草地学报

›› 2009, Vol. 17 ›› Issue (3): 288-293.DOI: 10.11733/j.issn.1007-0435.2009.03.005

• 研究论文 • 上一篇    下一篇

黄土高原长期种植苜蓿对土壤硫、钙、镁的影响

危锋1,2, 郝明德1   

  1. 1. 中国科学院水利部水土保持研究所, 陕西杨凌, 712100;
    2. 中国科学院研究生院, 北京, 100049
  • 收稿日期:2008-09-26 修回日期:2009-02-13 出版日期:2009-06-15 发布日期:2009-06-15
  • 通讯作者: 郝明德,E-mail:haodong@public.xa.sn.cn
  • 作者简介:危锋(1978- ),男,陕西汉中人,博士研究生,研究方向为土壤养分循环与平衡,E-mail:weifeng6688@126.com
  • 基金资助:
    中国科学院知识创新工程重要方向项目(kzcx2-yw-424-3);国家重点基础研究发展计划(2005CB121101);国家科技支撑计划(2006BAD05B07)资助

Effect of Long-term Alfalfa Succession on Soil Sulfur,Calcium,and Magnesium in the Loess Plateau

WEI Feng1,2, HAO Ming-de1   

  1. 1. Institute of Soil and Water Conservation, CAS and MWR, Yangling, Shaanxi Province 712100, China;
    2. Graduate School, CAS, Beijing 100049, China
  • Received:2008-09-26 Revised:2009-02-13 Online:2009-06-15 Published:2009-06-15

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摘要： 以22年定位试验为基础,研究黄土高原长期种植紫花苜蓿(Medicago sativa L.)情况下土壤硫、钙、镁组分的变化。结果表明:长期施P使苜蓿连作耕层土壤总硫、有效硫、水溶性硫、吸附性硫、HCl可溶性硫、总无机硫和有机硫含量分别增加9.41%、62.41%、47.51%、30.07%、2.25%、5.38%和17.54%;长期施NPM使苜蓿连作耕层土壤总硫、有效硫、水溶性硫、吸附性硫、HCl可溶性硫、总无机硫和有机硫含量分别增加20.89%、98.31%、68.44%、57.34%、8.07%、12.54%和37.69%。长期施P使苜蓿连作耕层土壤全钙、有效钙、水溶态钙、交换态钙和酸溶态钙含量增加分别增加4.64%、4.27%、11.66%、4.05%和8.59%,但残余态钙含量降低2.21%;长期施NPM使苜蓿连作耕层土壤全钙、有效钙、水溶态钙、交换态钙和酸溶态钙含量增加分别增加8.69%、8.30%、51.59%、6.73%和27.77%,但残余态钙含量降低26.23%。长期施NPM使苜蓿连作耕层土壤全镁、有效镁、水溶态镁、交换态镁、酸溶态镁和残余态镁含量分别增加7.38%、61.98%、63.16%、61.85%、5.81%和8.97%。此外,有效硫在土壤剖面上出现双累积峰,有向深层土壤迁移的特征;有效钙、有效镁在土壤剖面上存在淋溶累积现象。此研究结果可为苜蓿种植和管理提供依据。

关键词: 黄土高原, 苜蓿连作, 硫、钙、镁, 长期试验

Abstract: Sulfur,calcium,and magnesium are essential elements in plant and play very important functions in physiology and plant nutrition.Based on the long-time stationary experiment,the changes of soil sulfur,calcium and magnesium were studied under a condition of 22-year alfalfa succession in Loess Plateau.The results show that the contents of total sulfur,available sulfur,water soluble sulfur,adsorbent sulfur,HCl soluble sulfur,total inorganic sulfur,and organ sulfur in tilth soils,after long-time P-fertilizer application,increased by 9.41%,62.41%,47.51%,30.07%,2.25%,5.38%,and 17.54%,respectively.The contents of total sulfur,available sulfur,water soluble sulfur,adsorbed sulfur,HCl soluble sulfur,total inorganic sulfur,and organic sulfur in tilth soils,after long-time NPM-fertilizer application,increased by 20.89%,98.31%,68.44%,57.34%,8.07%,12.54%,and 37.69%,respectively.The contents of total calcium,available calcium,water soluble calcium,exchangeable calcium,and HCl soluble calcium in tilth soils,after long-time P-fertilizer application,increased by 4.64%,4.27%,11.66%,4.05%,and 8.59%,respectively,but the content of residual calcium decreased by 2.21%.The contents of total calcium,available calcium,water soluble calcium,exchangeable calcium,and HCl soluble calcium in tilth soils,after long-time NPM-fertilizer application,increased by 8.69%,8.30%,51.59%,6.73%,and 27.77%,respectively,but the content of residual calcium decreased by 26.23%.The contents of total magnesium,available magnesium,water soluble magnesium,exchangeable magnesium,HCl soluble magnesium,and residual magnesium in tilth soils,after long-time NPM-fertilizer application,increased by 7.38%,61.98%,63.16%,61.85%,5.81%,and 8.97%,respectively.Two peaks of available sulfur in soil profiles were detected with a transportation trend of available sulfur to deep soil layers.Additionally,the eluviation and accumulation of available calcium and magnesium occurred in soil profiles.

Key words: Loess Plateau, Alfalfa succession, Sulfur,calcium,and magnesium, Long-term experiment

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