内蒙古典型草原区土壤氮储量分布研究

发布时间：2018-01-19 21:25

本文关键词： 土壤氮储量地理加权回归克里金降水放牧压力典型草原　出处：《干旱区资源与环境》2017年11期 　论文类型：期刊论文

【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。
[Abstract]:Based on field survey data, meteorological station observation data and grassland grazing statistics data, correlation analysis and stepwise regression method were used to identify the main influencing factors of soil nitrogen reserves in the region. A geo-weighted multivariate regression Kriging model of soil nitrogen storage and grazing pressure index and rainfall was established. The spatial distribution of soil nitrogen reserves in typical steppe of Inner Mongolia was predicted by using this model. The results showed that precipitation and grazing pressure index had significant correlation with soil nitrogen reserves. The nitrogen reserves of 0-50cm soil were between 0.01 kg 路m-2 and 1.56 kg 路m-2; The spatial distribution of soil nitrogen reserves decreased from northeast to southwest, and the decrease of regional precipitation had a negative effect on the accumulation of soil nitrogen reserves. However, reducing grazing pressure by reducing the stocking rate of steppe or fencing is helpful to improve the soil nitrogen storage in the region.
【作者单位】：河南理工大学测绘与国土信息工程学院;北京师范大学资源学院;
【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
【分类号】：S812.2
【正文快照】： 作为草原生态系统养分循环的重要组成部分,土壤氮储量是植被生长的养分源泉[1,2],也是草原生态系统服务功能的重要评价指标[3]。气候变化和人类干扰引起的植被退化[4],导致的土壤氮储量流失和养分供应不足是自然草原植被生产力提高的重要限制因素,由此引起的环境和经济问题已

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