Results 1 to 10 of about 104,057 (146)

Identifying socioeconomic and biophysical factors driving forest loss in protected areas

open access: yesConservation Biology, Volume 37, Issue 4, August 2023., 2023
Abstract Protected areas (PAs) are a commonly used strategy to confront forest conversion and biodiversity loss. Although determining drivers of forest loss is central to conservation success, understanding of them is limited by conventional modeling assumptions.
Kathryn A. Powlen   +3 more
wiley   +1 more source

A spatially explicit empirical model of structural development processes in natural forests based on climate and topography

open access: yesConservation Biology, Volume 34, Issue 1, Page 194-206, February 2020., 2020
Abstract Stand structure develops with stand age. Old‐growth forests with well‐developed stand structure support many species. However, development rates of stand structure likely vary with climate and topography. We modeled structural development of 4 key stand variables and a composite old‐growth index as functions of climatic and topographic ...
Yuichi Yamaura   +6 more
wiley   +1 more source

乌拉山废弃矿区坡长对客土坡面产流产沙与沟蚀特征的影响

open access: yesShuitu Baochi Xuebao, 2022
为研究不同坡长客土坡面产流产沙及沟蚀特征差异变化,通过设计2个坡度(15°,20°)下不同坡长(2,4,6,8,10 m)的野外径流小区进行冲刷试验。结果表明:(1)初始产流时间变化范围与产流停止时间均随坡长增加而增大,产流率初期快速增加,达到初次峰值后呈现不规律波动,累积产流量随坡长增加而增多;产流率、累积产流量与坡长、产流时间及其交互作用呈极显著相关(p<0.01),累积产流量在2种坡度下均与坡长、产流时间呈幂函数相关。(2)产沙率初期快速增加,达到初次峰值后随冲刷时间逐渐下降 ...
张馨予   +6 more
doaj  

翻耕除草对不同坡长下紫色土氮磷流失的影响

open access: yesShuitu Baochi Xuebao, 2020
为揭示自然降雨下翻耕除草和坡长对紫色土氮、磷流失的影响,通过野外设置径流小区(2个坡面:翻耕除草与自然恢复;3种坡长:20,40,60 m,共9个小区),定位监测研究不同处理下产流产沙及氮、磷流失特征。结果表明,同一坡面不同坡长间产流产沙差异不显著(P>0.05);同一坡长不同坡面处理小区的径流量、产沙量差异极显著(P0.05),其他坡长DN、DP流失量差异显著 ...
梁珂   +4 more
doaj  

基于无人机航摄的坡形对浅沟发育的影响

open access: yesShuitu Baochi Xuebao, 2022
为探究坡形对浅沟发育的影响,以陕西省靖边县狼儿子沟无人机航摄影像为基础数据,通过目视解译得到浅沟(指瓦背状地形底部)225条,统计了浅沟条数、浅沟长度、沟头到分水岭的距离及浅沟密度等指标。利用浅沟地形分水线上的高程点进行插值得到原始坡面数字高程模型(digital elevation model,DEM),以此DEM提取地形曲率以表征坡形,进而分析坡形与浅沟指标的关系。结果表明:(1)以浅沟地形分水线上的高程点插值后的DEM对浅沟进行了综合,能较好地表达浅沟发育之前原始坡面的地形特征。(2 ...
王海于   +4 more
doaj  

Context‐Dependent Effects of Beavers (Castor spp.) on Freshwater Pearl Mussels (Margaritifera margaritifera) in European Rivers 河狸对欧洲河流中的淡水珍珠贝 (Margaritifera margaritifera) 存在情境依赖性影响

open access: yesWildlife 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

不同立地条件下沙棘土壤水分分布特征及动态生长研究

open access: yesShuitu Baochi Xuebao, 2022
为探究不同立地条件下沙棘土壤水分分布特征和生长情况,采用样地试验,设置2种坡向(阴坡、阳坡)和3种坡位(坡顶、坡中、坡底)进行研究。研究表明:(1)各样地内的土壤水分季节变化可划分为消耗期(5—6月)、快速补充期(6—7月)和消退期(7—9月),天然降水对土壤含水率影响较大;(2)各样地内的土壤水分垂直分布为土壤水分显著变化层(Cv>0.2)、土壤水分次变化层(0.2>Cv>0.1)和土壤水分相对稳定层(Cv阳坡,不同坡位表现为坡底>坡中>坡顶。研究结果可为玛纳斯县前山地带沙棘造林提供参考和理论依据。
闵梓骁   +5 more
doaj  

Achieving Transboundary Water Security Through Water Innovations: A Framework and Cases

open access: yesWorld Water Policy, Volume 12, Issue 1, February 2026.
ABSTRACT Alternative sources of freshwater, provided by various innovations, have long been available to countries facing acute water stress. We hypothesize that avoiding and/or resolving conflict with neighbors—caused by the uncertainty of continued access to shared surface water and groundwater sources—is another driver of innovation adoption ...
David Lewis Feldman
wiley   +1 more source

Indian Pangolin in Lamjung Requires Urgent Attention 尼泊尔拉姆琼县地区的印度穿山甲急需关注

open access: yesWildlife Letters, Volume 2, Issue 4, Page 204-213, December 2024.
This study documented the first evidence of the Indian pangolin in Lamjung district, Nepal, finding three burrows and rescue evidence in Simalchaur Naringhat Community Forest. The burrows identified at an elevation of 530 m and characterized by moderate crown and ground cover (26%–50%), a 25° slope, and predominantly red soil, are indicative of a ...
Asmit Neupane   +4 more
wiley   +1 more source

Patterns of recovery in extant and extirpated seabirds after the world's largest multipredator eradication

open access: yesConservation Biology, Volume 38, Issue 4, August 2024.
Abstract Eradicating invasive predators from islands can result in substantial recovery of seabirds, but the mechanisms that drive population changes remain poorly understood. Meta‐analyses have recently revealed that immigration is surprisingly important to the recovery of philopatric seabirds, but it is not known whether dispersal and philopatry ...
Jeremy P. Bird   +2 more
wiley   +1 more source

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