植物生态学报 ›› 2018, Vol. 42 ›› Issue (3): 327-336.DOI: 10.17521/cjpe.2017.0067

所属专题: 碳循环

• 研究论文 • 上一篇    下一篇

围封对内蒙古典型草原与荒漠草原植被-土壤系统碳密度的影响

闫宝龙,王忠武*(),屈志强,王静,韩国栋*()   

  1. 内蒙古农业大学草原与资源环境学院, 呼和浩特 010019
  • 出版日期:2018-03-20 发布日期:2018-03-27
  • 通讯作者: 王忠武,韩国栋
  • 基金资助:
    中国科学院战略性先导科技专项(XDA05050402-6);国家重点研发计划(2016YFC0500504);内蒙古自治区重大科技专项和中国科学院西部之光项目

Effects of enclosure on carbon density of plant-soil system in typical steppe and desert steppe in Nei Mongol, China

YAN Bao-Long,WANG Zhong-Wu*(),QU Zhi-Qiang,WANG Jing,HAN Guo-Dong*()   

  1. College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Huhhot 010019, China
  • Online:2018-03-20 Published:2018-03-27
  • Contact: Zhong-Wu WANG,Guo-Dong HAN
  • Supported by:
    Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA05050402-6);the National Key Research and Development Project of China(2016YFC0500504);the Science and Technology Projects in Inner Mongolia Autonomous Region and West Light Foundation of Chinese Academy of Sciences.

摘要:

草地生态系统是巨大的碳库, 在全球碳循环中起着重要的作用。该研究以内蒙古中温带草地区典型草原和荒漠草原为研究对象, 测定了两种草原类型围封与放牧后地上生物量碳密度、地下生物量碳密度和土壤碳密度, 探讨围封对两种草原类型植被-土壤系统碳密度的影响。结果表明: (1)围封显著地增加了典型草原地上和地下生物量的碳密度, 对荒漠草原地上生物量碳密度增加影响显著, 对地下生物量碳密度增加影响不显著; (2)围封显著地增加了典型草原土壤碳密度, 使荒漠草原土壤碳密度有增加的趋势, 但影响不显著; (3)典型草原围封样地地下生物量和土壤碳密度的垂直分布显著高于放牧样地, 而荒漠草原围封样地地下生物量和土壤碳密度的垂直分布与放牧样地的差异不显著; (4)围封分别提高了典型草原和荒漠草原植被-土壤系统碳密度的2.2倍和1.6倍, 典型草原和荒漠草原分别有超过65%和89%的碳储存在土壤中, 两种草原类型的地下生物量碳库均占总生物量碳库的90%以上。研究结果表明围封能够有效地增加草原生态系统的碳储量。

关键词: 围封, 典型草原, 荒漠草原, 碳密度, 垂直分布

Abstract:

Aims As an immense carbon (C) stock, grassland ecosystem plays a crucial role in global C cycling. The objective of this research was to reveal the effects of enclosure on C density of the plant-soil system by comparing the aboveground biomass (AGB), belowground biomass (BGB) and soil C density in enclosure plots with those in grazing plots in the typical steppe (TS) and desert steppe (DS) in Nei Mongol, China.

Methods At each of the 19 study sites, we set up a 100 m × 100 m plot and 5 quadrats (1 m × 1 m) along the diagonal transect within each plot. At each quadrat, AGB was harvested first and then a soil core (0-100 cm depth, 7 cm inner diameter) was taken for BGB and soil C content measurement. Each soil core was divided into 7 depth increments (0-5 cm, 5-10 cm, 10-20 cm, 20-30 cm, 30-50 cm, 50-70 cm, 70-100 cm).

Important findings (1) Enclosure significantly increased C density of AGB and BGB in TS. In DS, enclosure significantly increased C density of AGB, but had no significant effect on the C density of BGB. (2) Enclosure significantly increased soil C density in TS, but had no significant impact in DS although there was an increasing trend. (3) For all increments along the soil profile, enclosure significantly increased BGB and soil C density compared to grazing plots in TS, but this effect was not found in DS. (4) Enclosure increased C density of the plant-soil system by 2.2 and 1.6 times in TS and DS, respectively. 65% and 89% C was stored in soil in TS and DS, respectively, and BGB C stock accounted for more than 90% of total biomass C in both TS and DS. Enclosure is an effective approach to improve C sequestration in grassland ecosystems.

Key words: enclosure, typical steppe, desert steppe, carbon density, vertical distribution