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李明琦,刘世梁,武雪,孙永秀,侯笑云,赵爽.云南省农田生态系统碳足迹时空变化及其影响因素.生态学报,2018,38(24):8822~8834 本文二维码信息
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云南省农田生态系统碳足迹时空变化及其影响因素
Temporal and spatial dynamics in the carbon footprint and its influencing factors of farmland ecosystems in Yunnan Province
投稿时间:2018-05-30  修订日期:2018-11-05
DOI: 10.5846/stxb201805301190
关键词云南农田生态系统  碳排放  碳吸收  碳足迹
Key WordsYunnan farmland ecosystem  carbon emission  carbon absorption  carbon footprint
基金项目国家重点研发计划项目(2016YFC0502103);国家自然科学基金(41571173)
作者单位E-mail
李明琦 北京师范大学环境学院水环境模拟国家重点实验室, 北京 100875  
刘世梁 北京师范大学环境学院水环境模拟国家重点实验室, 北京 100875 shiliangliu@bnu.edu.cn 
武雪 北京师范大学环境学院水环境模拟国家重点实验室, 北京 100875  
孙永秀 北京师范大学环境学院水环境模拟国家重点实验室, 北京 100875  
侯笑云 北京师范大学环境学院水环境模拟国家重点实验室, 北京 100875  
赵爽 北京师范大学环境学院水环境模拟国家重点实验室, 北京 100875  
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摘要:
农田碳足迹研究对农田生态系统管理与农业可持续发展具有重要意义,也可表征农田扩展的生态影响程度。利用县域尺度统计数据与空间分析,对云南省农田生态系统近30年的碳足迹的时空演变进行研究。结果表明:1985-2015年期间,云南省农田生态系统碳排放年均增幅为13.9%,化肥施用引起的碳排放贡献率最大,为56%,2015年的化肥单位面积碳排放达到331.6 kg/hm2。云南省农田生态系统碳吸收年均增幅为3.04%,稻谷的碳吸收比例最大,为41%,然而,玉米的碳吸收的增幅最大,为8.76%。云南省农田生态系统存在碳生态盈余,且碳足迹总体呈现增长趋势,年均增长率为16.8%,单位面积碳足迹随年份增加不断增长。从空间上看,云南省农田生态系统碳排放、碳吸收在空间上均呈东南高、西北低的分布格局,而碳足迹在空间上呈现东西部高、中部低的分布格局,三者的空间差异和变化幅度差异都较大。
Abstract:
The study of farmland carbon footprint is of great significance to farmland ecosystem management and sustainable agricultural development. It can also characterize the ecological effects of farmland expansion. Based on the county-scale statistical data and spatial analysis, we studied the temporal and spatial changes of the carbon footprint of the Yunnan farmland ecosystem over the past 30 years. The results showed that:during the period from 1985 to 2015, the average annual increase of carbon emissions from farmland ecosystems in Yunnan Province was 13.9%. The contribution of carbon emissions from chemical fertilizer was the largest, accounting for 56%. In 2015, the carbon emissions per unit area reached 331.6 kg/hm2. The average annual increase rate of carbon absorption of farmland ecosystems in Yunnan Province was 3.04%. Rice had the largest proportion of carbon absorption, accounting for 41% of the total carbon absorption, whereas corn had the fastest growth rate of carbon absorption at 8.76%. There was a carbon surplus in farmland ecosystems in Yunnan Province. Furthermore, the overall carbon footprint showed a growing trend with the average annual growth rate of 16.8%, and the carbon footprint per unit area increased continuously. From the spatial point of view, the carbon emission and carbon absorption of farmland ecosystems in Yunnan Province had similar spatial distributions, which appeared more in the southeast and less in the northwest. However, the carbon footprint was spatially distributed more in the east and west and less in the middle. Their most obvious features were large regional differences and variation range.
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