Results 31 to 40 of about 11,089 (155)
Study on latitudinal gradient of species diversity in forest communities [PDF]
, 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
Structured machine learning modeling to support conservation of deep‐sea benthic biodiversity
Conservation Biology, EarlyView.Abstract Biodiversity monitoring programs need to deliver accurate, timely, and actionable predictions. To establish a predictive monitoring program for deep‐sea benthos of the Santos Basin, Brazil, we developed a two‐stage structured model that allowed comparison of biodiversity predictions obtained from environmental simulations (2M‐Sim).
Gustavo Fonseca +23 more
wiley +1 more source
, 2017 依据1986-2015年相关统计数据和第六次人口普查数据,利用空间数据分析方法,分析中国人口城镇化水平的时空分异以及机制.研究结果表明：中国三大板块、各省户籍人口城镇化水平存在较大差异,呈现东高西低的态势,但总体上处于稳定上升趋势.户籍人口城镇化高水平的省份有向东部集中的趋势,中等水平以下地区呈现一定程度集聚态势,主要分布在中部部分省份和西部大多数省份,低水平的省份呈现从西部向中部逐渐扩展的趋势.为了提高户籍人口城镇化水平以及城镇化质量,重点在于推进公共服务均等化,探索就近（地）城镇化道路 ...
朱正天
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Spatial-temporal Variation and Driving Forces of Water Yield in Harbin City [PDF]
, 2023 [Objective] The spatial-temporal variation characteristics of water yield services in Harbin City, Heilongjiang Province from 2000 to 2020 were determined, and the driving mechanism of the spatial-temporal differentiation characteristics of Harbin City’s
Hu Yuandong, Qi Yuxin
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Conservation Biology, EarlyView.Abstract Bycatch in fisheries is one of the most serious threats to pelagic seabirds, causing major population declines. Mitigation measures can reduce bycatch substantially, but many fisheries fail to apply best practices, and seabird mortality remains high.
V. Warwick‐Evans +2 more
wiley +1 more source
Research on the Classification Regulation of Land Supply under a Differential Housing Market [PDF]
, 2016 近十年来随着我国住房市场的快速发展，我国居民住房条件得到很大改善，住房供求矛盾得到明显缓解。在此背景下，以2013年为时间标志，我国城市住房市场发展出现了分化的新趋势和新特征，当我国一线和二线重点城市的住房市场仍然存在结构与区域性矛盾时，其他二线和三四线城市的住房供应已经超出了经济社会发展的需要，这两种情况都给城市经济和社会稳定带来不同程度的风险，城市住房市场的分类调控、分类实施势在必行。 本研究在文献回顾的基础上，首先，根据中国地价监测系统、统计年鉴等提供的房地产数据，对2013 ...
章国宝
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Spatial Differentiation and Correlation of Ecological Stoichiometric Characteristics of Cynodon dactylon and Soil in the Water-level Fluctuation Zone of the Three Gorges Reservoir Area [PDF]
[Objective] Cynodon dactylon is an important component and the dominant species in the ecosystem of the water-level fluctuation zone (WLFZ) of the Three Gorges Reservoir, the largest hydropower project in the word.
JIAN Chen +4 more
core +1 more source
Conservation Biology, EarlyView.Abstract Although significant biodiversity has been safeguarded by protected areas (PAs), biodiversity trends continue downward. Within the frameworks of the EU Biodiversity Strategy for 2030 and the new EU Restoration Regulation (2024), conserving critical biodiversity areas is essential.
George Kefalas +14 more
wiley +1 more source
, 2009 我国的城市居住空间分异现象是伴随着市场经济体制及住房商品化改革逐渐衍生出来的。针对北京、上海、广州等大城市的研究表明,我国城市居住空间分异现象已在多种尺度上出现。本文是在社区的层次上对厦门市居住空间分异的实证研究。研究发现,当前厦门市存在居住分化的端倪,但这种分化只是初步体现在居民的收入、文化程度及职业等社会属性特征上,还没有深入到社区认同(意识层面)及社群交往(行为层面 ...
苏丽丽
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Conservation Biology, EarlyView.Abstract Procedural, distributional, recognitional, and epistemic justice aspects of conservation interventions are well documented in contexts where pastoralism is a key livelihood and way of life. Geospatial analyses and representations of wildlife conservation and restoration that are increasingly applied in pastoralist rangeland socioecological ...
Ryan R. Unks
wiley +1 more source