草地生态管理下内蒙古草地土壤有机碳库动态研究

doi:10.19741/j.issn.1673-4831.2020.0170

Abstract

Abstract: In order to explore the dynamic changes of soil organic carbon pool under the grassland ecological management and evaluate the effect of grassland ecological construction and grassland carbon cycle scientifically, Inner Mongolia grassland was taken as the research area, based on IPCC Tier 2. Carbon budget list method. The dynamic change of grassland area in Inner Mongolia from 2001 to 2015 was analyzed, and the surface soil organic carbon reserves of different types of grassland (temperate meadow grassland, temperate typical grassland and temperate desert grassland) in Inner Mongolia under the implementation of different management measures (grazing prohibition, rest grazing, rotation grazing, fencing, improvement, grass planting) was estimated. The results show that: (1) From 2001 to 2015, the dynamic changes of grassland area in Inner Mongolia were not consistent. The overall active area increased significantly with time (P<0.01). (2) Soil carbon sequestration rate changed under different grassland management measures. Soil carbon sequestration rate showed a significant increase under grazing prohibition and grazing cessation (P<0.05) and grassland management measures promoted soil carbon sequestration. (3) From 2001 to 2015, Inner Mongolia grassland showed a carbon sink on the whole. Meta-analysis was used to determine the range of soil organic carbon under different grassland management measures. The average change rate of soil organic carbon was (473.70±53.93)×10⁴ t·a^-1. Soil carbon sequestration rates of different grassland types increased and the annual variation of typical grassland was the largest, with an average of (174.22±74.70)×10⁴ t·a^-1. Inner Mongolia grassland ecosystem has great carbon sink potential and will play a greater role in global carbon balance in the future. Grassland ecological management has effectively improved soil organic carbon sink rate, which is not only conducive to the ecological protection of northern grasslands, but also provides a guarantee for China's ecological, economic and social benefits.

Key words: management measures, Inner Mongolia grassland, organic carbon reserves, Meta-analysis

CLC Number:

LUO Wen-rong, HU Guo-zheng, GAO Qing-zhu. Dynamic Study on Soil Organic Carbon Reservoir in Inner Mongolia Grassland Under Grassland Ecological Management[J]. Journal of Ecology and Rural Environment, 2020, 36(12): 1588-1597.

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Dynamic Study on Soil Organic Carbon Reservoir in Inner Mongolia Grassland Under Grassland Ecological Management

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