Results 41 to 50 of about 16,842 (206)

Vulnerability Assessment of Coastal Zone in China under the Background of Climate Change [PDF]

open access: yes, 2015
气候变化与自然和人类社会系统有着密不可分的关系。气候变化所引起的极端天气、海平面上升、冰川消融、生态系统破坏、旱涝灾害等给自然生态系统和社会经济系统平衡带来了严峻的挑战,严重的威胁着人类的生命财产安全。研究分析中国海岸带脆弱性,对完善我国海岸带脆弱性评估方法和指标体系,对我国海岸带管理及制定应对气候变化的战略决策具有重要的现实意义和学术价值。本论文对海岸带脆弱性评估理论进行了系统研究,在此基础上建立了海岸带脆弱性评估的方法和指标体系,并利用InVEST模型和ArcGIS软件对中国海岸带脆弱性进行了评估 ...
孙晓萌
core  

Anthropogenic nitrogen addition interrupts seasonal connectivity and structures of plant–pollinator networks

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Ecological communities are stressed by rapid and complex anthropogenic changes, threatening the persistence of biotic interactions and ecosystem functioning. Plant–pollinator communities, for instance, undergo structural transformations as a result of land‐use change ...
Erliang Gao   +8 more
wiley   +1 more source

广东中山水栖寡毛类区系调查 [PDF]

open access: yes, 2008
中山市位于珠江三角洲中南部,区内分布江河、溪流、水库、池塘等多种水体,迄今未见对该地区水栖寡毛类区系的研究报道。通过2005年6月和12月两次调查,记述中山市水栖寡毛类31种,隶属4科16属,包括1个国内新纪录种即扇形管盘虫(Aulophorus flabelliger)以及19个广东省新纪录种。区系分析表明 ...
崔永德   +3 more
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Plant economics traits predict plant carbon allocation and responsiveness to arbuscular mycorrhizal fungi under varying precipitation

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Most terrestrial plant species form symbioses with arbuscular mycorrhizal fungi (AMF). However, the below‐ground carbon (C) allocation of plants and the nutritional and growth benefits provided by AMF within this symbiosis vary greatly across species and environments ...
Hengjun Zhao   +3 more
wiley   +1 more source

鄰苯二甲酸及鄰苯二甲酸二甲酯的好氧微生物降解 [PDF]

open access: yes, 2003
Microbial degradation of phthalate and dimethyl phthalate esters was investigated using an enrichment culture obtained from sewage sludge. Optimal degradation conditions were determined by an orthogonal test for environmental factors. More than 99% PA at
Fan, Y, Gu, J, Wang, Y
core   +6 more sources

黄河流域经济带生态环境绩效评估及其提升路径

open access: yesShuitu Baochi Xuebao, 2023
黄河流域经济带是我国北方重要的经济走廊,科学评估黄河流域经济带生态环境绩效水平,提高黄河流域沿线9省生态环境质量是实现黄河流域经济带的高质量发展重要举措之一。运用生态环境质量评估、生态效率评估等研究方法,开展2012—2017年的生态环境质量、生态效率和绿色全要素生产率评估。结果表明:黄河流域经济带生态环境绩效水平总体呈现由较低水平不断提升的趋势;黄河沿线九省在生态环境质量和生态效率系统层中有明显差异,生态环境质量系统层中,上游地区的最优;生态效率系统层中,中下游地区的生态效率最优且稳定 ...
鲁仕宝, 尚毅梓, 王浩, 廉志端
doaj  

Geographical Variation in Vegetative Growth and Sexual Reproduction of the Invasive Spartina alterniflora [PDF]

open access: yes, 2015
生物入侵是全球变化的重要内容,对全球经济和环境产生严重影响,并威胁生态系统的多样性。明确生物入侵发生的过程和机制可以有效地防控入侵生物带来的危害。繁殖是入侵种从定居到其后扩张过程中的一个重要的内在因素,进而可能影响入侵的成功。在入侵种扩散并占据广阔的地理分布区过程中,表型可塑性可能起到关键作用。揭示入侵种繁殖和表型可塑性在变异及其与环境因子的相关关系,对阐明外来物种的入侵机制和预测其分布具有重要的意义。互花米草原产美国大西洋沿岸和墨西哥湾,于1979年从美国引入中国。经过30多年的入侵和扩散 ...
刘文文
core  

Flexible parental care in a songbird correlates with sex‐specific responses to seasonal phenology, mating opportunity and reproductive success

open access: yesJournal of Animal Ecology, EarlyView.
This population‐comparative study reveals that male and female parents respond differently to social and ecological conditions. This sex‐specific responsive strategy is related to the incongruent parental care systems across populations in Chinese penduline tits.
Jia Zheng   +5 more
wiley   +1 more source

Study on the seasonal dynamics of small mammals in Jinhua City(金华城区小型兽类数量季节消长的研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2002
自1997年1月至1999年12月,选择金华城区的居民区、宾馆、粮库和工厂等4种生境5个调查点,每月以夹夜法对小型兽类数量的季节消长进行研究.结果表明,金华城区褐家鼠(Rattus norvegicus)的捕获率为0.58%、黑线姬鼠(Apodemus agrarius)0.26%、臭鼩鼱(Suncus murinus)0.24%、黄胸鼠(Rattus flavipectus)0.12%、小家鼠(Mus musculus)0.05%;捕获率的季节消长呈现以6月和9月为高峰的双峰型曲线 ...
BAOYi-xin(鲍毅新)   +3 more
doaj   +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  

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