Results 31 to 40 of about 24,941 (203)
Response of Avicennia marina rhizosphere to arsenic stress and arsenic accumulation and distribution in plants [PDF]
, 2016 红树林是生长在热带、亚热带河口海湾地区的木本植物群落，具有极高的生态价值和经济价值，但红树林湿地由于其独特的生境特征及强烈的人为干扰，面临着日益严重的重金属污染问题。其中，砷（As）由于具有强烈的致癌作用且影响植物正常新陈代谢，成为近几年红树林污染生态学研究的重要内容。目前，红树林As污染的研究主要集中于As在红树林湿地系统中的空间分布、生态风险评估以及As在沉积物中的赋存状态三个方面，有关As胁迫下红树植物的响应机制及红树植物生长对沉积环境中As迁移转化的影响鲜有报道 ...
范缙
core
Conservation Biology, EarlyView.Abstract The Natura 2000 (N2K) network of protected areas is one of the main tools for area‐based conservation in the European Union (EU), yet its role in preserving plant biodiversity requires better understanding. We examined data kept in the European Vegetation Archive from over 1.2 million vegetation plots and obtained over 14.2 million plant ...
Michele Di Musciano +41 more
wiley +1 more source
土壤呼吸作用时空动态变化及其影响机制研究与展望. [PDF]
, 2009 测定不同陆地生态系统土壤呼吸速率及其时空波动,阐明其影响因子,对于全球碳素平衡预算和全球变化潜在效应估计是最为基本的数据。然而,有关土壤呼吸作用变异性及其影响因素的知识仍存在局限性,一些关键的过程和机制还有待阐明。该文综述了近年来土壤呼吸作用时空动态规律、影响机制和模拟方面的研究进展,指出环境因子和生物因子共同驱动着土壤呼吸作用的时间动态变化;土壤呼吸作用在不同时间尺度上还具有明显的空间异质性,这主要是植被覆盖、根系分布、主要的环境因素和土壤特性空间分布的异质性造成的 ...
周广胜., 韩广轩
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In vitro culture, cryopreservation, and field reintroduction of the endangered Mingan thistle
Conservation Biology, EarlyView.Abstract Current plant conservation efforts are hindered by, for example, poor seed germination, low viability, and insufficient propagation and preservation technologies. To address these problems, we devised an approach to plant conservation that integrates conservation, preservation, and restoration (CPR), which uses advanced in vitro techniques. We
Mukund R. Shukla +4 more
wiley +1 more source
Shuitu Baochi Xuebao, 2011 为探讨土壤分离过程的水动力机理及植被根系对土壤分离的抑制作用,采用变坡实验水槽,系统研究坡度、流量及根系对土壤分离速率的定量影响。结果表明,土壤分离速率是坡度、流量及根系密度的函数;植被根系能显著降低土壤分离速率,草地土壤分离速率均值仅为休闲对照地的30.6%;随根系密度增加,土壤分离速率呈指数关系下降;0～4 kg/m3为根系减少土壤分离的有效密度区间,在此范围内,根系密度的增加能引起土壤分离速率的急剧降低,超过4 kg/m3,随根系密度增加,土壤分离速率的降幅并不明显。
唐科明 +3 more
doaj
Effects of Simulated Sea Level Rise on Storage and Origins of Sediment Organic Carbon and Decomposition of Fine Roots in Kandelia obovata Mangrove Ecosystem [PDF]
, 2016 本研究以厦门曾营海岸三个不同高程样地的秋茄（Kandeliaobovata，以前学名为Kandeliacandel）红树林为研究对象。在模拟海平面上升80cm红树林（SLR80cm）、模拟海平面上升40cm红树林（SLR40cm）以及对照红树林（SLR0cm，相当于福建九龙江口红树林的滩面高程），探讨海平面上升对秋茄红树林生态系统地下部分有机碳过程的影响。 随海平面高度的增加，秋茄红树林底质有机碳和活性有机碳含量均逐渐增加；随着深度的增加，三块样地的底质有机碳含量、TN含量及C/N呈现逐渐减少的趋势 ...
黄莺莺
core
Distribution, scale, and drivers of mass mortality events in Europe's freshwater bivalves
Conservation Biology, EarlyView.Abstract Mass mortality events (MMEs) are decimating populations and compromising key ecosystem functions around the globe. One taxon particularly vulnerable to MMEs is freshwater bivalve mollusks. This group has important ecosystem engineering capacities and includes highly threatened and highly invasive taxa.
Daniel A. Cossey +39 more
wiley +1 more source
Geographic risks to functional groups of mammals and birds from habitat loss in Mexico
Conservation Biology, EarlyView.Abstract There is a need to quantify the impact of habitat loss due to anthropogenic factors on different aspects of biodiversity, such as functional trait diversity represented by functional groups (FGs). We developed a metric to assess the weighted risk of loss of habitat for 33 FGs of mammals and 36 FGs of birds in Mexico based on potential ...
Fernando Mayani‐Parás +4 more
wiley +1 more source
Shuitu Baochi Xuebao, 2004 以干旱区绿洲农田冬小麦水分胁迫试验为基础,研究了不同水分胁迫条件下的冬小麦生长发育、水分利用以及土壤水分运动特征,建立了含有根系吸水项的一维土壤水动力学模型,模拟了不同水分胁迫条件下冬小麦蒸腾、棵间蒸发、根系吸水、根系生长以及田间土壤水分运移过程。结果表明:在冬小麦生育前期、中期根系吸水主要在80cm以上,生育后期根系对下层土壤水分吸收量增加,但所占比例很小。根据实测根系生长资料分析水分胁迫下生育中期根系受到水分胁迫,在生育后期恢复灌水后根系早衰,生长缓慢 ...
盛钰 赵成义 蒋平安 贾宏涛
doaj +2 more sources
Conservation Biology, EarlyView.Abstract There exists a growing suite of technologies that support significant and exciting progress in biodiversity conservation and research. Citizen scientist participation is common in this research and often focuses on data collection and labeling.
Joycelyn Longdon +5 more
wiley +1 more source