Results 21 to 30 of about 11,737 (164)

Fluxes, Temporal and Spatial Variation and Influence Factors of Dissolved Nutrients in the Jiulong River Watershed [PDF]

open access: yes, 2016
营养盐是水生生物生长不可或缺的化学成分。河流是连接陆地与海洋两大生态系统的重要纽带,也是营养盐输送的一个关键渠道。九龙江作为福建省第二大河流连接了福建省东南部发达地区与台湾海峡,流域内环境压力较大,但对于人类活动对九龙江流域营养盐的生物地球化学行为及其排放尚不明了。 本研究于2013年3月至2014年4月对九龙江北溪、西溪和南溪河流端进行了高频取样,并在枯水期(2013年1月19-21日)及丰水期(2013年10月25-26日)分别实施了北溪及西溪全流域内的沿程调查取样 ...
陈国祥
core  

Synthesizing beaver coexistence messaging with the capability, opportunity, and motivation behavior model

open access: yesConservation Biology, EarlyView.
Abstract In the western United States, conservation practitioners are increasingly working with private landowners to restore habitat for North American beavers (Castor canadensis) and to use nonlethal mitigation techniques when beavers damage crops and infrastructure.
Brian D. Erickson, Megan S. Jones
wiley   +1 more source

天目湖流域土地利用的动态变化及其景观响应

open access: yesShuitu Baochi Xuebao, 2008
采用遥感、地理信息系统及景观分析的方法研究了天目湖流域1984年、1995年、2000年、2004年4个时段土地利用/覆盖变化及其景观响应。结果表明:20年来天目湖流域土地利用变化的阶段特征明显,2000~2004年这一时段的土地利用变化最为剧烈,共有14.75%的土地类型发生了变化,年均变化率为3.68%,且近期开发的空间范围广、强度大;各种景观指数对土地利用/土地覆盖变化呈明显的时空响应;迎湖地区景观格局指数的变化最为剧烈,背湖地区较为平缓;入湖河流流域的景观指数空间分异较为明显,下游地区变化较大 ...
李国砚   +4 more
doaj  

Survival strategy of Calanus sinicus in the northwest of the South China Sea [PDF]

open access: yes, 2015
中华哲水蚤(Calanussinicus)是我国近海生态系统的特征种之一,在我国浮游生物学和近海生态系统动力学研究中具有重要意义。本文基于2006~2007年在南海西北部进行的四个季节的航次调查,研究了中华哲水蚤的空间分布和季节变化,以广义可加模型为工具量化分析了影响中华哲水蚤丰度变化的重要环境因子,同时探讨了南海西北部中华哲水蚤的种群来源和生存策略问题。主要研究结果如下: (1)中华哲水蚤的丰度变化具有显著的季节差异。在北部湾调查区域,春季平均丰度为2.37±8.00ind/m3,占桡足类总丰度的6 ...
杨璐
core  

Dynamic Changes of Terrestrial Vegetation Cover in Lugu Lake Wetland Nature Reserve, Sichuan Province from 2000 to 2020 [PDF]

open access: yes, 2023
[Objective] The spatial-temporal variation of terrestrial vegetation coverage in Lugu Lake Wetland Nature Reserve in Sichuan Province during 2000—2020 was analyzed in order to provide a reference for the construction and management of the reserve ...
Gao Yu   +4 more
core   +1 more source

Biodiversity‐driven spatial conservation planning to delineate temporally stable regions

open access: yesConservation 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

湿地土壤养分的空间异质性研究方法构想

open access: yesShuitu Baochi Xuebao, 2001
湿地土壤养分是时空连续的变异体,不论尺度大小均具有高度的空间异质性.湿地土壤养分变量属于区域化变量,同时具有随机性和结构性,仅运用经典的Fister统计方法已经不能满足土壤空间异质性研究的需要.地统计学是近几十年发展起来的一门新的空间分析方法,其变异函数则适合于定量研究区域化变量空间结构变异特征,能够全面反映区域化变量的结构性.作者在前人的工作基础上意欲用地统计学的区域化变量理论和变异函数对湿地土壤养分的空间异质性进行定量研究,并对其研究方法进行了构想.#
白军红 余国营 张玉霞
doaj  

Land-use Effect and Seasonal Hydrologic Controls on Nitrogen Export in Typical Sub-watersheds within Jiulong River Watershed [PDF]

open access: yes, 2016
在过去的几十年里,世界范围的大部分地区都经历了由于进入近海的河流氮通量的大量增加而导致的富营养化和其它生态损害。氮、磷作为限制性营养盐,控制着河流-近海系统富营养化,威胁着我们所依赖的生态系统服务与功能。河流营养盐状况是植被、土壤、地形、气候、土地利用状况等自然和人为因素综合作用的结果,这些因素在不同时空尺度内交互作用,使得河流营养盐输出的影响机制研究更具挑战性。本研究开展亚热带流域氮输出对土地利用及水文状况季节性变动的响应,可为流域综合管理和区域用水安全提供科技支撑。 本研究通过现场监测、GIS技术 ...
赵盼盼
core  

Effects of Climate Change and Human Activities on Vegetation Coverage in Arsenic Sandstone Area of Yellow River Basin [PDF]

open access: yes, 2023
[Objective] The arsenic sandstone area is the most serious soil erosion area in the Yellow River basin. Vegetation coverage changes and their driving factors were determined in order to provide a scientific reference for vegetation restoration and ...
An Li   +5 more
core   +1 more source

Overlap of nonbreeding wandering albatrosses with fisheries and implications for colony‐specific population trajectories at South Georgia

open access: yesConservation 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

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