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黄土高原王东沟小流域土壤表层全磷空间变异性
赵晓芳1,2, 黄明斌2
1.西北农林科技大学 资源环境学院, 陕西 杨凌 712100;2.西北农林科技大学 水土保持研究所 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌 712100
摘要:
[目的]分析黄土高原小流域尺度地貌单元和土地利用方式对全磷空间变异的影响。确定全磷空间变异规律,为土地生产管理提供依据。[方法]2017年在黄土高原王东沟小流域采集了267个土壤样品进行了分析研究。用ArcGIS 10.2绘制样点全磷含量分布图,并分析不同地貌单元和土地利用方式下全磷含量的空间变异特征。[结果]王东沟小流域内不同地貌单元下全磷含量呈现为:塬面 > 塬坡 > 沟道的分布规律,不同的土地利用类型下全磷含量呈现为:果园 > 废弃果园 > 农地 > 林地 > 荒草地的分布规律。土地利用方式和地貌单元对全磷空间变异的影响极为显著。[结论]王东沟小流域土地利用经过14 a不断的调整,全磷的含量有了大幅度的提升,土地利用方式显著改变了全磷的空间分布格局。
关键词:  小流域  黄土高原  全磷  空间变异
DOI:10.13961/j.cnki.stbctb.2019.01.010
分类号:
基金项目:国家自然科学基金国际合作项目"黄土高原关键带植被-侵蚀相互作用及其对碳氮循环的影响"(41571130082)
Spatial Variation of Total Phosphorus in Soil Surface in Wangdonggou Watershed of Loess Plateau
Zhao Xiaofang1,2, Huang Mingbin2
1.College of Resources and Eniverment, Northwest A & F University, Yangling, Shaanxi 712100, China;2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation Research, Northwest A & F University, Yangling, Shaanxi 712100, China
Abstract:
[Objective] To analyze the effect of geomorphic units and land use on the spatial variation of total phosphorus in a small watershed of the Loess Plateau, in order to provide basis for land management. [Methods] In 2017, 267 soil samples were collected in the Wangdonggou watershed. The total phosphorus contents were measured for different geomorphic units and land use types and its spatial distribution was mapped by using ArcGIS 10.2. [Results] The land use patterns and geomorphologic units exhibited an extremely significant effect on the spatial variation of total phosphorus. The content of total phosphorus in different geomorphic units showed as: sorghum> slop> channel. The content of total phosphorus in different land use types showed as: orchards> abandoned orchards> farmland> woodland> wild grassland. [Conclusion] After more than ten years of agricultural intensification, the total phosphorus content has been improved greatly, and the distribution of total phosphorus has been substantially changed by the land use patterns.
Key words:  watershed  Loess Plateau  total phosphorus  spatial variation