植物营养与肥料学报Issue(6)：1376-1385,10.DOI:10.11674/zwyf.2013.0611
西安市粮食主产区耕层土壤速效养分空间特征
Spatial characteristics of soil available nutrients in the major grain-producing region of Xi’ an, China
摘要
Abstract
The objectives of this research was to find out the present situation of soil available nutrients in the major grain-producing farmlands in Xi ’ an City , Shaanxi Province , which is the theoretical basis for the balanced fertilization , farmland fertility maintenance and efficient agricultural production .Based on the GIS technology and taking the agricultural regions of Chang ’ an District , Hu County and Zhouzhi County in Xi ’ an City as the research area, the spatial variability , supplying availability and the main influencing factors of soil available N , P and K were analyzed using statistics and geostatistics combined with the results of “3414” experiments .The average contents of soil available N , P and K are 59.06 mg/kg, 21.26 mg/kg and 127.66 mg/kg with the N∶P∶K ratio ranging from 1∶1∶2 to 5∶1∶15, showing obvious urban-rural transition trends (East-West direction).Under 500 m sampling scale, the nugget to sill ratios of the available nutrients is 0.533-0.710, in the range of moderate spatial dependence .The nutrient spatial variability is affected not only by natural factors including topography , geography , soil types and textures , but also by human activities such as fertilization and irrigation .In the area studied , soil available K is abundant as a whole , P and N is lack in 1.14%and 50.78%of farmland respectively . Not scientific fertilization and induced low N efficiencies are the main obstacles in the grain production .关键词
地统计学/速效氮/速效磷/速效钾/耕地/空间特征/西安市Key words
geostatistics/available nitrogen/available phosphorus/available potassium/farmland/spatial characteristic/Xi�an City分类
农业科技引用本文复制引用
赵业婷,李志鹏,常庆瑞,齐雁冰,刘京..西安市粮食主产区耕层土壤速效养分空间特征[J].植物营养与肥料学报,2013,(6):1376-1385,10.基金项目
国家“863”计划课题（2013AA102401）；国家科技支撑计划课题（2012BAH29B04）；陕西省耕地地力调查与质量评价项目资助。 （）
