Results 11 to 20 of about 686,199 (178)
Wildlife Letters, EarlyView.The study explores how beavers (Castor spp.) affect endangered freshwater pearl mussels (Margaritifera margaritifera) in European rivers. Beaver dams can harm small, fragmented mussel populations by reducing flow, increasing sediment, and potentially limiting host fish movement, while larger populations may benefit from improved bed stability and ...
Louise Lavictoire +2 more
wiley +1 more source
, 2010 根据石河子地区4个区域(石河子市,莫索湾垦区,下野地垦区,安集海垦区)1959-2006年的年均降水量资料,利用Mann-Kendall秩次相关检验和时间序列的线性趋势检验得到:石河子地区的年际降水量总体呈上升趋势,但该趋势在0.05水平上不显著;通过Morlet小波变换对石河子地区降水量进行了多时间尺度的周期性变化分析和趋势预测,结果表明:石河子市,安集海,下野地,莫索湾垦区分别在15a,16a,14a,16a的中心时间尺度上存在约4个主周期,6a,5a,6a,6a的时间尺度上存在约9个次周期 ...
徐海量, 凌红波, 史薇
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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
wiley +1 more source
叶尔羌河年径流量与降水量的集中性及相关性分析/Analysis on Concentration and Correlation of Runoff and Precipitation in the Yarkand River Basin[J] [PDF]
, 2012 利用叶尔羌河源流区近50a的逐月降水量与径流量资料,借助非参数检验、小波分析等方法研究了叶尔羌河年径流量与降水量的集中性及多时间尺度相关关系。结果表明：①叶尔羌河径流量在冬半年增加显著并在1993年发生明显的突变,而降水量在全年呈显著的增加且突变点在1986年。②叶尔羌河径流量与降水量集中度指数在总体上皆呈不显著的减少。③叶尔羌河径流量的集中度指数存在3、11a和16a的周期变化,而降水量集中度指数存在3、7a和14a显著周期性。④叶尔羌河6 ...
中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室,新疆乌鲁木齐830011 中国科学院研究生院,北京100049 +7 more
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, 2017 利用野外模拟降雨试验，研究了粗质地土壤裸地和苜蓿地在不同坡度（ ５° ， １５° ， ２５° ）、不同前期含水量 （低、中、高）条件下坡面降雨产流、产沙的过程及其特征，以此探究该区退耕还草效益。结果表明： ３ 种坡度 条件下裸地和苜蓿地的产流过程在不同前期含水量下均为先增大后趋于稳定，不同坡度之间的径流量差 异不显著，但泥沙流失量随着坡度的增大而显著增加，在降雨过程中先增大达到峰值趋于稳定波动，裸地 的波动幅度大于苜蓿地。 ２ ...
游微, 樊军
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Drylands are mainly structured by both vascular plants and biological soil crusts (biocrusts), the latter often regarded as a self‐organizing component of these ecosystems.
Haoran Luo +13 more
wiley +1 more source
, 2007 建立了反相高效液相色谱法测定废水降解过程中2,4,6-三氯苯酚含量的方法。采用Kromasil C18色谱柱 (250×4.6 mm)，流动相为V (甲醇含1%醋酸):V(水含1%醋酸) = 80:20，流速为1.0mL/min，紫外检测器检测波长为290 nm，加标回收率为98.5% ~ 102.9%，相对标准偏差小于1.5%。，该方法准确快速，重现性好 ...
付冬梅 +6 more
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Multi‐gradient warming reshapes functional traits and adaptive responses of alpine meadow plants
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant functional traits in alpine meadows are critical indicators of ecosystem responses to climate warming, yet dynamic changes in trait networks across warming gradients and their consequences for community functions remain poorly understood.
Zhiwei Yan +6 more
wiley +1 more source
, 2016 降水是全球水分和能量循环中关键的气候要素。降水量是水分循环、水资源评价、气候分析、水文模型等计算和研究中非常重要的输入参数。因此获得高分辨率、高精度的降水数据具有重要的意义。在我国西部地区，尤其是地势复杂，海拔较高的天山山区，水文气象观测站点稀少，站网密度远远不能满足流域水文模型的应用需求。目前，遥感技术可以提供在空间上连续分布的降水资料，其中TRMM遥感数据应用广泛，已成为研究降雨变化的一种重要手段。但其空间分辨率较低，数据精度相对不高，对遥感降水数据进行降尺度和校正，能够有效解决该问题 ...
李慧
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Habitat and spatial trends of U.K. wintering waterbird populations over 50 years
Conservation Biology, EarlyView.Abstract The United Kingdom is an important wintering ground for millions of waterbirds. Most U.K. wintering waterbird populations increased between 1970 and the mid‐1990s, but declined thereafter. We examined U.K. population indices in 46 wintering waterbird species in two 25‐year periods, 1970–1994 and 1995–2019, to identify which waterbird groups ...
Blaise Martay +8 more
wiley +1 more source