Results 31 to 40 of about 11,655 (160)
Comprehensive framework for assessing and optimizing existing research networks
Conservation Biology, EarlyView.Abstract Conservation, monitoring, and research networks, or collections of ecological research sites unified under a common mission of data collection or a research mission, are essential infrastructure for understanding large landscapes. However, most networks developed opportunistically over decades rather than through systematic design, creating ...
Alyson East +2 more
wiley +1 more source
Research on Urban Life Circle System and Its Optimization Based on Multi-Source Trip Data: A Case Study of Xiamen City [PDF]
, 2016 城市的发展、科技的进步，触发了人们生活观念和生活方式的转变，使得研究者对重塑便捷、安全、合理的生活空间的探索热情愈加高涨。当前，城市规划面临由“生产空间导向”向“生活空间导向”的转型，关注城市居民日常生活，研究城市形态表象下的居民行为规律已然成为了城市规划研究领域的热点问题。本论文在分析城市生活空间组织方式转型必要性的基础上，通过对国内外已有生活圈理论进行总结探讨，从城市出行活动层面探讨生活圈体系的构建问题，提出以出行活动为原点、以复杂网络及社团发现为理论基础的城市生活圈构建及优化方法 ...
肖龙珠
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Conservation 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
Shuitu Baochi Xuebao, 2007 土壤中的水分是影响半干旱区作物生长的重要因素,由于自身的特点决定了其在空间分布上存在着变异性。以黑龙江省西部半干旱农业气候区的查哈阳农场为研究对象,利用GS 地统计软件和ArcGIS中的地统计分析模块(Geostatistical Analyst),对该地区土壤水分特性的空间变异性进行分析,得出土壤水分特性的变异程度、影响因素以及空间分布图。借助于土壤水分特性的空间分布图对该地区的灌溉水量进行了分析,为该地区的合理灌溉和精确灌溉提供依据。
姜秋香, 付强, 王子龙
doaj +2 more sources
Environmental Geochemistry Characteristics of Phthalate Esters in the Jiulong River and its Estuary, Fujian, China [PDF]
, 2016 邻苯二甲酸酯（Phthalateesters，PAEs）是一种普遍存在的全球性污染物，具有内分泌干扰效应和“致畸、致癌、致突变”作用。PAEs难溶于水，进入水环境后易吸附于颗粒物而进入沉积相，或被水生生物吸收而蓄积于生物体内。河流及河口作为连接陆地与海洋之间的过渡带，是陆源污染物质输送至海洋的最重要通道，研究PAEs在陆地河流及入海河口的污染状况、迁移过程、输送通量以及污染历史，是环境地球化学的重要内容，可为河流、河口及海洋生态环境PAEs的污染控制提供重要的理论依据。 论文选择九龙江及其河口为研究区域，
李荣丽
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Characteristics of macrobenthic communities in the estuary of Dagujia River and its adjacent water areas in Yantai, Shandong [PDF]
, 2016 为了解烟台大沽夹河河口及邻近海域大型底栖动物群落特征及受干扰情况,于2012年9月在上述区域设置12个采样点进行大型底栖动物群落调查和分析。对采集的生物样品进行物种鉴定、计数和称重,利用生物统计软件PRIMER计算优势度指数(Y)、Shannon-Wiener多样性指数(H')、Margalef丰富度指数(D)和Pielou均匀度指数(J),并进行等级聚类(CLUSTER)、非度量多维标度排序(non-metric multi-dimensional scaling,MDS)及丰度/生物量曲线 ...
周政权 +4 more
core +1 more source
Biodiversity‐driven spatial conservation planning to delineate temporally stable regions
Conservation Biology, EarlyView.Abstract The accelerating loss of biodiversity underscores the critical need for effective conservation strategies, particularly in the face of climate change and anthropogenic pressures. We devised a conservation planning framework that adopts a temporal stacking approach to species distribution models and landscape connectivity analyses. These models
Mattia Iannella +5 more
wiley +1 more source
Spatial and temporal variations of river water and sea-ice melted water in the western Arctic Ocean [PDF]
, 2015 北冰洋淡水组分的结构及其时空变化不仅显著影响北冰洋的生态系，而且对全球深海热盐环流和全球气候变化起着重要作用。本研究以白令海峡、楚科奇海陆架区和加拿大海盆等3个区域为研究对象，利用中国第1、2、3、4、5次北极科学考察在西北冰洋获得的海水δ18O数据，结合美国国家航空航天局发布的北冰洋δ18O数据，借助海水δ18O和盐度的质量平衡，定量研究淡水组分中河水和海冰融化水的贡献，揭示不同来源淡水组分在白令海峡、楚科奇海域及加拿大海盆的分布特征 ...
潘红
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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
汉诺坝玄武岩中麻粒岩和辉石岩捕虏体Sr-Nd-Pb同位素五维空间特征及其地质意义 [PDF]
, 1998 研究了汉诺坝玄武岩中麻粒岩和辉石岩捕虏体在Sr-Nd-Pb同位素五维空间中的特征 .结合捕虏体的空间分布相对位置, 认为层离作用可较好地解释不同类型捕虏体同位素之间的相互关系 ...
Chen, SH, Sun, M, Zhang, GH, Zhou, XH
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