搜索结果: 1-13 共查到“土壤学 variability”相关记录13条 . 查询时间(0.14 秒)
Evaluation of the variability in runoff and sediment loss in successional fallow vegetation of Southern Nigeria
erosional losses soil erosion rainfall vegetation components vegetation fallows
2015/3/10
The effects of three different ages of natural fallow vegetation on runoff and sediment loss were investigated in a part of the rainforest zone of Nigeria. Measurements of runoff amount and sediment l...
Variability of Saturated Hydraulic Conductivities in the Agriculturally Cultivated Soils
saturated hydraulic conductivity method with falling head method
2015/3/1
The knowledge of the moisture conditions in a variably saturated zone of soil and their management is
one of the main possibilities that allow the agronomists to raise significantly the fertility of...
Variability of water repellency in sandy forest soils under broadleaves and conifers in north-western Jutland/Denmark
critical surface tension Denmark forest soils hydrophobicity water drop penetration time water repellency
2015/2/3
Soil water repellency has important consequences for ecological and hydrological properties of soils and usually retards infiltration capacity and induces preferential flow. This phenomenon has been k...
Study of Anthropogenic Soils on a Reclaimed Dumpsite and their Variability by Geostatistical Methods
soil survey soil reclamation anthropogenic soils spatial variability geostatistics
2015/1/28
Soils of reclaimed dumpsites after coal mining are considered as typical anthropogenic soils. These soils are at the beginning of their development and have certain specific characteristics. The aim o...
Comparison of Instrumentation to Measure Air and Soil-Surface Temperature Variability in Northern Alaska
Measure Air Soil-Surface Temperature Variability
2015/1/7
The Circumpolar Active Layer Monitoring (CALM) project has been observing permafrost (perennially frozen ground) and its overlaying active layer (which freezes and thaws annually) in northern Alas...
Spatial and temporal variability of soil freeze-thaw cycling across Southern Alberta, Canada
Freeze-Thaw Soil Temperature Agro-Ecosystem Modeling Regional Climate Soil Science
2013/3/5
Soil freeze-thaw cycles play an important role in all aspects of agro-ecosystems, such as crop productivity, the evolution of the soil matrix, including trace-gas emissions. In regions that experience...
Variability of soil water-physical properties in a small catchment of the Loess Plateau, China
Geostatistical analysis regression analysis rainfall seasn land use pattern
2011/1/13
Data from the Donggou small catchment, located in a typical wind-water erosion crisscross zone on the Loess Plateau of China, illustrate the spatial variability of soil water-physical properties of di...
不同土层土壤水分特征曲线的空间变异及其影响因素（Spatial Variability of Soil Water Retention Curve in Different Soil Layers and Its Affecting Factors）
土壤水分特征曲线 空间变异 多重分形
2010/1/28
利用多重分形和联合多重分形方法，对陕西杨凌地区0～20cm和20～40cm土层van Genuchten模型参数的空间变异性及其影响因素进行了研究。结果表明：0～20cm和20～40cm土层参数α都具有明显的多重分形特征，空间变异性较强，且分别是由低值和高值分布引起的；参数n和θs的多重分形特征不明显，空间变异性较弱。0～20cm和20～40cm土层van Genuchten模型参数与土壤物理特性...
Small Scale Spatial Variability of Apparent Electrical Conductivity within a Paddy Field
Spatial Variability Apparent Electrical Conductivity a Paddy Field
2009/12/2
This study aims to characterize the variability of soil ECa within a Malaysian paddy field with respect to the spatial and seasonal variability. The study was conducted at Block C, Sawah Sempadan, Sel...
Tillage Effects on Spatiotemporal Variability of Particulate Organic Matter
Tillage Effects Spatiotemporal Variability Particulate Organic Matter
2009/12/2
This study was performed to evaluate effects of no-till (NT) and standard tillage (ST) on POM in two 15-ha neighboring fields from 2003 to 2004. We also evaluated the effects of minimum tillage (MT) o...
牧场土壤含水率与坚实度空间变异与相关性分析（Determining Spatial Variability of Water Content and Hardness in Pastureland）
牧场草地 土壤 含水率
2009/5/22
利用土壤水分/圆锥指数复合测量装置，应用精细农作技术体系网格定点测量与GPS定位，在一块面积约1.27hm2的草地上获取了土壤含水率与坚实度空间分布基础数据，并针对采样过程中出现的数据缺失，用偏最小二乘法对数据进行修补。然后运用克里格插值法进行数字化成图，并在此基础上分别对含水率与坚实度的空间变异性及两者的相关性做了分析。
Based on regionalized variable theory, semivariograms of geo-statistics were used to research the spatial variation of soil properties quantitatively. The results showed that the semivario...
THE SPATIAL VARIABILITY OF UREASE ACTIVITY OF SURFACE AGRICULTURAL SOILS WITHIN AN URBAN AREA
soil urease activity site specific management
2010/11/30
Soil enzymes play a major role in the mineralization processes of organic materials. The soil enzymes originate from animal, plant and microbial sources and the resulting soil biological activity incl...