Results 51 to 60 of about 429 (132)
, 1997 城市是一个生态经济系统，具有人口高度聚集、生态边缘性和经济中心性共存、环境污染严重和系统脆弱等特点。必须对城市进行生态经济规划，科学地确定城市的功能结构、人口规模、分区性质、工业布局、基础设施等，使城市既成为一个地区社会经济发展的中心 ...
何敦煌
core
Responses of Loess Ground with Different Slopes and Vegetation Covers to Rainfall Infiltration [PDF]
[Objective] To investigate the soil moisture response to rainfall in loess ground with different slopes and vegetation types. [Methods] Eight in-situ observation plots were established, including flat surfaces with bare soil, Artemisia cover, and Robinia
HU Xiangyang +6 more
core +1 more source
Distribution of Fine Roots in a Mixed Cunninghamia lanceolata-Tsoongiodendron odorum Plantation [PDF]
, 2002 对27年生混交比例为2行杉木和1行观光木的混交林和杉木纯林群落细根分布的研究表明,杉木和观光木行间的杉木细根密度虽比杉木与杉木行间的低8.5％,但观光木细根密度则高152.09％,其细根总密度比杉木与杉木行间的大10.43％。混交林中杉木各径级活细根密度呈单峰型分布,均以5-10cm土层最大,而观光木各径级活细根主要分布在0-10cm土层内。纯林杉木各径级活细根密度亦基本呈单峰型分布,但峰值出现在10-20cm或20-30cm土层。不同树种不同径级死细根的分布均与其各自的活细根分布相似 ...
何宗明 +4 more
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Characteristics and Influencing Factors of Soil CH4 and N2O Fluxes in Typical Broad-leaved Forests in the Yangtze River Delta Region, China [PDF]
[Objective] The forest coverage rate in the Yangtze River Delta region reaches 33.4%, and the underlying surface soil may have an important impact on the regional greenhouse gas budget.
CHEN Bingjiang +7 more
core +1 more source
Soil Hydrothermal Characteristics of Orchard Based on Leaf Area Index Coupled with STEMMUS Model [PDF]
[Objective] As a key parameter in the simulation study of ecosystem water cycle process, rapid dynamic simulation of leaf area index (LAI) can solve the limitation that the coupled soil water-vapor-heat-air model STEMMUS (simultaneous transfer of energy,
GAO Xiaodong +3 more
core +1 more source
Shuitu Baochi Xuebao, 2021 为了研究中国西南水梯田的土壤水分特性，以云南哈尼梯田为例，选取哈尼梯田核心区全福庄小流域内林地、荒草地、旱地和水田4种土地利用类型，分层取0—10，10—20，20—40，40—60，60—80，80—100 cm深度土样测其主要土壤理化指标和土壤水分特征曲线，分析其土壤的持水性和水分有效性。结果表明：（1）哈尼梯田4种不同土地利用类型土壤容重变化范围为0.61~1.41 g/cm3，且0—40 cm与40—100 cm差异性显著，土壤有机质含量为1.17%~9.65 ...
李源, 宋维峰, 马建刚
doaj
Combined Effects of Humic Acid-Modified Magnetic Biochar and AMF on the Properties of Saline-Alkali Soil and Photosynthetic Parameters of Muskmelon [PDF]
[Objective] To improve humic acid-modified magnetic biochar (HA-MBC) and explore the combined effects of modified biochar and arbuscular mycorrhizal fungi (AMF) on the properties of saline-alkali soils and the growth of muskmelon.
CHEN Xinyan +12 more
core +1 more source
Shuitu Baochi Xuebao, 2011 对大兴安岭山地樟子松天然林土壤水分物理性质及水源涵养能力进行研究,结果表明,0-20 cm土层土壤含水量、土壤毛管孔隙度、总孔隙度、枯落物蓄积量和蓄水量均表现为:坡下>坡中>坡上,土壤含水量变化范围为278.71~377.98 g/kg,平均值为327.67 g/kg;整个坡面土壤毛管孔隙和总孔隙度平均值分别为29.08%和53.15%;枯落物蓄积量和最大蓄水量分别为16.72,53.24 t/hm2。0-20 cm土层土壤容重随坡位降低有减小趋势,其平均值为0.84 g/cm3。土壤非毛管孔隙 ...
李奕, 满秀玲, 蔡体久, 盛后财
doaj
Shuitu Baochi Xuebao, 2023 为了揭示生物炭改良土壤孔隙的复杂结构及其影响因素,以江苏滨海盐渍土为研究对象,采用添加生物炭改良盐渍土,设置0,2%,5%(占表层0-20 cm土重比)3个生物炭添加水平。每年10月在水稻收割后,采用塑料环刀取表层(0-20 cm)原状土,进行Micro-CT扫描获取土壤CT孔隙序列。基于多重分形去趋势波动分析理论,并结合数据重排,分析施加生物炭对CT孔隙序列多重分形特征及其来源的影响。结果表明,所有处理的CT孔隙序列的复杂度均随着年份增长;2%生物炭处理的CT孔隙序列的复杂程度较0和5 ...
孙枭沁, 佘冬立
doaj
Soil Preferential Flow Characteristics in Coal Mine Subsidence Area under Different Rainfall Duration [PDF]
[Objective] Research on the preferential flow characteristics triggered by cracks in coal mining subsidence areas can provide support for scientific and rational development of water resource management and ecological management practice in the mining ...
DAI Bin +4 more
core +1 more source