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不同围封年限对退化大针茅草原生产力和土壤碳、氮贮量的影响

李强,杨劼**,宋炳煜,马文红,赵利清,张立欣,侯虹   

  1. (内蒙古大学生命科学学院生态学系, 呼和浩特 010021)
  • 出版日期:2014-04-10 发布日期:2014-04-10

The impacts of different enclosure durations on degraded Stipa grandis grassland productivity and soil carbon and nitrogen storage.

LI Qiang, YANG Jie**, SONG Bing-yu, MA Wen-hong, ZHAO Li-qing, ZHANG Li-xin, HOU Hong   

  1. (Department of Ecology, University of Inner Mongolia, Hohhot 010021, China)
  • Online:2014-04-10 Published:2014-04-10

摘要: 探讨了不同围封年限(6、8、30年)对大针茅草原生产力和土壤碳氮贮量的变化,以期构建围封年限与草地利用的关系,为草地管理提供科学依据。本实验通过实地样方调查及实验室分析,对不同围封年限大针茅草原群落的植被、土壤特征进行测定,分析了不同围封年限草原的生物量、土壤有机碳、氮贮量的恢复情况。结果表明:与持续自由放牧样地相比,围封后草原的生物量和土壤碳、氮贮量均呈显著增加;随着围封年限的延长,生物量和土壤碳、氮贮量也表现出增加的趋势,地上生物碳和土壤有机碳的增加趋于稳定。

关键词: 扁刺栲, 氮沉降, 根化学, 根序, 根形态

Abstract: In order to obtain relationship between grassland utilization and enclosure duration to provide a scientific basis for grassland management, this paper studied grassland productivity, soil organic carbon and total nitrogen storage. The vegetation and soil characteristics were determined, and the grassland biomass, soil organic carbon storage and total nitrogen storage were analyzed by field quadrat surveys and laboratory analysis. The results show that grassland biomass, soil carbon storage and total nitrogen storage were significantly increased after grazing exclusion compared with the continuous grazing grassland. With the extension of enclosure, the biomass, soil carbon storage and total nitrogen storage also showed an increasing trend, and the increments of biomass carbon and soil organic carbon gradually kept stable.

Key words: root branch order, Castanopsis platyacantha, root chemistry, nitrogen deposition, root morphology