新郑市农田土壤有机质的空间变异  

Spatial variation of soil organic matter in farmland from main grain growing regions of Xinzheng City,Henan Province

作　　者：蔡太义[1] 张合兵[1] 陈志超[1] 刘昌华[1] 黄会娟[1] 王康[1] 徐丹[1] 

机构地区：[1]河南理工大学测绘与国土信息工程学院,河南焦作454000

出　　处：《草业科学》2014年第5期818-825,共8页Pratacultural Science

基　　金：国土资源部公益性行业科研专项项目(201211050)

摘　　要：基于国土资源部（河南新郑市）野外试验基地相关数据,运用GIS及地统计学方法,从乡镇级和行政村级两个尺度对河南典型区域——新郑市农田耕层土壤有机质空间变异特征进行研究。结果表明,新郑市乡镇尺度土壤有机质含量变异性（24.49%）低于行政村间变异性（27.71%～28.70%）,其布设样点数分别以100和1 000个为宜;农田各项管理措施中秸秆还田对土壤有机质含量影响最大。从县域尺度的农田土壤有机质可靠性计量来看,乡镇级尺度采样优于行政村级尺度,秸秆还田是新郑市农田土壤有机质含量提高的关键措施之一。The content and variation of topsoil organic matter at township or villages unit in farmland from Xinzheng City, Henan Province, China were analyzed based on the data from field test site of local Chinese Ministry of Land ＆ Resources. The parameters were determined using the geostatistical trend analysis of ArcGIS10.0 and GS^＋ 9.0 with cross-validation methods. The unobserved soil organic matter （SOM） data was estimated by the ordinary Kriging method. The results showed that variability of township scale （24. 49%） was less than that of villages （27.71%～28.70%） and the appropriate samples number were 100 and 1 000, respectively. Straw returning had great effects on SOM among different farmland management measures. The results s scale and straw returning to fie uggested that it was appropriate to take soil sample at township scale than villages ld played an important role to improve soil organic matter in farmland.

关 键 词：土壤有机质 空间变异性 粮食主产区 GIS 秸秆还田 

分 类 号：S153.6[农业科学—土壤学]