Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2022-09-26 Cooperative journals: 《干旱区研究》
Abstract： 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.
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