Results 81 to 90 of about 1,124 (186)
为探讨同时率定CN值和初损率2个参数得到的模拟结果是否比单独率定一个参数更为理想,且在不同土地利用类型下SCS-CN模型是否均适用,选取了密云水库上游石匣小流域为研究区域,根据石匣小流域坡面试验小区2006—2010年实测降雨-径流数据和SCS-CN模型的计算公式,在0.05~0.40范围内,等间隔选取8个不同的初损率值,并利用算术平均值法反推各初损率值条件下对应的CN值,以纳什效率系数为SCS-CN模型的适用性评价参数,确定裸地、耕地、草地和林地4种不同土地利用类型下模拟最佳的CN值与初损率 ...
何杨洋, 王晓燕, 段淑怀
doaj
Servicesheds connect people to the landscapes upon which they depend
Abstract Ecosystem services (ES) are benefits people receive from nature. To sustain these benefits, we need to spatially connect communities benefitting from specific ES with landscape features that generate the ES. A variety of process‐based models support ES assessments by estimating the biophysical supply of ES that comes from landscapes.
Yiyi Zhang +7 more
wiley +1 more source
以干旱半干旱脆弱区霍林河流域下游沿岸为研究靶区,利用1954年和1964年地形图.1986,1996和2000年的TM遥感影像作为基本信息源,在GIS支持下,建立土地利用空间数据库。引用空间测算模型和累计转换概率,分析不同时段各土地利用/覆被类型的动态和转换变化,揭示霍林河流域下游沿岸近50年土地利用/覆被变化过程及规律。耕地和草地是霍林河流域下游沿岸的主要土地利用/覆被类型,次之为盐碱地,湿地和林地比例较小,居民地和沙裸地最小。耕地和草地始终相反的幅度变化方向说明二者密切的相互转换关系 ...
卢晓宁, 邓伟, 张树清
doaj
A multitaxonomic assessment of Natura 2000 effectiveness across European biogeographic regions
Abstract The Natura 2000 (N2K) protected area (PA) network is a crucial tool to limit biodiversity loss in Europe. Despite covering 18% of the European Union's (EU) land area, its effectiveness at conserving biodiversity across taxa and biogeographic regions remains uncertain.
Lorenzo Ricci +10 more
wiley +1 more source
Experimentally testing animal responses to prescribed fire size and severity
Abstract Deserts are often highly biodiverse and provide important habitats for many threatened species. Fire is a dominant disturbance in deserts, and prescribed burning is increasingly being used by conservation managers and Indigenous peoples to mitigate the damaging effects of climate change, invasive plants, and land‐use change. The size, severity,
Tim S. Doherty +4 more
wiley +1 more source
Source and sink processes and long-term variation of Nutrients in the Jiulong River Estuary [PDF]
本研究根据九龙江河口2010年5月~2015年4月共18个航次的营养盐(氮,磷,硅)浓度及2014年2月~2015年4月共8个航次的硝酸盐氮氧同位素及颗粒有机物(POM)中的碳氮同位素观测结果,分析了近几年九龙江河口营养盐含量的年际变化及其可能影响因素,并探讨了河口内硝酸盐和颗粒有机物组成的季节差异及生物地球化学过程。在此基础上,收集了1980~2009九龙江河口营养盐历史观测资料数据,分析了九龙江河口营养盐长时间尺度变化情况,并归纳了近35年来九龙江河口营养盐含量变化对人为活动的响应模式 ...
吴小艳
core
Riverine Nutrients Export and its Biogeochemical Behavior in the Jiulong Estuary under Subtropical Storm Events [PDF]
由于气候变化(极端暴雨事件增加)和人类活动干扰(人为氮磷输入增加),亚热带流域-近海生物地球化学过程与通量受到显著影响。本研究选取九龙江流域-河口系统作为整体研究对象,以九龙江河流-河口混合区作为重点研究对象,开展常态和暴雨事件河流-河口营养盐(氮、磷、硅)和悬浮颗粒物的综合观测,分析暴雨事件河流营养盐输出过程、通量及主要控制因素,探讨河口营养盐生地化行为对河流输入的响应关系。主要研究结论如下: (1)常态下九龙江两大干流(北溪、西溪)的营养盐氮磷时空分布受污染分布和类型、大坝滞留和水文条件的综合影响 ...
吴殷琪
core
Remote sensing estimation on regional continuous daily evapotranspiration based on Richards equation [PDF]
Evapotranspiration (ET) is an important part of water cycle in nature, and the estimation of evapotranspiration on spatio-temporal scale has always been a hot issue. Remote sensing can estimate evapotranspiration on regional scale, but it is difficult to
Jinling KONG +4 more
core +1 more source
利用1984,1986,1991,1996年和2001年的多源遥感数据,结合GIS空间数据和野外考察资料等,对1984年东营市建市17年来黄河三角洲土地利用/覆盖格局和动态演变规律进行分析。1984年以来,黄河三角洲陆地面积总体上在不断增加。土地利用/覆盖类型以旱地和未利用地为主,旱地的面积有较大的减少,而未利用地的面积变化不大,略有增加。在各个不同的时段内,土地利用/覆盖变化的面积都占1/3左右。在土地利用/覆盖变化类型中,未利用地与耕地之间的双向转换非常频繁,是最重要的两种变化类型 ...
汪小钦 +3 more
doaj +2 more sources
Distribution characteristics and influencing factors of iron-rich groundwater in Xining City [PDF]
Groundwater is an important water supply source in Xining City. Previous works have found that iron-rich groundwater limits water development and utilization.
Bei LI +11 more
core +1 more source

