近17 a阿克苏绿洲农田净碳汇功能的时空变化

doi:10.13866/j.azr.2022.04.30

Abstract

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 × 10⁴t in 2001 to 106.73 × 10⁴t 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

LI Yuanhang,HAO Xingming,ZHANG Jingjing,FAN Xue,ZHAO Zhuoyi. Spatial and temporal variation of net carbon sink function of farmland in Aksu oasis in the past 17 years[J].Arid Zone Research, 2022, 39(4): 1303-1311.

Figures/Tables 9

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References 36

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碳排放途径	碳排放系数	来源
氮肥（A₁）	1740.00 kg·kg^-1	[31]
磷肥（A₂）	165.09 kg·kg^-1	[32]
钾肥（A₃）	120.28 kg·kg^-1	[32]
复合肥（A₄）	380.97 kg·kg^-1	[32]
农药（B）	4.9341 kg·kg^-1	美国橡树岭国家实验室
农膜（C）	5.18 kg·kg^-1	南京农业大学农业资源与生态环境研究所
农田耕作（D）	16.47 kg·hm^-2	[32]
农业用电（F）	0.18 kg·kW^-1	政府间气候变化专门委员会
农业灌溉（G）	266.48 kg·hm^-2	[18]
柴油（J）	0.5927 g·kg^-1	政府间气候变化专门委员会
农田翻耕（H）	312.6 kg·hm^-2	[33]

年份	化肥	农膜	农药	农机	灌溉	柴油	翻耕	总和
2001	9.70	0.23	6.95	11.46	9.03	1.99	0.58	39.94
2002	9.54	0.21	6.29	12.11	8.78	2.20	0.56	39.69
2003	11.01	0.22	6.52	12.21	8.80	2.56	0.55	41.88
2004	11.64	0.25	7.35	12.25	8.62	2.90	0.55	43.55
2005	12.33	0.26	7.79	13.03	8.73	2.93	0.58	45.64
2006	14.00	0.33	8.76	12.77	8.97	3.16	0.60	48.58
2007	14.66	0.34	9.29	12.13	9.25	2.82	0.62	49.12
2008	16.97	0.30	12.24	15.62	11.78	3.07	1.31	61.30
2009	18.60	0.48	12.88	18.10	12.09	3.66	0.90	66.71
2010	20.00	0.53	14.13	17.89	13.04	4.01	0.94	70.55
2011	22.46	0.49	15.02	18.24	13.60	4.49	0.84	75.14
2012	21.95	0.50	15.32	18.72	13.49	4.82	0.94	75.73
2013	22.35	0.52	15.60	18.89	13.73	5.17	0.94	77.20
2014	26.24	0.63	19.89	25.62	15.88	6.05	1.01	95.32
2015	26.48	0.63	20.50	26.45	15.77	6.41	0.98	97.23
2016	29.41	1.18	21.26	27.70	17.49	6.57	0.95	104.56
2017	31.97	0.16	21.47	27.70	18.21	6.20	1.01	106.73

Spatial and temporal variation of net carbon sink function of farmland in Aksu oasis in the past 17 years

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