Results 41 to 50 of about 9,608 (155)
九龙江流域河流磷输出对土地利用模式及水文状况的响应 [PDF]
, 2019 本研究应用现场监测、地理信息技术(GIS)、模型模拟和数理统计等方法,基于2015年3月至2017年2月九龙江流域不同主导土地利用类型源头小流域和两条干流河流表层水总磷(TP)、总溶解态磷(TDP)和颗粒态磷(PP)的浓度监测,探究河流磷浓度与输出负荷的时空变化特征,揭示九龙江流域磷输出对土地利用模式及水文状况的响应.结果发现,九龙江流域河流磷浓度和磷输出负荷具有明显的时空变异性.在空间上,农业流域>城市流域>自然流域,西溪>北溪.在季节上,不同类型流域不同形态磷浓度总体表现为春、冬季节较高,而夏 ...
唐莉, 肖才荣, 黄亚玲, 黄金良
core +2 more sources
Synthesizing Empirical Research on Learner Metacognition in Second Language Writing
International Journal of Applied Linguistics, EarlyView.ABSTRACT Despite considerable research interest in learner metacognition in second language (L2) writing, there is not yet a review that synthesizes the existing empirical findings and discusses their implications. To fill the void, this systematic review synthesized 39 empirical studies on learner metacognition in L2 writing and examined their salient
Chen Li, Icy Lee, Zhicheng Mao
wiley +1 more source
Shuitu Baochi Xuebao, 2005 以太湖典型地区宜兴市大浦镇湖滨公路以东50hm2蔬菜地为研究对象,网格法(50m×50m)采集表层(0～20cm)土壤156个,采用传统统计和地统计学相结合的方法,研究了土壤氮素及pH的空间变异特征。结果表明:土壤全N和NH4 -N有明显的空间变异结构。全N符合指数模型,NH4 -N变异函数符合线性模型,全N有强烈的空间相关性,NH4 -N有中等的空间相关性。土壤pH普遍偏低,pH变异函数符合指数模型,在小范围内具有强烈的空间相关性。土壤碱解N与pH呈显著负相关,表明施用氮肥是导致土壤pH下降的主要原因。
王彩绒 吕家珑 胡正义 杨林章 高义明
doaj +2 more sources
Spatially Downscaling of Future Food Demand for Policy Planning
World Food Policy, Volume 12, Issue 1, May 2026.ABSTRACT Understanding the subnational dynamics of food demand, while accounting for the evolution of the agrifood system at the global level, remains a challenge for designing food policy to ensure food security. To link global agrifood systems with subnational food policy planning, we downscale per capita food demand for 62 food commodities at the ...
Chun Song +3 more
wiley +1 more source
Comprehensive Geochemical Evaluation and Influencing Factors of Topsoil Nutrients in a Farming Area of Dabie Mountain in Western Anhui, China [PDF]
Western Anhui is an important precision agricultural area in China, characterized by diverse landforms and multiple soil types. To determine the spatial distribution of soil nutrient elements and their controlling factors, we analyzed 5 nutrient ...
Chao SONG +5 more
core +1 more source
World Water Policy, Volume 12, Issue 2, May 2026.ABSTRACT Water governance has emerged as a critical analytical framework for addressing the complexity of socioecological water systems in contexts of increasing climate vulnerability and anthropogenic pressure. This study presents a systematic review and bibliometric analysis of 50 scientific articles indexed on water governance published between 2018
Roger Pichis‐García +1 more
wiley +1 more source
Shuitu Baochi Xuebao, 2002 探讨了研究土壤空间变异所必须考虑的相关尺度问题，立足国内，兼顾国外，介绍了近年来土壤特性空间变异性几种研究方法及应用的研究动态，讨论了空间变异研究方法的各自特点及今后研究和应用的发展趋势，展望了空间变异性研究在土壤科学、水土保持与水资源系统中的应用前景。
李毅 王文焰 王全九
doaj
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT In conventional piezoceramics, the coordinated change between the dielectric constant (εr) and the piezoelectric charge constant (d33) usually limits the piezoelectric voltage constant g33 (g33 = d33/εr), a critical figure of merit for piezoelectric sensors.
Xiaoying Feng +7 more
wiley +1 more source
Shuitu Baochi Xuebao, 2002 土壤侵蚀的时空变异是指在一定的景观内 ,不同时间、不同地点的土地侵蚀特征存在明显的差异性和多样性。土壤侵蚀的时空变异是多重尺度上的植被、土地利用、气象 (降雨 )、地形和土壤等多因子综合作用的结果 ,但是就某一具体地区而言存在重点尺度和主控因子 ,土壤侵蚀的重点尺度与主控因子的时空关系因时间、空间和尺度而异 ...
邱扬 傅伯杰 王勇
doaj +2 more sources
Wildlife Letters, Volume 4, Issue 1, Page 10-22, March 2026.In this study we analyze the role of phylogeny, environment, and community structure on sociality. Using structural equation modeling (SEM) we aim to quantify the direct and indirect impacts of variables on behaviors including social grouping, reproduction, and space use among Carnivora species.
Jessica Ward +3 more
wiley +1 more source