近17 a阿克苏绿洲农田净碳汇功能的时空变化
收稿日期: 2021-12-10
修回日期: 2022-01-19
网络出版日期: 2022-09-26
基金资助
西部之光交叉团队项目(028410101);国家自然科学基金项目(U1903114)
Spatial and temporal variation of net carbon sink function of farmland in Aksu oasis in the past 17 years
Received date: 2021-12-10
Revised date: 2022-01-19
Online published: 2022-09-26
基于阿克苏地区2001—2017年遥感、气象资料以及农业投入等相关统计数据估算了阿克苏绿洲农田的净碳汇量。结果表明：（1） 近17 a,阿克苏绿洲农田净生态系统生产力（Net Ecosystem Productivity,NEP）呈逐年上升的趋势,整体在空间分布上较为均匀,较高值主要集中在温宿县的南部、阿克苏市的中部及新和、库车、沙雅三县的交汇处。（2） 农业生产投入碳排放量从2001年的39.94×104 t增长至2017年的106.73×104 t,年均增长率为25.14%,空间分布呈东南高、西北低的分布格局。（3） 近17 a,阿克苏绿洲农田的净碳汇量呈波动上升趋势,空间上呈自西北向东南逐渐增加的特点。总体而言,阿克苏绿洲农田具有较强的净碳汇能力,但各县市绿洲农田净碳汇量区域差异明显,可通过优化田间管理、减少农业生产碳排放等措施,提高绿洲农田的净碳汇能力。
李远航,郝兴明,张静静,范雪,赵卓怡 . 近17 a阿克苏绿洲农田净碳汇功能的时空变化[J]. 干旱区研究, 2022 , 39(4) : 1303 -1311 . DOI: 10.13866/j.azr.2022.04.30
Studying the spatial and temporal variations of the net carbon sink function of oasis farmland is important for its management and sustainable development. The net carbon sink of Aksu oasis farmland was estimated on the basis of remote sensing, meteorological data and agricultural inputs, and other related statistics from 2001 to 2017. The following results are presented. (1) In the past 17 years, the net ecosystem productivity (NEP) of oasis farmland in Aksu showed an increasing trend yearly, with an average annual growth rate of 7.43%. Among which, the area of oasis farmland with a significant increasing trend of NEP was 1.44 × 104 km2, accounting for 97.7% of its total area, which is mainly distributed in various counties and cities. The area with a significant decreasing trend was 339 km2, accounting for 2.3% of the total area, mainly in the oasis areas of Wensu, Awati, Aksu, and Kuche counties. (2) Carbon emissions from agricultural production inputs increased from 39.94 × 104 t in 2001 to 106.73 × 104 t in 2017, with an average annual growth rate of 25.14% and high and low distribution patterns in the Southeast and Northwest, respectively, considering spatial distribution. The largest proportions of agricultural production input pathways are fertilizer and agricultural machinery at 28% and 26%, respectively. (3) From 2001 to 2017, the net carbon sink of Aksu oasis farmland showed a fluctuating upward trend, spatially demonstrating a gradual increase from Northwest to Southeast, with high values mainly distributed in the southwestern part of Wensu county, the western part of Aksu City, the entire territory of Alar City, and the eastern part of Xinhe County. Overall, Aksu oasis farmland has a high net carbon sink capacity. However, regional differences are found in the net carbon sinks of oasis farmland among counties and cities. Thus, the net carbon sink capacity of oasis farmland should be improved by optimizing the agricultural industry structure and enhancing farming measures.
Key words： NEP; oasis; farmland; carbon emission; net carbon sink; Aksu
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