• 关键词：草场  退化  腐殖质  官能团  代换量

• 基金项目：

• 盛学斌
• 中国科学院生态环境研究中心,北京 100085

• 赵玉萍
• 中国农业大学,北京 100094

• 摘要：在未退化和已退化的草场进行围栏与不围栏的试验。结果表明,生物量的大小排序为：羊草围栏内>羊草围栏外,退化羊草围栏内>退化羊草围栏外,土壤氮、腐殖质、胡敏酸、富啡酸亦因生物量的增加而增加。其中,草场围栏内的胡敏酸及其官能团量增加显着。

• Abstract：Analyses were carried out to test biomass and soil samples in and outside sheep pasturing herb pens,on the normal and degraded grassfarms. The result shows that the amount of biomass at test sites ranges in such an ouder:in herb pens >outside herb pens > in degraded herb pens > outside degraded herb pens. The amount of nitrogin,humic substance,humic acid,and fulvic acid in the soils increases with increasing biomass,also following the above mentioned order. The content of humic acid and its functional groups in herb pen soils increases significantly and hence the pen soil is better in quality.

• Key words：grass farm  degradation  humic substance  functional groups  substitution amount.

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