文献类型：期刊文献

中文题名：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

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

作者：白云晓[1] 李晓兵[1,2] 王宏[1] 文菀玉[3] 李瑞华[1] 李国庆[1] 王涵[1]

第一作者：白云晓

机构：[1]北京师范大学资源学院;[2]地表过程与资源生态国家重点实验室北京师范大学;[3]中国林业科学研究院湿地研究所

年份：2015

卷号：0

期号：3

起止页码：311-321

中文期刊名：草业科学

外文期刊名：Pratacultural Science

收录：CSTPCD;;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：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)

语种：中文

中文关键词：草地退化;典型草原;植被-土壤系统;氮储量;DNDC模型

外文关键词：grassland degradation;;typical steppe;;plant-soil system;;nitrogen storage;;DNDC model

分类号：S812

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。
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( P < 0.05) with the grassland degradation aggravated.Compared with light degradation grassland( LD),soil nitrogen storage in moderate( MD) and heavy degradation grassland( HD) decreased by 7.74% and44.40%,respectively.However,the nitrogen storage in plants varied in opposite way which decreased in the following order: HD > MD > 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.