Results 11 to 20 of about 683,854 (208)
Shuitu Baochi Xuebao, 2019 为研究间作对土壤侵蚀的调控机制，采用人工模拟降雨方法分析了生育期内玉米马铃薯间作及起垄在不同降雨强度（40，80 mm/h）和坡度（10°，15°）下的降雨入渗规律。结果表明：（1）生育期内同一坡度同一降雨条件下玉米马铃薯间作的降雨入渗结束时间比单作玉米推迟，入渗开始时间差别不明显）玉米马铃薯间作的入渗量高于单作玉米（P0.05）。生育期内40，80 mm/h雨强下间作的入渗量比单作玉米分别增加了25.75%~69.07%和21.76%~50.95%。同一雨强下间作的入渗速率高于单作玉米 ...
欧阳铖人 +3 more
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Wildlife Letters, EarlyView.Using radiotelemetry, we found that the movement and home range of the endangered Sacalia bealei varied significantly across reproductive classes and seasons, with males exhibiting greater movement than females during wet and mating seasons. The species exhibits strong aquatic dependence, favoring deep pools interspaced among riffle‐pool sequences ...
Wing Sing Chan +3 more
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Shuitu Baochi Xuebao, 2007 针对云南山地种植措施不合理、水土资源流失严重的现状，进行了玉米间作蔬菜和草带等不同种植方式对坡耕地水土流失影响的研究。结果表明：8月份玉米间作马铃薯的径流量比玉米裸地单作减少37．4％；7月、8月份玉米间作白菜的土壤侵蚀量比玉米裸地单作分别减少46．7％和58．2％；7，8，9，10月份玉米间作混播草带（处理G）侵蚀量分别比玉米裸地单作显著减少68．9％，74．6％，84．5％和82．1％（P〈0．01）；玉米间作白菜、间作马铃薯、间作辣椒总侵蚀量分别比玉米裸地单作显著减少47．O％，43．8％和10 ...
安瞳昕 +4 more
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Wildlife Letters, EarlyView.Human‐caused leopard deaths in Sri Lanka averaged 9.65 ± 4.5 records year−1 over 17 years (2008–2024; n = 164), with records highly clustered in the central highland mosaic ecosystem. Mortality was dominated by adult males and driven primarily by snaring in plantation landscapes, and indicating an increase approximately 0.7–0.8 deaths per year.
Sanjaya Weerakkody +11 more
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop +8 more
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Shuitu Baochi Xuebao, 2004 采用大容积土培盆栽方法，研究了籽粒苋与烟草间作对烟叶矿质营养元素含量的影响，结果表明：间作烟叶磷的含量比单作降低了21．25％，而氮、钾和硫分别比单作增加了20．23％，63．86％和13．71％，间作烟叶中钾的含量分别是氮、硫的3．16倍和4．66倍；间作烟叶除铜的含量与单作的差异不显著外，其它微量元素含量与单作的差异均达显著或极显著水平，间作烟叶钼和铁的含量较单作分别增加了49．29％和27．39％；间作烟叶的灰分含量也较单作高7．83％；间作烟叶中砷和铬的含量较单作分别降低了15．65％和12 ...
李廷轩 马国瑞
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Organ‐specific ozone and nitrogen legacies strengthen substrate control over litter decomposition
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Elevated tropospheric ozone (O3) and nitrogen (N) deposition are concurrent atmospheric changes that strongly influence terrestrial carbon cycling, yet their combined effects on below‐ground decomposition remain poorly understood.
Xiaofan Hou +8 more
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四川大学学报. 自然科学版, 2005 作为古典KKM定理的推广,Park在他的工作中介绍了G-凸空间和G-KKM映像.最近,Ding介绍了没有任何凸性结构的有限连续拓扑空间(简称FC-空间)的概念,它包含了C-空间(或H-空间)、G-凸空间、L-凸空间等许多具有抽象凸性结构的拓扑空间作为特例,并证明了FC-空间中的KKM型定理.作为改进和推广,作者在FC-空间中讨论了KKM型定理的一些形式,并获得了FC-空间中Ky Fan型sup inf sup形式不等式和一类极大极小不等式.
李红梅
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带电作业人员侵入110kV电缆终端塔间隙方式对套管及应力锥电场分布的影响研究
Dianci bileiqi, 2022 电缆终端套管是电缆线路的薄弱环节，为了掌握带电作业人员不同侵入电缆终端塔间隙的方式对套管及其应力锥电场分布的影响，根据实际110 kV电缆终端搭建仿真模型，因电缆终端塔和应力锥的尺度差异大采用子模型法来优化计算模型，分析了电缆终端正常运行及带电作业人员处于地电位作业、中间电位作业以及等电位作业3种情况对电缆终端应力锥电场分布的影响。计算结果表明：子模型法在保证计算精度的条件下可以有效减少网格数量和缩短计算时间；应力锥在3种作业方式下的电场变化相对于正常运行时均在3.5%以内 ...
吴田 +4 more
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Root activity creates unique microbial hotspots in the rhizosphere by influencing the metabolic activities of surrounding soil microorganisms, profoundly regulating the dynamics of soil organic carbon (SOC). However, how root economic strategies affect the formation and
Qiyu Tan +8 more
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