential plant structures like chloroplasts,elicits diverse responses based on its *** review comprehensively examines manifestations of nitrogen deﬁciency and toxicity across various crop types,including cereals,vegetables,legumes,and ***,we explore the broader consequences of nitrogen products,such as N_(2)O,NO_(2),and ammonia,on human ***-ing the intricate relationship between nitrogen and salinity,especially chloride accumulation in nitrate-fed plants and sodium buildup in ammonium-fed plants,is pivotal for optimizing crop nitrogen ***,prudent nitrogen use is essential,as overapplication can exacerbate nitrogen-related *** Use Efﬁ-ciency(NUE)is of paramount importance in addressing salinity challenges and enhancing sustainable crop *** this goal requires advancements in crop varieties with efﬁcient nitrogen utilization,pre-cise timing and placement of nitrogen fertilizer application,and thoughtful nitrogen source selection to mitigate losses,particularly urea-based fertilizer *** review article delves into the multifaceted world of plant nitrogen metabolism and its pivotal role in enabling plant resilience to nutritional stress and abiotic chall

关键词： Synthetic nitrogen nitrogen signaling sustainable agriculture eutrophication ammonium nitrate

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