免耕和常规耕作农田生态系统冬季覆盖作物残茬分解和养分变化
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:


VARIATION OF NUTRIENT ELEMENTS OF WINTER COVER CROP RESIDUES IN AGROECOSYSTEMS UNDER NO TILLAGE AND CONVENTIONAL TILLAGE
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    免耕和常规耕作农田生态系统冬季覆盖作物红三叶草和黑麦草残体分解的格局和养分释放速率有明显区别.免耕地面残体养分释放和生物固定作用均缓于常规掩埋残体.常规耕作下,残体在掩埋后十天,C:N比值仍高时,红三叶草和黑麦草残体养分元素降低率,氮素分别为32.0%和52.0%、磷素为62.1%和78.3%、钾素为92.5%和91.2%、钙素为84.3%和61.2%、镁素为65.0%和75.2%.在分解早期,养分“损失”可能是由机械作用所加速的,如切碎、压榨、汁液外渗、扩散和淋洗作用等等.文中最后提出了减少残茬中早期养分过速“释放”的对策.

    Abstract:

    Quantitative studies on changes in C/N ratio,N,P,K.Ca and Mg contents of red clover and rye grass residues during decomposition in agroecosystems under no-tillage (NT) and conventional tillage (CT) were carried out in Horseshoe Bend,Ga,USA.Results showed that the decomposition patterns and mineralization rates of nutrients in the crop residues were different in the two ecosystems.Both the mineralization and biological immobilization of elements toolz place earlier in CT system than those in NT system.It was found that the amounts of nutrients elements remaining in residue,decreased rapidly in CT systems.

    参考文献
    相似文献
    引证文献
引用本文

吴珊眉,G. J. House,韩纯儒.免耕和常规耕作农田生态系统冬季覆盖作物残茬分解和养分变化[J].土壤学报,1986,23(3):204-211. Wu Shanmei, House G. J.,Han Chunru. VARIATION OF NUTRIENT ELEMENTS OF WINTER COVER CROP RESIDUES IN AGROECOSYSTEMS UNDER NO TILLAGE AND CONVENTIONAL TILLAGE[J]. Acta Pedologica Sinica,1986,23(3):204-211.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2013-02-25
  • 出版日期: