摘要
利用湟水流域已有文献中38个农田耕层(0~20cm)土壤全氮数据,采用传统统计学与地统计学相结合的方法,分析了该流域农田土壤全氮空间分布及影响因素。结果表明:土壤全氮均值为1.33g·kg^(-1),变异系数为47.37%,属中等变异。流域农田土壤全氮呈自北向南逐渐递减,由东向西先增加后减少的空间分布格局。按全国土壤全氮分级标准,高值区(>1.50g·kg^(-1))集中在海拔较高的大通县、海晏县,低值区(<1.00g·kg^(-1))集中于海拔稍低的民和县、湟中县,65.5%的区域达全国平均水平(1.30g·kg^(-1))。影响因子定量分析表明,不同的气候因子、土壤类型、海拔、施肥量都会影响该流域土壤全氮的空间分布,其中气温、海拔、降水为主要影响因子,对全氮变异的独立解释能力分别为35.7%、29.0%、21.3%。该研究初步揭示了湟水流域农田土壤全氮的空间分布特征,可为流域尺度农田的科学管理提供有益参考,并为合理开展施肥工作提供参考依据。
Soil total nitrogen（TN）is one of the important indicators reflecting soil quality.Huangshui River Basin is the main grain producing area in Qinghai Province.At present,the soil research on Huangshui River Basin was mainly concentrated in the evaluation of soil nutrient in cropland,soil microbial dynamic distribution research.Studying for spatial distribution and influencing factors of cropland TN content was rarely reported in this Basin.Therefore,based on the 38topsoil（0-20cm）TN data of existing literatures on cropland in Huangshui River Basin,combined traditional statistics and geostatistics,analyzed spatial distribution and influencing factors of cropland topsoil TN in Huangshui River Basin.The result indicated that the mean TN content was about 1.33g·kg^-1,the coefficient of variation was 47.37%,belonged to a moderate variation.And TN content of spatial distribution decreased from north to south while an alternative trends of first increasing and then decreasing from east to west,regarding to Ordinary Kriging analysis.As for the distribution trends of TN content regarding to national standard,high-level value（1.50g·kg^-1）was mainly distributed in the high-altitude of Datong county and Haiyan county,low-level value（1.00g·kg^-1）was mainly distributed in the low-altitude of Minhe county and Huangzhong county.Among which,about65.5%area of the basin reached beyond the average level（1.30g·kg^-1）.Temperature,altitude and precipitation were three main influencing factors of TN content distribution in this basin,according to correlation analysis,variance analysis and regression analysis,which accounts for 35.7%,29.0%and21.3%of TN variability,respectively,soil type and fertilization showed certain amount of correlation with TN while very low impacts value due to data lacking.The results showed that the spatial distribution of cropland topsoil TN in Huangshui River Basin,provided useful reference for the scientific management of cropland,and provided a basis for rational fertilization work.
出处
《北方园艺》
CAS
北大核心
2017年第16期131-138,共8页
Northern Horticulture
基金
国家自然科学基金青年资助项目(41301230)
国家科技基础工作专项资助项目(2014FY110200A04)
关键词
土壤全氮
农田土壤
地统计
空间分布
影响因素
soil total nitrogen
cropland soil
Geo-statistics
spatial distribution
influencing factors
