Interannual Variations of Carbon Absorption and Emission of Farmland Ecosystem in Tianjin

doi:10.11924/j.issn.1000-6850.casb2022-0424

Abstract

Abstract:

Based on the statistics of main crop yield, commonly cultivated area, effective irrigation area, and the application amount of fertilizers, pesticides, agricultural film and diesel oil in Tianjin farmland ecosystem from 2010 to 2020, we estimated the carbon absorption and emission, in order to provide reference data for carbon sequestration and emission reduction in Tianjin farmland. The results indicated that the total carbon absorption of Tianjin farmland ecosystem was relatively stable from 2010 to 2020, with an annual average of 4.34 million tons. Among food crops, maize and wheat accounted for the highest proportion of carbon absorption, and showed a gradual increasing tendency. The total carbon emissions from farmland decreased year by year, from 328800 tons in 2010 to 142500 tons in 2020, with a total decrease of about 57%. Among the carbon emission sources, fertilizers accounted for the highest proportion of carbon emission, and basically decreased year by year. Diesel and agricultural film were the second largest emission source after fertilizers, and their carbon emissions decreased year by year. The carbon absorption of Tianjin farmland ecosystem was significantly higher than the carbon emission, indicating that the ecosystem had a strong carbon sink function. The annual change of the net carbon sink was not significant, with an annual average of 4.08 million tons.

Key words: farmland ecosystem, carbon absorption, carbon emission, carbon sink, Tianjin

LI Mengqi, ZHANG Hui, ZHAO Jie, WANG Liyan, DONG Yuchen, XIAO Hui. Interannual Variations of Carbon Absorption and Emission of Farmland Ecosystem in Tianjin[J]. Chinese Agricultural Science Bulletin, 2023, 39(14): 159-164.

Figures/Tables 7

References 21

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主要农作物	经济系数	碳吸收率
小麦	0.40	0.4853
玉米	0.40	0.4709
水稻	0.45	0.4144
棉花	0.10	0.4500
蔬菜	0.65	0.4500

主要农作物	经济系数	碳吸收率
小麦	0.40	0.4853
玉米	0.40	0.4709
水稻	0.45	0.4144
棉花	0.10	0.4500
蔬菜	0.65	0.4500

年份	玉米	小麦	水稻	棉花	蔬菜	总量
2010	109.40	63.84	10.31	27.18	238.11	448.85
2011	111.39	64.68	9.85	31.05	233.09	450.06
2012	109.17	66.32	10.31	24.48	230.25	440.53
2013	120.67	67.89	11.88	20.43	222.73	443.60
2014	119.84	69.41	11.14	15.93	214.36	430.69
2015	126.93	70.44	10.41	10.58	195.73	414.08
2016	139.73	71.46	18.42	9.45	189.99	429.05
2017	140.43	75.72	24.22	11.16	186.65	438.19
2018	130.14	69.31	34.44	8.24	175.83	417.97
2019	135.60	73.37	39.51	8.15	168.08	424.69
2020	129.14	76.26	46.23	4.59	184.48	440.71

年份	玉米	小麦	水稻	棉花	蔬菜	总量
2010	109.40	63.84	10.31	27.18	238.11	448.85
2011	111.39	64.68	9.85	31.05	233.09	450.06
2012	109.17	66.32	10.31	24.48	230.25	440.53
2013	120.67	67.89	11.88	20.43	222.73	443.60
2014	119.84	69.41	11.14	15.93	214.36	430.69
2015	126.93	70.44	10.41	10.58	195.73	414.08
2016	139.73	71.46	18.42	9.45	189.99	429.05
2017	140.43	75.72	24.22	11.16	186.65	438.19
2018	130.14	69.31	34.44	8.24	175.83	417.97
2019	135.60	73.37	39.51	8.15	168.08	424.69
2020	129.14	76.26	46.23	4.59	184.48	440.71

年份	氮肥	磷肥	钾肥	复合肥	农药	农膜	柴油	灌溉	总量
2010	10.12	0.64	0.19	2.93	1.83	6.22	10.08	0.86	32.88
2011	9.78	0.64	0.20	2.82	1.87	6.51	9.42	0.85	32.09
2012	9.52	0.66	0.20	2.93	1.88	6.42	9.48	0.84	31.94
2013	9.60	0.63	0.22	2.90	1.79	6.68	9.07	0.77	31.66
2014	9.09	0.58	0.20	2.86	1.80	6.36	9.07	0.77	30.72
2015	8.58	0.53	0.18	2.70	1.74	5.47	9.19	0.77	29.15
2016	7.72	0.48	0.18	3.16	1.63	6.03	8.83	0.77	28.80
2017	5.66	0.38	0.18	2.90	1.16	5.65	8.30	0.76	24.99
2018	4.80	0.33	0.16	3.05	1.08	4.70	1.30	0.76	16.18
2019	4.54	0.31	0.14	2.97	1.07	4.19	1.24	0.76	15.25
2020	4.20	0.31	0.14	2.78	0.98	3.90	1.19	0.75	14.25