草地生态系统土壤有机碳储量及其分布特征

doi:10.3864/j.issn.0578-1752.2013.17.009

Abstract

Abstract: 【Objective】The distribution characteristics of soil organic carbon (SOC) storage were studied for the purpose to determine the reasonable grazing management way and provide a basis for the regional carbon estimation in grassland ecosystem. 【Method】The SOC storage of 0-100 cm soil depth was measured by using field method of stratified sampling in the typical steppe.【Result】The SOC storage was between 9.72-14.84 kg•m-2 in the three study plots. No significant difference was found in SOC storage in three study plots of spatial distance. The significant difference of SOC storage was found between four different grazing managements treatments in study area, and the order was moderate grazing (MG)＞light grazing (LG)＞heavy grazing (HG)＞control area (CK). The SOC storage decreased with the increasing of soil depth, and a significant difference was detected between SOC among different soil layers. A positive significant relationship was found between SOC storage and soil layer (P＜0.01), and the relationship could be described by using logarithmic and linear equations.【Conclusion】The SOC storage was relatively stable in the typical steppe, and presented a vertical descending characteristics. The effect of different grazing managements on SOC storage in the same vegetation type was significantly higher than the effect of spatial distance. Moderate grazing is benefit for carbon fixation of grassland ecosystem.

Key words: grassland ecosystem , grazing , enclosure , soil carbon storage , organic carbon vertical distribution

SA Ru-La-1, LI Jin-Xiang-2, HOU Xiang-Yang-1. Research on Soil Organic Carbon Storage Distribution in the Grassland Ecosystem[J].Scientia Agricultura Sinica, 2013, 46(17): 3604-3614.

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