吴旗沙打旺草地土壤水分及生产力特征的研究

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吴旗沙打旺草地土壤水分及生产力特征的研究

- 吴旗沙打旺草地土壤水分及生产力特征的研究
- Bulletin of Soiland Water Conservation Vol. 9, Issue 6, Pages: 113-118(1990)
- 作者机构：
  
  中国科学院水利部西北水土保持研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：1990
- 稿件说明：
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[J]. Bulletin of Soiland Water Conservation, 1990, 9(6): 113-118.
DOI：

[J]. Bulletin of Soiland Water Conservation, 1990, 9(6): 113-118. DOI：

摘要

本研究主要在吴旗飞播沙打旺草地

由播种第2年到完全衰败后3、4年的十三四年间

土壤水分和产草量实测资料的基础上

论述了在黄土高原半干旱区沙打旺草地土壤水分和生产力特征。沙打旺草地2～9年的产草量是同期封禁天然草地的7.6倍

而总耗水量仅为1.1倍。可见沙打旺草地使大量降水和土壤储水变为有效水用于干物质生产。沙打旺草地在生长旺盛的3～7年

根系不断下伸

使5～8m深层储水降至4%～5%

加剧了深土层水分亏缺

第8～9年后随着沙打旺衰败

土壤水分呈逐渐恢复趋势。衰败3～4年2～3m土层水分可以得到恢复

加之土壤肥力提高

所以衰败沙打旺草地中天然草类繁茂

产草量为对照荒山草地的1.6～3.2倍。文章最后提出了沙打旺合理的种植、利用方式。

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