Results 41 to 50 of about 2,230 (137)

Moving beyond the pathology of policies pushing species toward extinction: The case of spectacled flying foxes in Australia 摆脱将物种推向灭绝的政策症候——以澳大利亚眼镜狐蝠为例

open access: yesIntegrative Conservation, Volume 3, Issue 2, Page 87-103, June 2024.
Some extinctions can be prevented if impediments to protection of threatened species are overcome. Policies and practices have failed endangered species and biodiversity conservation is fraught with impediments such as rhetorical adoption, policy dismantling, circumvention of legislative obligations, and deliberate ignorance of scientific evidence ...
Noel Preece   +2 more
wiley   +1 more source

More problems sampling wildlife with baits: Environmental food resources influence trapping rates 使用诱饵进行野生动物采样的若干问题:环境中的食物资源会影响诱捕率

open access: yesWildlife Letters, Volume 2, Issue 2, Page 83-89, June 2024.
In this study, we show that environmental food availability influences wildlife detection probability when using food baits. We sampled small mammals in Borneo with live traps baited with fruit before, during and after the rainforest experienced a mast fruiting event, which drastically altered environmental food availability.
Bastien Dehaudt   +3 more
wiley   +1 more source

下垫面变化对喀斯特坡地地下产流产沙的影响

open access: yesShuitu Baochi Xuebao, 2018
通过人工模拟降雨试验,探索表土剥离对喀斯特坡耕地侵蚀产沙的影响。采用钢槽装填土石模拟喀斯特坡地的“二元结构”。通过正交试验分析了下垫面类型(坡耕地、裸坡地)、雨强(0.5,0.8,1.3 mm/min)和地下孔(裂)隙度(1%,2%,3%,4%,5%)对坡地地下产流、产沙的影响。结果表明:表土剥离导致下垫面土壤物理性质改变,是影响坡地产流、产沙特征变化的主要因素。降雨强度主要影响坡地地下产流量和产沙量,地下孔(裂)隙度主要影响径流和泥沙在地表和地下的分配比例 ...
严友进, 杨
doaj  

Influence of interactive effects on long‐term population trajectories in multispecies reintroductions

open access: yesConservation Biology, Volume 38, Issue 3, June 2024.
Abstract Reintroduced populations are typically considered to progress through establishment, growth, and regulatory phases. However, most reintroduction programs do not monitor intensively enough to test this conceptual model. We studied population indices derived from track activity of 4 threatened species (greater bilby [Macrotis lagotis], burrowing
Katherine E. Moseby   +3 more
wiley   +1 more source

Ecology, status, and distribution of Temminck's pangolin (Smutsia temminckii) in Hwange National Park 万基国家公园南非地穿山甲 (Smutsia temminckii) 的生态、现状和分布

open access: yesWildlife Letters, Volume 2, Issue 1, Page 17-22, March 2024.
Temminck's pangolin faces conservation threats, mainly habitat fragmentation, poaching, and trafficking. The study assessed the ecology, status, and distribution of Temminck's pangolin in Hwange National Park and directly sighted seven specimens. Biotic and abiotic factors influence pangolin distribution inside and outside protected areas.
Kelly Sabashau   +4 more
wiley   +1 more source

降雨强度和坡度对裸露铁尾矿砂坡面产流产沙的影响

open access: yesShuitu Baochi Xuebao, 2019
采用室内人工模拟降雨技术,研究短历时暴雨和坡度对裸露铁尾矿砂坡面产流产沙的影响。结果表明:(1)不同降雨强度条件下,不同坡度间的坡面径流量、产沙量及径流泥沙含量均呈现随着降雨历时的增加而增加的动态变化趋势,不同的是径流量在15~24 min后逐渐趋于稳定。(2)不同降雨强度条件下,裸露铁尾矿砂坡面径流量及产沙量与坡度相关关系均存在临界降雨强度,该临界降雨强度约为90 mm/h。(3)不同降雨强度条件下,不同坡度间的产沙量及径流泥沙含量随着降雨强度的增加,二者与坡度的关系均由负相关逐渐转变为正相关。(4 ...
郭星星   +4 more
doaj  

短历时强降雨对典型喀斯特坡耕地侵蚀产沙的影响

open access: yesShuitu Baochi Xuebao, 2019
探索短历时强降雨对典型喀斯特坡耕地侵蚀产沙的影响,为喀斯特区坡耕地应对极端天气的水土流失防治提供理论依据。研究采用人工室内模拟降雨试验的方法,对喀斯特坡耕地侵蚀产沙特征在短历时强降雨作用下的影响因素开展研究。结果表明:(1)短历时强降雨导致喀斯特坡耕地地表输沙模数和产沙量随降雨强度的增大而增大,而地下输沙模数和产沙量与降雨强度无明显变化规律,坡耕地土壤侵蚀以地表为主。地表产沙临界雨强为30~50 mm/h。(2)坡度增大时地表产沙比重大于地下产沙比重,地表土壤侵蚀以地表为主 ...
任青青   +6 more
doaj  

雨强及施肥降雨间隔对油菜田氮素径流流失的影响

open access: yesShuitu Baochi Xuebao, 2006
利用室内模拟降雨和原状土盆栽的方法。研究了3个不同降雨强度条件下降雨施肥间隔对杭嘉湖平原区油菜田氮紊径流流失的影响。结果表明:在同一降雨强度下,降雨施肥间隔与总氮输出浓度呈负相关关系。而同一降雨施肥间隔下。雨强与径流氮浓度呈正相关关系.但即使在低雨强下.短降雨施肥间隔仍可导致大量氮紊流失;径流氮素输出动态过程可以分为前期浓度出峰期和后期浓度下降稳定期,径流氮浓度的输出风险主要集中在前期出峰期,低雨强的稳定期出现时间较早;硝氮是氮索流失的主要形态,各处理条件下硝氮比重均在30%以上 ...
梁新强   +4 more
doaj   +2 more sources

雨强和坡度对嵌套砾石红壤坡面产流产沙的影响

open access: yesShuitu Baochi Xuebao, 2018
采用人工模拟降雨的方法研究了嵌套砾石红壤坡面的产流产沙特征,分析了雨强(60,120 mm/h)和坡度(10°,15°,20°,25°)条件下嵌套砾石和无砾石红壤坡面的产流和产沙过程差异。结果表明:(1)产流开始时间T嵌套砾石 < T无砾石,60 mm/h雨强条件下嵌套砾石较无砾石坡面在10°,15°,20°,25°坡度分别延迟4.20,2.95,2.23,1.03 min;(2)坡度相同时,嵌套砾石坡面较无砾石坡面产流率明显减少,但雨强的增大会掩盖嵌套砾石对坡面产流率减小的影响;(3 ...
王蕙, 胡秀君, 山成菊
doaj  

(土娄)土坡面降雨水沙运移实验研究

open access: yesShuitu Baochi Xuebao, 2007
黄土高原是我国植被破坏与水土流失最为严重的地区。本文基于室内坡地降雨实验,分析了塿土坡面降雨入渗补给系数的变化,对比了不同雨强影响下径流泥沙含量和累积泥沙含量的时间变化趋势,并将侵蚀与入渗结合,分析了同时段产沙量和入渗率的变化关系,研究表明:入渗补给系数随雨强增大而逐渐减小,两者可描述为线性关系,雨强越小,入渗补给系数越高;降雨初始产沙值最大,在产沙10 min内变缓。雨强大的,初始产沙量和稳定沙量都稍大,但总体差异不大,产沙量分布曲线形状与入渗率曲线极为相似 ...
李毅, 邵明安
doaj  

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