Response Characteristics of Soil Saturated Hydraulic Conductivity after Returning Orchard to Farmland on the Loess Plateau [PDF]
[Objective] To explore the change rule and influencing factors of soil saturated hydraulic conductivity (Ks) after returning orchard to farmland. [Methods] Aging apple orchards (AO) and orchards with different tillage years (2 a, 4 a, 6 a, 10 a) on the ...
JIA Xiaoxu +6 more
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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
Satellite observation of the temporal and spatial variations of sea surface diurnal warming and the mechanism in the South China Sea [PDF]
, 2013 海表面日增温(Seasurfacediurnalwarming)是对海表温度(SeaSurfaceTemperature，SST)白天比晚上高的日变动现象的一种量度，通常可近似地用遥感SST的昼夜温差来表示。海表面日增温不仅是准确估算海-气热量和水汽交换的重要参数，而且是海洋动力过程、营养盐、生物种群分布变化的重要影响因子。随着多平台遥感技术、模型等的发展，SST日变动的时空分布规律逐渐为学界所认识。基于多传感器反演算法等的差异造成海表面日增温的差异，且区域性日增温的时空分布仍未细致分析 ...
林锐
core
Spatial Differentiation and Correlation of Ecological Stoichiometric Characteristics of Cynodon dactylon and Soil in the Water-level Fluctuation Zone of the Three Gorges Reservoir Area [PDF]
[Objective] Cynodon dactylon is an important component and the dominant species in the ecosystem of the water-level fluctuation zone (WLFZ) of the Three Gorges Reservoir, the largest hydropower project in the word.
JIAN Chen +4 more
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Shuitu Baochi Xuebao, 2021 土壤水力参数是土壤水分和污染物迁移等陆面过程数值模拟的重要基础参数。为探明关中平原农田土壤水力参数空间分异特征，建立空间分布预测模型，在关中平原网格布设124个样点，采集根层0-20 cm原状和扰动土壤样品，利用van Genuchten模型拟合获取土壤水分特征曲线，获得残余含水量（θr）、饱和含水量（θs）以及系数α和n等土壤水力参数。采用经典统计学、地统计学和结构方程方法分析了θr、θs、α和n的空间变异特征及影响因子，建立了水力参数传递函数预测模型。结果表明：θr和α为强变异，θs为中等变异 ...
牛晓倩 +4 more
doaj
Global patterns of species richness of the holarctic alpine herb Saxifraga: the role of temperature and habitat heterogeneity [PDF]
, 2021 The effects of contemporary climate, habitat heterogeneity and long-term climate change on species richness are well studied for woody plants in forest ecosystems, but poorly understood for herbaceous plants, especially in alpine–arctic ecosystems. Here,
Danilo Rafael Mesquita Neves +13 more
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METHANE FLUXES FROM MANGROVE COMMUNITIES AT DONGZHAI HARBOUR,HAINAN [PDF]
, 2000 采用静态箱法对海南东寨港 4个站位的 5个红树林群落的土壤甲烷通量进行了研究 ,结果表明林地土壤平均甲烷通量为 0 .81m g.m- 2 .d- 1 。利用聚乙烯袋密闭法测定了 6种红树植物叶片的甲烷通量 ,发现红树植物叶片具有吸收大气甲烷的效应。通过海莲 (Bruguiera sexangula)红树林的研究还表明 ,林地土壤甲烷通量的日变化与林内潮水淹浸状况有关。海莲林不同滩面土壤甲烷通量的差异与土壤含水量有关。土壤甲烷通量的季节差异因植被类型或土壤性质不同而表现为两种形式Using a ...
卢昌义, 叶勇, 谭凤仪, 黄玉山
core
Hydrochemical characteristics and water quality dynamic analysis of shallow groundwater in Huaibei Plain [PDF]
Shallow groundwater is the most important source of agricultural water supply in Huaibei Plain, and its water quality has attracted wide attention.
Chunfang ZHU +7 more
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The Terraced Walls Significantly Influence the Spatial Distribution of Soil Water in Terraced Areas on the Loess Plateau [PDF]
[Objective] Converting slopes into terraces is a crucial soil and water conservation and agricultural measure on the Loess Plateau. Understanding the impact of terraced walls on soil water is conducive to preserving soil water and enhancing terrace ...
BAI Chenyun +5 more
core +1 more source
Shuitu Baochi Xuebao, 2008 土壤含水率在水平和垂直方向上均具有高度的时空异质性,关于水平方向变异的研究取得了很大进展,而对垂直方向变异的研究较为缺乏。为掌握土壤含水率在剖面上的垂直变异特征,采用经典统计、地统计及分形分析相结合的方法,研究了黄土高原典型坡地剖面土壤含水率的时空变异性。结果表明:不同测定时间下的剖面土壤含水率均服从自然对数正态分布,在空间上均表现为中等变异性,沿土层深度方向的变化趋势均为增长型,且这种变化规律具有时间稳定性;剖面土壤含水率在整个研究区域尺度、微尺度上的半方差函数均可用指数模型进行很好地拟合 ...
王云强, 张兴昌
doaj