摘要
以西宁市二十里铺村的农田为研究区域，采用5m×5m网格法，选取84个观测点取样，进行室内分析，测定土壤有机质、水解氮、速效磷、速效钾的含量，分析土壤养分的空间变异规律。研究表明，土壤有机质、水解氮、速效钾的空间变异性不太明显，速效磷的空间变异性明显；有机质、水解氮和速效钾的空间变异主要是由结构性因素引起的，速效磷的空间变异是由随机因素引起的。有机质的变异函数理论模型为指数模型，水解氮、速效磷、速效钾变异函数理论模型为球形模型。栗钙土农田采样的密度范围在1～11m之间，将能够满足精确农业生产对这4种土壤养分的分析要求。
Eighty-four sampling plots of 5 m ×5 m were collected from a field in Er-shi-li-pu Village of Xining City, Qinghai Province, China. Soil organic matter, available N, available P, and available K were measured, and the patterns of spatial variations of soil nutrients were analyzed. The results indicated that the spatial variability of organic matter, available N, and available K was not obvious while the spatial variability of available P was obvious. The spatial variability of organic matter, available N, and available K was mainly caused by structural factors and that of available P was primarily caused by random factors. The semivariogram of organic matter was well described by exponential model while that of available N, available P, and available K was de- scribed by spherical model. In order to analyze the soil nutrients accurately in fields of chestnut soil, the appropriate sampling density was between 1 to 11 m.
出处
《干旱地区农业研究》
CSCD
北大核心
2006年第5期59-63,共5页
Agricultural Research in the Arid Areas
关键词
栗钙土
土壤养分
空间变异
半方差函数
chestnut soil
soil nutrients
spatial variability
semi-variogram
