放牧对草原生态系统不同气候区碳库影响的Meta分析

发布时间：2018-04-23 11:19

本文选题：放牧活动 + 草地生态系统　；参考：《草业学报》2016年10期

【摘要】：草原生态系统碳库变化对全球碳平衡有着重要作用。近年来,尽管在全球尺度上开展了大量关于放牧对草原生态系统碳循环影响的独立研究,但放牧活动对草原生态系统不同碳库影响的一般规律认识仍然存在广泛争议。本研究采用整合分析方法对全球105篇关于放牧干扰对草原生态系统碳循环影响的文献进行系统研究。结果表明,放牧活动显著减少了植物地上和地下以及相关碳库的大小,而对土壤呼吸通量有明显的促进作用;不同类型碳库在不同气候带上响应存在明显差别,放牧对半湿润/湿润区地下植物碳库和土壤碳库减少幅度分别为15.21%和15.35%,显著高于干旱/半干旱地区响应比;植物地上部分碳库与土壤碳库之间没有显著关系,而植物地下部分碳库与土壤碳库之间呈显著正相关;土壤碳库响应比与年平均降水量呈正相关关系,而与年平均温度呈显著负相关;植物地下碳库响应比与年平均降水量和年平均温度均呈现显著负相关关系;放牧活动不仅显著地减少了植物地上和地下以及相关碳库的大小,还改变了植物的碳库分配。
[Abstract]:The change of carbon pool in grassland ecosystem plays an important role in the global carbon balance. In recent years, although a large number of independent studies on the effects of grazing on the grassland ecosystem carbon cycle have been carried out on a global scale, the general understanding of the effects of grazing activities on different carbon pools in grassland ecosystems is still widely disputed. In this study, 105 papers on the effects of grazing disturbance on carbon cycle in grassland ecosystem were systematically studied by integrating analysis method. The results showed that grazing activities significantly reduced the size of plant aboveground, underground and related carbon pools, but significantly promoted soil respiration fluxes, and the responses of different types of carbon pools in different climatic zones were significantly different. The reduction of soil carbon pool and underground plant carbon pool were 15.21% and 15.35%, respectively, which were significantly higher than those in arid / semi-arid area, but there was no significant relationship between the aboveground carbon pool and soil carbon pool. The response ratio of soil carbon pool was positively correlated with the annual average precipitation, but negatively correlated with the annual average temperature, and there was a significant positive correlation between the carbon pool and the soil carbon pool, and a significant positive correlation between the soil carbon pool and the soil carbon pool. The response ratio of plant underground carbon pool was negatively correlated with annual average precipitation and annual average temperature, and grazing activities not only significantly reduced the size of plant aboveground, underground and related carbon pools, but also changed the carbon pool allocation of plants.
【作者单位】：江苏大学现代农业装备与技术教育部重点实验室;华东师范大学生态与环境科学学院;中国科学院地球化学研究所环境地球化学国家重点实验室;
【基金】：中国科学院“百人计划”择优项目国家自然科学基金(31070365) 江苏省高校优势学科[苏政办(2014)37号]资助
【分类号】：S812

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