搜索结果: 1-11 共查到“农学 Spatial variability”相关记录11条 . 查询时间(0.171 秒)
Addressing spatial variability in provenance experiments exemplified in two trials with black spruce
Picea mariana (Mill.) provenance research REML spatial variation
2015/3/6
Two exemplary black spruce (Picea mariana [Mill.] B.S.P.) provenance trials were analyzed using traditional and spatial techniques. The objective was to find out possible differences between these app...
Modelling infiltration and geostatistical analysis of spatial variability of sorptivity and transmissivity in a flood spreading area
Philip’s two-term model SCS model variogram
2014/10/23
Knowledge of infiltration characteristics is useful in hydrological studies of agricultural soils. Soil hydraulic parameters such as steady infiltration rate, sorptivity, and transmissivity can exhibi...
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...
Assessment of Spatial Variability of Tambons Based on Farming Systems Characteristics for Scaling-up of Diversification in Khon Kaen Province,Thailand
animals horticultural crops rice upland crops
2009/6/10
Data from 174 non-irrigated farms in 50 tambons (sub-districts) in Khon Kaen Province, Thailand,taken by the Office of Agricultural Economics (OAE) on land area by type of agricultural use andincome s...
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。
Spatial variability of soil moisture as information on variability of selected physical properties of soil
soil moisture soil bulk density infiltration rate TDR technique
2008/11/11
The paper presents a method for the estimation of variability of soil bulk density and of variability of infiltration rate on the basis of easily determinable variability of soil moisture. First, the ...
Spatial variability of soil moisture in grassland
soil moisture geostatistical methods fractal analysis
2008/11/11
The paper evaluates spatial moisture variation in research sites in Poland - Pszczew (Wielkopolska Province), Pawłowice (Dolny Śląsk Province), and in Slovakia - Tatranska Kotlina. The ...
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...
SPATIAL VARIABILITY OF PLANT FUNCTIONAL TYPES OF TREES ALONG NORTHEAST CHINA TRANSECT
Northeast China Transect plant functional type precipitation gradient spatial variation
2010/3/23
Studying the spatial variability of plant functional types at large scale is important to
understand the effects of environmental change on ecosystems. Here we classified the tree species in the fore...