自然资源学报 ›› 2003, Vol. 18 ›› Issue (1): 37-43.doi: 10.11849/zrzyxb.2003.01.006

• 论文 • 上一篇    下一篇

黄土高原沟壑区小流域土壤NO3--N的积累特征及其影响因素

郭胜利, 郝明德, 党廷辉   

  1. 中国科学院、水利部、西北农林科技大学水土保持研究所, 陕西杨凌 712100
  • 收稿日期:2001-06-17 修回日期:2001-09-28 出版日期:2003-02-25 发布日期:2003-02-25
  • 作者简介:郭胜利(1969~),男,河北栾城人,副研究员,博士,主要从事土壤养分与土壤生态领域研究.
  • 基金资助:

    中国科学院知识创新方向性项目(KZCX2-413);国家自然科学基金项目(49890330).

N03--N accumulation and its affecting factors in small watershed in gully region of Loess Plateau

GUO Sheng-li, HAO Ming-de, DANG Ting-hui   

  1. Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources, and Northwest Science&Technology University of Agriculture&Forestry, Yangling 712100, China
  • Received:2001-06-17 Revised:2001-09-28 Online:2003-02-25 Published:2003-02-25

摘要: 以小流域为单元,分析了黄土高原沟壑区化肥投入、土壤NO3--N积累及其影响因素。结果表明,化肥投入是流域土地利用结构调整的重要支撑和保证因素,而流域土地利用结构的变化进一步拉动了化肥的投入。目前施肥条件下,流域内坡地果园存在显著的NO3--N积累,其积累量高于农田土壤,应作为今后重点监测对象。农田系统中,小麦或玉米连作土壤中NO3--N的积累最显著,通过作物之间的轮作可显著降低剖面中NO3--N的深层积累。土壤NO3--N的积累是小流域治理过程中产生的问题,与流域氮肥投入、氮肥吸收利用和土壤水分演变密切相关。

关键词: 小流域, 土地利用结构, NO3--N积累

Abstract: Chemical fertilizer input was the key factor affecting soil ecological environment and land productivity in a small watershed.Wangdonggou watershed is just the type of gully region on the Loess Plateau.The monitoring of chemical fertilizer input,land use change and land pro-ductivity started in the small watershed in1984.NO3--N accumulation in soil profiles of0~300cm was determined in croplands with continuous and rotation cropping systems,apple yard with7-and15-years of apple trees as well as fallow land in the small watershed.Fertilizer input,NO3--N accumulation,and land use structure were analyzed in the small watershed.The results showed that chemical fertilizer led to significant increase in land productivity and decrease in the area of cropland.Chemical fertilizer input was an important driver to land use structure change,the area of apple yard land increased significantly from1984to1995.Changes in land use structure further affected input of chemical fertilizer into the small watershed.NO3--N accu-mulation in soil depth of100~200cm has been significantly produced in cropland and apple yard land under current conventional fertilization practices.NO3--N accumulation in apple yard land was greater than that in cropland.NO3--N accumulation in continuous cropping systems was greater than that in rotational cropping systems.NO3--N accumulation was obviously related to fertilizer input,fertilizer uptake by crops,and soil moisture change in the small watershed.

Key words: small watershed, land use structure, NO3--N accumulation

中图分类号: 

  • S153