The effects of fencing on carbon stocks in the degraded alpine grasslands of the Qinghai-Tibetan Plateau
The effects of fencing on carbon stocks in the degraded alpine grasslands of the Qinghai-Tibetan Plateau
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DOI：
10.1016/j.jenvman.2013.05.058
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发表时间：
2013-10-15
影响因子：
8.7
通讯作者：
Wu, Yu
中科院分区：
文献类型：
--
作者：
Li, Yuanyuan;Dong, Shikui;Wu, Yu
量化不同管理策略下草地的碳储量有助于我们了解生态系统对不同土地管理措施的响应。为了评价土壤微生物量碳循环及其重要性，对青藏高原不同放牧强度和不同管理策略(围栏和非围栏)的土壤有机碳、地上和地下生物量碳和土壤微生物量碳水平进行了测定。我们还计算了土壤微生物量碳与土壤有机碳的比值，作为土壤有机质有效性和质量的指标。结果表明，退化对土壤有机碳、生物量碳和微生物量碳有显著影响(P<；0.05)。而围栏只对未退化草地和中度退化草地有显著影响(P<；0.05)。土壤微生物量碳水平与土壤生物量碳、土壤有机碳呈正相关。研究表明，土壤微生物量碳水平对高寒草地的碳循环起着至关重要的作用，围栏可能是青藏高原轻度或中度退化草地恢复的重要管理策略。(C)2013爱思唯尔有限公司。保留所有权利。
Quantifying the carbon storage of grasslands under different management strategies can help us understand how this ecosystem responds to different land management practices. To assess the C cycle and the importance of soil microbial biomass carbon, we measured the levels of soil organic carbon, biomass carbon (above- and underground) and soil microbial biomass carbon in areas with different grazing intensities and different management strategy (fenced and unfenced) in the Qinghai-Tibetan Plateau. We also calculated the ratio of soil microbial biomass carbon to soil organic carbon as an indicator of the soil organic matter availability and quality. Results showed that degradation had significant effects on the soil organic carbon, biomass carbon and microbial biomass carbon (P < 0.05). However, fencing only had a significant effect on the non-degraded and moderately degraded grasslands (P < 0.05). We also found that the level of soil microbial biomass carbon was positively correlated with the biomass carbon and soil organic carbon. From our research, we concluded that the level of soil microbial biomass carbon was crucial to the C cycle in the alpine grasslands and that fencing may be an important management strategy for restoring lightly or moderately degraded grassland in the Qinghai-Tibetan Plateau. (C) 2013 Elsevier Ltd. All rights reserved.