摘要
文章选取了甘肃省民勤县作为研究区域,运用GIS技术和地统计学相结合的方法,根据1980年第二次土壤普查和2006年测土施肥土壤养分数据,制作了民勤县的土壤养分空间分布图,研究了该区域土壤养分空间的、时间的变异特征。结果表明,从1980年到2006年,土壤有机质、速效磷、碱解氮分别增加了11.2%,214.2%,1.04%,土壤速效钾减少了27.40%,这种时间上的变异主要是由耕作、施肥等人为因素引起的。空间变异的原因则各有不同,速效钾的含量变化主要受土壤母质影响较大,碱解氮的含量变化主要受农民施肥及耕作习惯影响较大,而有机质和速效磷的含量变化是受施肥、耕作、种植、灌溉等人为因素和结构性共同影响的结果。
According to the data of second soil survey in 1980 and the soil nutrient measurement in 2006, distribution maps of the nutrients content and the temporal had been drawn and spatial variability of soil nutrients were studied by using Arc GIS technique combined with geostatistics for Minqin county,Gansu Province.The results showed that the soil organic matter,available P and alkali-hydrolyzed increased by 11.1%,12.7%,1.02%, respectively and the available K decreased by 27.4%between 1980 and 2006. The temporal variation mainly contributed to people factors. However, the factors effecting spatial variation were different.To be specific, the content of available K and alkali-hydrolyzed were mainly influenced by the soil parent material and the people factors, respectively. And the content of soil organic matter and available P were a common results induced by structure and multi-people-factors including fertilization, tillage,planting and irrigation.
出处
《北方农业学报》
2016年第2期77-80,共4页
Journal of Northern Agriculture
关键词
GIS
土壤养分
时间变异
空间变异
GIS
Soil nutrients
Temporal variation
Spatial variation
