Results 31 to 40 of about 1,623 (116)

不同雨型下紫色土区坡耕地产流产沙特征

open access: yesShuitu Baochi Xuebao, 2017
利用遂宁水土保持试验站5个径流小区1984—2015年次降雨和径流输沙数据,基于降雨过程定量划分出4种雨型,分析了雨型对不同坡度坡耕地产流产沙的作用。结果表明:径流深与各时段最大雨强均呈极显著相关(p<0.01),随着坡度的增加,最大相关系数所对应的雨强时段越短;冲刷量均与I平均呈极显著相关,且相关系数最大。径流深、冲刷量与雨强拟合关系均为幂函数,分别为“凸型”和“凹型”增函数,且拟合度区间分别为[0.79,0.88]和[0.90,0.97],说明冲刷量和雨强的关系更密切 ...
马, 陈, 单志杰, 郎登潇, 廖
doaj  

State infrastructural power in a neopatrimonialist democratization context: Why Tunisian sustainable land management fails

open access: yesReview of Policy Research, Volume 41, Issue 6, Page 985-1016, November 2024.
Abstract Sustaining agricultural production in arid and semi‐arid regions is of paramount importance to food security, geo‐political independence, and social stability. In this context, it is vital to understand the effectiveness of policies. In this article, we aim to answer the question of what role the state and its policies play for soil protection
Andreas Thiel   +3 more
wiley   +1 more source

辽宁棕壤区开发建设项目弃土流失特征研究

open access: yesShuitu Baochi Xuebao, 2011
弃土场是开发建设项目中最重要的水土流失来源之一。以辽宁省沈阳市某电厂剥离表土临时堆土为对象,研究棕壤地区开发建项目设弃土的流失规律。试验在沈阳农业大学水利学院综合试验基地的人工模拟降雨试验大厅内进行,共设5个雨强、5个坡度,雨强分别为0.38,0.64,1.05,1.24,1.50 mm/min,坡度分别设定为20°,25°,30°,35°,40°。研究结果表明,相同条件下,雨强越大坡面产流时间越短,坡面土壤水分入渗率随雨强的增加而增加,且雨强越大坡面初始入渗率越高;径流量随雨强的增加而增加 ...
苏芳莉   +4 more
doaj  

A prospective study evaluating the correlation between local weather conditions, pollen counts and pruritus of dogs with atopic dermatitis

open access: yesVeterinary Dermatology, Volume 35, Issue 5, Page 500-507, October 2024.
Abstract Background Canine atopic dermatitis (cAD) is a hereditary, generally pruritic and predominantly T‐cell‐driven inflammatory skin disease, involving an interplay between skin barrier abnormalities, allergen sensitisation and microbial dysbiosis.
L. Widorn   +2 more
wiley   +1 more source

Demographic and net primary productivity dynamics of primary and secondary tropical forests in Southwest China under a changing climate 气候变化背景下中国西南热带原始林和次生林的群落和净初级生产力动态研究

open access: yesIntegrative Conservation, Volume 3, Issue 3, Page 230-243, September 2024.
Tropical secondary forest at early sucessional stage had higher diamter growth rate and mortality rate, however, these forests also are more risked to droughts and high temperatures. Rising temperatures and more frequent droughts may decrease the carbon sink capacity of tropical forest ecosystems. Abstract Tropical forests are major carbon sinks on the
Sai Tun Tun Oo   +11 more
wiley   +1 more source

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

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

嵌套砾石红壤坡面壤中流对降雨强度的响应

open access: yesShuitu Baochi Xuebao, 2019
为研究嵌套砾石红壤坡面的壤中流动态过程及降雨产流分配,以红壤缓坡(10°)和陡坡(25°)坡面为研究对象,采用室内人工模拟降雨的方法研究不同降雨强度(60,90,120 mm/h)和不同砾石含量(0,10%,20%,30%)条件下壤中流的初始产流时间、产流速率和径流过程。结果表明:(1)不同含量砾石嵌套红壤坡面壤中流初始产流时间在雨强60 mm/h时接近15 min,在雨强90,120 mm/h时差别较大)雨强从60 mm/h增大到120 mm/h ...
王蕙, 卢德宝, 徐铭泽
doaj  

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