Results 21 to 30 of about 11,089 (155)
, 2009 通过2004年2～12月对古尔班通古特沙漠南缘2年生人工梭梭和沙拐枣混交林内3条典型坡面土壤水分进行了系统监测与研究。结果表明:人工林土壤水分状况受季节性降水、人工林种植密度、地形因子的影响而出现明显的时空分异。在空间上将土壤水分变化划分为三层,0～30cm为活跃层,30～60 cm为次活跃层,60～120 cm为相对稳定层。通过主成分分析,得出地形因子、种植密度对0～30 cm土层土壤水分的影响次序为坡度>坡向>种植密度>高程,30～60 cm土层为坡向>种植密度>坡度>高程,60～120 ...
付恒飞, 宋春武, 蒋进, 陈钧杰
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Spatial-temporal Evolution Characteristics of Land Use Carbon Emissions in Ningxia Hui Autonomous Region [PDF]
, 2023 [Objective] Land use change is one of the important driving forces for increasing carbon emissions and the environmental quality. The temporal and spatial pattern changes and effects of land use carbon emissions were analyzed in order to provide a ...
Jia Keli +4 more
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop +8 more
wiley +1 more source
Shuitu Baochi Xuebao, 2007 采用地统计学的方法,研究了江西泰和退化红壤区不同模式重建森林在高温干旱季节土壤水分空间变异规律及其分布格局。结果表明,在该研究尺度下,湿地松纯林、枫香纯林、湿地松与枫香混交林0~20 cm,20~40cm土层含水量分布都符合正态分布,都可较好地拟合成球状模型,表现出明显的空间相关性和空间分布格局。3种重建模式样地0~20 cm,20~40 cm层土壤含水量变异函数的基台值、变程都较无林荒地明显增大,而且基台值和变程在0~20 cm,20~40 cm两土层间的差异明显大于无林荒地,说明植被恢复以后 ...
杜志勇 +3 more
doaj +2 more sources
, 2017 依据1986—2015年相关统计数据和第六次人口普查数据,利用探索性空间数据分析方法和空间计量模型,分析了中国人口城镇化水平的时空分异及影响机制。研究表明中国三大板块、各省、直辖市、自治区户籍人口城镇化水平存在的较大差异、呈现东高西低的态势,但总体上处于稳定上升的趋势。提出第二、第三产业就业机会、城市政府财政投入是促进户籍人口城镇化水平提升的积极因素,其中第二、第三产业的就业机会最为重要。国家社会科学基金重大项目(13&ZD025)；国家级创新训练项目(201610384032)
唐礼智, 朱正天
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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
Conservation Biology, EarlyView.Abstract Despite the crucial role of human impacts on biodiversity loss, many assessments of this loss focus on single metrics, such as species richness, and overlook the multidimensional effects of human activities. Because of its importance to ecosystem functioning, we investigated the functional diversity of medium‐ and large‐sized mammal ...
Xueyou Li +8 more
wiley +1 more source
Simulation and Prediction of Xiamen Urban Expansion Based on A Coupling Relationship Between Land Use and Transportation [PDF]
, 2016 在经济新常态和新型城镇化战略不断推进的时代背景下，中国城市空间结构发展模式的转型已势在必行。在经历了长期的外延式城市空间快速扩张之后，人口和资源环境的矛盾、建设用地的紧张、交通供给与需求的脱节等成为我国城市空间发展中一系列不容回避的问题，城市空间由外延式扩张向内涵式提升的转型已经迫在眉睫。厦门市可建设用地的稀缺将对城市规模的扩张构成直接限制，但同时，在过去几十年的快速城市化进程中，由于缺乏对城市空间政策和公共投资的有效整合，城市空间增长有明显的分散化迹象 ...
周玉
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Spatial and Temporal Distribution Characteristics of Carbon Storage in Handan City Based on PLUS and InVEST Models [PDF]
, 2023 [Objective] The land use patterns and carbon storage distribution in Handan City, Hebei Province during the recent 20 years were analyzed, and the trends in land use changes under an ecological protection policy duirng the next 10 years were determined ...
Han Hongwei +6 more
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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