草地退化过程中典型草原氮储量的变化——以内蒙古锡林浩特市典型草原为例

白云晓; 李晓兵; 王宏; 文菀玉; 李瑞华; 李国庆; 王涵

doi:10.11829/j.issn.1001-0629.2014-0238

草地退化过程中典型草原氮储量的变化——以内蒙古锡林浩特市典型草原为例

基金项目:

国家重点基础研究发展计划项目（2014CB138803）；国家自然科学基金重点项目(41030535)；地表过程和资源生态国家重点实验室自由探索项目(2011-TDZY-102)

摘要: 以内蒙古自治区锡林浩特市为研究区，探讨了典型草原不同退化程度草地的植被-土壤系统氮储量的变化及差异，运用DNDC（Denitrification-Decomposition）模型对植被-土壤系统氮储量模拟并对结果进行了验证。结果表明，随着草地退化程度的加剧，土壤氮储量呈显著下降趋势（P<0.05），中度退化（MD）和重度退化（HD）样地较轻度退化（LD）样地土壤氮储量分别减少了7.74%和44.40%。不同退化程度样地的地上植物氮储量总体上呈现HD＞MD＞LD，与土壤氮储量的变化趋势相反；在生长季中，植物根系氮储量是逐渐增加的，且在生长季末表现为HD＞MD＞LD。植物-土壤系统中，土壤氮储量占总氮储量的比例高于根系和地上植物，占系统氮储量的95.05%~97.62%。DNDC模型在草原点位模拟土壤氮储量的效果比较好。

关键词:

草地退化；典型草原；植被-土壤系统；氮储量；DNDC模型

English

Nitrogen storage variations in typical steppe during grassland degradation progress——A case study of typical steppe in Xilin Hot City,Inner Mongolia

Received Date: 2014-05-11
Publish Date: 2015-03-19

Abstract: The variations of plant-soil system nitrogen storage in typical degraded steppe were measured in Xilin Hot City, Inner Mongolia. The values of plant-soil system nitrogen storage in different degraded grassland were also verified using DNDC(Denitrification-Decomposition) model. The results showed that soil nitrogen storage significantly reduced (PMD>LD. The nitrogen storage in roots gradually increased in the growing season and performed with the same order at the end of the growing season which was HD>MD>LD. The proportion of soil nitrogen storage in plant-soil system which ranged from 95.05% to 97.62% was higher than that of roots and plants nitrogen storage in plant-soil system. All of these results suggested that the DNDC model can accurately simulate the soil nitrogen storage in site in typical steppe.

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草地退化过程中典型草原氮储量的变化——以内蒙古锡林浩特市典型草原为例

English

Nitrogen storage variations in typical steppe during grassland degradation progress——A case study of typical steppe in Xilin Hot City,Inner Mongolia

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