内蒙古典型草原区土壤氮储量分布研究  

Distribution of soil nitrogen storage in the typical steppe of Inner Mongolia

作　　者：李瑞华[1] 李晓兵[2] 牛海鹏[1] 张蒙 白云晓 

机构地区：[1]河南理工大学测绘与国土信息工程学院,焦作454000 [2]北京师范大学资源学院,北京100875

出　　处：《干旱区资源与环境》2017年第11期110-115,共6页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(U1504401);国家基础研发项目(2014CB138803);河南省高等学校哲学社会科学创新团队项目(2016-CXTD-04);河南理工大学博士基金和社科专项经费项目(B2015-19和13158935)资助

摘　　要：基于野外调查数据、气象站观测数据和草原放牧统计数据,利用相关分析和逐步回归方法识别区域土壤氮储量的主要影响因素,建立了土壤氮储量与放牧压力指数和降雨两个影响变量的地理加权多元回归克里金模型,并利用该模型预测了内蒙古典型草原土壤氮储量的空间分布。结果表明:降水和放牧压力指数与土壤氮储量具有显著的相关关系;研究区域0-50cm土壤氮储量在0.01kg·m-2和1.56kg·m-2之间;土壤氮储量空间分布整体上呈自东北向西南递减的特征。区域降水减少对土壤氮储量累积具有不利的影响,而通过降低草原载畜率或采用草场封育措施降低放牧压力则有助于提高区域土壤氮储量。In order to identify the major influence factors by using correlation analysis and stepwise regression, we set up a geographically weighted regression kriging model （GWRK） between soil N storage and precipitation and grazing pressure index and predicted the spatial distribution of soil N storage in the typical steppe of Inner Mongolia, China. The data was derived from multi - source data of field survey, meteorological and statistical data. Results showed that there were significant correlations between soil N storage and precipitation and grazing; the soil N storage varied from 0.01kg · m-2 to 1.56kg · m-2 in the 50cm soil depth; and the soil N storage di- minished from northeast to southwest in the spatial distribution. Regional precipitation reduction has adverse in- fluence on the soil nitrogen storage, but decreasing stocking rate or adopting pasture fostering measures to lower grazing pressure is helpful to the soil nitrogen storage increase.

关 键 词：土壤氮储量 地理加权回归克里金 降水 放牧压力 典型草原 

分 类 号：S158.3[农业科学—土壤学]