草地学报

›› 2005, Vol. 13 ›› Issue (1): 66-70.DOI: 10.11733/j.issn.1007-0435.2005.01.016

• 研究论文 • 上一篇    下一篇

黄土高原沟壑区苜蓿地土壤碳、氮、磷组分的变化

张春霞1, 郝明德1, 李丽霞2   

  1. 1. 中国科学院, 水利部, 水土保持研究所;
    2. 西北农林科技大学资环学院, 陕西, 杨凌, 712100
  • 收稿日期:2003-11-13 修回日期:2004-05-12 出版日期:2005-02-15 发布日期:2005-02-15
  • 通讯作者: 郝明德
  • 作者简介:张春霞(1977- ),女,河南开封人,硕士,主要从事土壤肥力与生态环境建设研究,E-mail:zhangcx2@etang.com
  • 基金资助:
    中国科学院知识创新工程项目(KZCX2-413);国家科技攻关项目(2001BA508B18)

Soil Composition of Carbon、Nitrogen and Phosphorus after Successive Years of Alfalfa Planting in the Gullies of the Loess Plateau

ZHANG Chun-xia1, HAO Ming-de1, LI Li-xia2   

  1. 1. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling Shaanxi Province 712100, China;
    2. Notherwestern Sci-technology University of Agriculture and Forestry Yangling, Shaanxi Province 712100, China
  • Received:2003-11-13 Revised:2004-05-12 Online:2005-02-15 Published:2005-02-15

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摘要： 对黄土高原沟壑区不同种植年限苜蓿(Medicago sativa)地土壤碳、氮、磷组分的分析结果表明:连续种植5年,土壤碳、氮各组分含量最低,而年限延长含量则有所提高;15年生苜蓿生长已进入衰退期,各组分含量远低于土壤肥力得到一定程度恢复的23年生苜蓿地.P与C、N组分的变化不同,Ca2-P和Fe-P含量随年限延长逐渐降低,到23年时又有升高趋势,而Ca8-P、Al-P、O-P变化趋势则与之相反,5年生苜蓿地以中活性有机磷为主,10年、15年、23年生苜蓿土壤有机磷组分的变化表现为:中稳性有机磷(MROP)>中活性有机磷(MLOP)>高稳性有机磷(HROP)>活性有机磷(LOP).

关键词: 有机碳, 有机氮, 无机磷, 有机磷

Abstract: A study of the soil composition of Carbon、Nitrogen and Phosphorus in a plot of successive years of planting alfalfa crops shows that the content of compounds of soil C and N reaches the lowest leavel in 5th year. Hereafter ,the soil content of the two elements begins to rise. A 15-year-old alfalfa crop entered its declining stage, and the soil in which the crop is growing contains far less C and N contents than the soil cultivating a 23-year-old alfalfa crop, in which the nutrient contents of C and N have restored to a certain extent.However, the phosphorus content in the same plot increases and reduces in a contrary way. The content of Ca2-P and Fe-P decrease with the plant growth years until it is 23-year-old when contents of these elements begin to increase; while the increase and reduction of Ca8-P、Al-P and O-P, contents moving a contrary way-the soil growing a 5-year-old alfalfa crop is impregnate with moderate liable organic phosphorus; while in the soil growing a 10-year,a 15-year,and a 23-year-old alfalfa crop,the change of fractionation of organic P is in the following order: moderate reliable organic phosphorous>moderate liable organic phosphorous>high reliable organic phosphorous>liable organic phosphorous.

Key words: Organic matter, Organic nitrogen, Inorganic phosphor, Organic phosphor

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