Results 41 to 50 of about 23,392 (176)

California Renewables Portfolio Standard And Its Experiences For China [PDF]

open access: yes, 2016
在当今能源产业中,发展可再生能源技术,提高可再生能源产业比重是大势所趋。为支持和促进可再生能源发展,美国加州已经制定相对全面的能源政策体系,其中,可再生能源配额制(以下简称为“配额制”)是加州能源政策的重要组成部分。据此,本文从实证角度出发,采用辩证分析方法,探索加州配额制政策历史,充分研究加州配额制政策内容,分析加州配额制的成就与缺憾,并在此基础上为我国配额制的实施建言献策。 本文除引言和结语外,共分为四章。 第一章介绍加州配额制的背景情况。本章首先对配额制的概念、理论基础、 发展情况进行说明 ...
张美玲
core  

Geographic risks to functional groups of mammals and birds from habitat loss in Mexico

open access: yesConservation 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

一株防治花生采后黄曲霉污染的拮抗菌的 筛选及其防控效果Screening of biocontrol bacteria against peanut postharvest Aspergillus flavus contamination and its prevention effect

open access: yesZhongguo youzhi
为预防花生储藏过程中的黄曲霉污染,从农田土中分离出2株拮抗芽孢杆菌,通过平板对峙法优选出1株作为研究对象,研究其对黄曲霉的抑制效果及对花生采后黄曲霉污染的防控效果。采用平板对峙法检测拮抗菌的抑菌广谱性并绘制生长曲线,并通过生理生化实验、形态特征观察及16S rDNA序列分析对该菌株进行鉴定。结果表明:优选出拮抗菌B419作为研究对象,其可有效抑制黄曲霉的生长,在拮抗菌浓度为1.0×106 CFU/mL,黄曲霉孢子浓度为1.0×103 CFU/mL时,黄曲霉孢子萌发抑制率达到98 ...
郑爱芳1,2,3,4, 何欢1, 高晔1, 张名雪1, 王煦1, 赵凯1,2 ZHENG Aifang1,2,3,4, HE Huan1, GAO Ye1, ZHANG Mingxue1, WANG Xu1,ZHAO Kai1,2
doaj   +1 more source

An experimental approach to assess the combined effects of multiple stressors on a large vertebrate species

open access: yesConservation Biology, EarlyView.
Abstract The design of experiments to investigate the combined effects of multiple stressors requires exposing target organisms to multiple combinations of stressor doses. Concurrent manipulation of stressors is often infeasible with wildlife, but long‐lasting health effects allow individual health to be used as an integrator of prior stressor exposure.
Enrico Pirotta   +24 more
wiley   +1 more source

厦门市春夏两季鸟类多样性研究

open access: yes野生动物学报, 2007
通过对代表厦门5种不同生境类型的8个样地进行鸟类调查,共记录到鸟类17目49科242种,占全国鸟类总种数的19.5%,占福建省鸟类总种数的44.7%。与全国鸟类组成相比,厦门鸣禽和涉禽的物种多样性相对比较丰富;比较5种代表性的生境鸟类多样性,农田物种多样性最丰富(Shannon-Wiener指数H′=5.549 63),但是其科属多样性却最低(G-F指数DFG=0.53568);森林生境中科属多样性最高(G-F指数D(FG)=0.872282),特别是科多样性显著高于其他生境(F指数DF=15.8911)
邱春荣
doaj  

Effects of landscape context on avian specialist response to increased surface temperature in protected areas

open access: yesConservation Biology, EarlyView.
Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge   +2 more
wiley   +1 more source

Study on latitudinal gradient of species diversity in forest communities [PDF]

open access: yes, 2015
森林群落结构和物种多样性的空间分异规律一直是生态学研究的热点问题。近年来,关于森林群落结构的描述与物种多样性的测定方法等研究也都有所发展,但这些研究大多是对森林生态系统的定性描述,而且方法不一,数据之间也缺乏可比性。 群落的组成结构是群落的重要标志,研究群落结构是研究群落物种多样性意义的理论基础,所以从群落组成结构的角度来探讨生物群落的物种多样性具有重要的意义,为进一步深入研究生物多样性功能及确定功能群提供理论基础 ...
孙影
core  

Calibration of the species threat abatement and restoration metric's threat abatement component in a Costa Rican landscape

open access: yesConservation Biology, EarlyView.
Abstract Achieving global conservation policy goals requires the ability to set and measure progress toward science‐based targets for biodiversity. The species threat abatement and restoration (STAR) metric was developed to enable actors to set science‐based targets for species.
Louise Mair   +17 more
wiley   +1 more source

威海市斑块冬季鸟类多样性与生境的关系

open access: yes野生动物学报, 2012
近年来,威海一直致力于生态城市的建设。物种多样性是生态城市的重要指标,而在物种多样性中,城市鸟类多样性起着重要的作用。本文调查了冬季威海7个斑块(2个校园和5个典型生活小区)的鸟类多样性,对其物种多样性指数以及均匀度指数进行分析,得出山东大学校园和哈尔滨工业大学校园的鸟类多样性高于5个小区斑块,而且2个校园斑块的均匀度在7个斑块中也处于较高水平。另外,结合实际情况,文章从绿化面积、城市栖息地的空间异质性、生境破碎化程度以及人为干扰4个方面对城市鸟类丰富度与多样性的影响因素做出讨论 ...
高伟   +5 more
doaj  

用Biolog-ECO板分析动物笼舍环境微生物

open access: yes野生动物学报, 2021
为了解动物园动物笼舍环境微生物活性及其影响因素,采集了5种灵长动物(Primates)、3种爬行动物(Reptilia)笼舍的3种不同类型的环境样本共15个,采用BiologECO板进行微生物分析。结果表明:15个样本的微生物活性存在极显著差异 ...
王兴金萨家祺李冠惠黎绘宏成世清
doaj  

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