Results 21 to 30 of about 3,918 (154)

Global drivers of the conservation–invasion paradox

open access: yesConservation Biology, Volume 39, Issue 5, October 2025.
Abstract The conservation–invasion paradox (CIP) refers to a long‐term phenomenon wherein species threatened in their native range can sustain viable populations when introduced to other regions. Understanding the drivers of CIP is helpful for conserving threatened species and managing invasive species, which is unfortunately still lacking. We compiled
Yanhua Hong, Zhiyong Yuan, Xuan Liu
wiley   +1 more source

Dry and Wet Deposition Characteristics and Anthropogenic Sources of Atmospheric Mercury in Xiamen [PDF]

open access: yes, 2016
大气汞是危害人体健康的毒性污染物。大气中不同形态的汞具有不同的理化特性,颗粒态总汞TPM(Totalparticulatemercury)沉降速率高,能在排放源附近沉降,对区域内的生态环境造成较大的危害;大气气态总汞TGM(Totalgaseousmercury)因其具有较低的水溶性和沉降速率,可在大气中停留0.5-2年,能够进行长距离传输,被认为是全球性污染物。目前欧美地区已经广泛地建立起汞监测网络,虽然国内的大气汞监测也陆续开展起来,但是长时间持续监测尚不多见。本研究基于实验室前期的研究成果 ...
陈强
core  

Assessing the Corn Belt as an anthropogenic barrier to migrating landbirds in the United States

open access: yesConservation Biology, Volume 39, Issue 5, October 2025.
Abstract Migrating landbirds adjust their flight and stopover behaviors to efficiently cross inhospitable geographies, such as the Gulf of Mexico and the Sahara Desert. In addition to these natural barriers, birds may increasingly encounter anthropogenic barriers created by large‐scale changes in land use. One such barrier could be the Corn Belt in the
Fengyi Guo   +7 more
wiley   +1 more source

On the normative roles of biodiversity and naturalness in conservation

open access: yesConservation Biology, Volume 39, Issue 5, October 2025.
Abstract Nature is an opaque concept. Consequently, the term biodiversity conservation has replaced nature conservation in most conservation contexts. We review the conceptual indeterminacies that plague the terms nature and natural but then show that comparable difficulties plague biodiversity.
David Saltz, Shlomo Cohen
wiley   +1 more source

Multiple global change factors alter the scaling of nitrogen to phosphorus in alpine plants

open access: yesFunctional Ecology, Volume 39, Issue 8, Page 2044-2055, August 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometry and allometry of nitrogen (N) and phosphorus (P) reflect nutrient absorption and dynamic allocation by plants, and can be regulated by global change factors (e.g. nitrogen enrichment, climate warming and altered precipitation). Yet, how multiple global
Jiapu Li   +10 more
wiley   +1 more source

Water use characteristics of two Sonneratia mangrove species [PDF]

open access: yes, 2017
红树林生长在热带、亚热带海岸潮间带。虽然海水充沛,但高盐度的海水使得土壤孔隙水水势极低,这在很大程度上限制了红树植物对水分的吸收,造成红树植物生理干旱的现象。红树植物大都采取了相同的水分利用策略,就是在节约用水的同时,最大程度地吸收水分。对红树植物的水分利用特征的研究是认识红树植物适应潮间带高盐及淹水胁迫的关键。本研究利用热扩散式茎流仪和微型气象站,在2015–2016年期间对深圳福田红树林自然保护区(22°31'N,114°0'E)内的两种同龄的海桑属红树植物,无瓣海桑 ...
赵何伟
core  

Slope Aspect Differentiation of Pisha Sandstone Slide Erosion and Its Response to Meteorological Factors [PDF]

open access: yes
[Objective] As a typical mode of gravity erosion in the Pisha sandstone area, debris sliding has become a significant source of coarse sand material within gullies, seriously threatening the ecological security of the basin.
LI Long   +4 more
core   +1 more source

最小二乘支持向量机预测绝缘子等值附盐密度

open access: yesGaoya dianqi, 2008
考虑到气象因子条件对绝缘子的等值附盐密度影响复杂,难以建立精确数学模型等问题,提出了一种最小二乘支持向量机的绝缘子在一定的气象因子条件下的等值附盐密度预测新模型。以温度、湿度、风速等主要气象因子为输入,绝缘子等值附盐密度为输出,通过最小二乘支持向量机模型,拟合输入与输出之间的复杂非线性函数关系。以现场采集的气候数据为样本对模型进行学习训练,用训练好模型预测绝缘子在一定气候条件下的等值附盐密度。实践表明该方法具有建模速度快、预测精度高、操作简便等优点,不仅克服了常规的BP预测模型的不足 ...
舒服华, 张望祥
doaj  

Litter and Caloric Value of Casuarina equisetifolia Plantation in Coastal Sandy Area [PDF]

open access: yes, 2007
采用定位研究的方法,在福建惠安赤湖防护林场定期收集木麻黄林分的凋落物,开展凋落物的归还量和热值的研究.结果表明,木麻黄林凋落物年归还量为14.17thm-2a-1,小枝占总归还量的72.19%,其他各组分占27.81%.凋落物灰分含量小枝4.39%~5.65%,枝条3.52%~5.65%,球果2.63%~4.23%;凋落物干重热值为小枝20.51~21.68kJ/g,枝条19.63~20.21kJ/g,球果18.27~20.63kJ/g;凋落物去灰分热值为小枝21.48~22.69kJ/g,枝条21 ...
卢昌义   +3 more
core  

古尔班通古特沙漠人工林土壤水分及其影响因素 [PDF]

open access: yes, 2009
通过2004年2~12月对古尔班通古特沙漠南缘2年生人工梭梭和沙拐枣混交林内3条典型坡面土壤水分进行了系统监测与研究。结果表明:人工林土壤水分状况受季节性降水、人工林种植密度、地形因子的影响而出现明显的时空分异。在空间上将土壤水分变化划分为三层,0~30cm为活跃层,30~60 cm为次活跃层,60~120 cm为相对稳定层。通过主成分分析,得出地形因子、种植密度对0~30 cm土层土壤水分的影响次序为坡度>坡向>种植密度>高程,30~60 cm土层为坡向>种植密度>坡度>高程,60~120 ...
付恒飞, 宋春武, 蒋进, 陈钧杰
core  

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