2001—2024年锡林郭勒盟草原净初级生产力时空特征及对影响因子的响应

doi:10.12118/j.issn.1000-6060.2024.759

Abstract

Abstract:

CO₂ emission reduction is a globally shared concern today, and the voluntary carbon offset (or sequestration increase) market for natural ecosystems, along with its operational models, holds immense development potential. As one of the key natural carbon sinks, grasslands have received widespread attention. This study focuses on the Xilin Gol League in Inner Mongolia of China as the research area, utilizing the Google Earth Engine platform to obtain MODIS data, meteorological reanalysis data, and vegetation coverage data. Based on the Carnegie-Ames-Stanford approach (CASA) model, the spatiotemporal dynamics of grassland net primary productivity (NPP) from 2001 to 2024 in Xilin Gol League were analyzed. The study investigates the impact of land cover change and climate change on grassland NPP through land use dynamics, partial correlation, and contribution index methods, providing a reference for achieving carbon peak and carbon neutrality goals in the region. The results indicate that: (1) From 2001 to 2024, grassland NPP in Xilin Gol League showed a fluctuating upward trend, with a multi-year average of 302.86 g C∙m^-2∙a^-1 The annual NPP distribution displayed a trend of gradual decrease from the northeast to the southwest. (2) The grassland NPP in Xilin Gol League was mainly driven by changes in land use and climate, with a minor influence from geographic factors, with precipitation having the greatest contribution, reaching 0.84. (3) Over the years, the impact of climate change on grassland NPP gradually outweighed that of land use change, especially in meadow steppe, typical steppe, and desert steppe, where contribution values reached 96.01%, 63.97%, and 93.05%, respectively.

Key words: net primary productivity, climate change, influencing factors, CASA model, MODIS data, Xilin Gol League

ZHANG Fei, LI Jian, LI Huirong, XIE Tao, ZHANG Xuehong, WANG Chao, BAI Shuying, SONG Zhengshan. Spatiotemporal characteristics of net primary productivity and its response to influencing factors in Xilin Gol League grassland from 2001 to 2024[J].Arid Land Geography, 2025, 48(9): 1555-1566.

Figures/Tables 14

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β	Z	趋势类别	趋势特征
β>0	Z>1.96	2	显著增加
β>0	0<Z≤1.96	1	不显著增加
β=0	Z=0	0	稳定不变
β<0	0<Z≤1.96	-1	不显著减少
β<0	Z>1.96	-2	显著减少

土地利用类型	面积/km²
土地利用类型	草甸草原	城镇用地	典型草原	荒漠草原	林地	裸地	农田	水体	总计
草甸草原	15672.9	1003.4	11530.6	49.7	495.7	-	4174.7	190.3	33117.3
城镇用地	471.0	1976.4	1627.3	1987.4	1.4	5.7	106.9	448.8	6624.9
典型草原	18646.4	4768.7	46080.1	6849.3	25.7	8.8	3381.9	180.5	79941.3
荒漠草原	7544.5	3526.1	5067.5	47505.0	9.3	2364.0	11.8	501.7	66529.8
林地	154.7	0.7	8.5	1.0	220.7	-	99.9	3.1	488.4
裸地	19.1	-	5.9	1111.8	-	2139.9	-	6.5	3283.1
农田	2178.7	225.2	4685.8	10.8	14.2	-	2347.5	16.7	9478.8
水体	2.8	99.0	12.4	5.7	14.5	-	44.3	603.6	782.2
总计	44689.9	11599.4	69018.1	57520.6	781.5	4518.4	10166.9	1951	200245.8

土地利用类型	面积/km²
土地利用类型	草甸草原	城镇用地	典型草原	荒漠草原	林地	裸地	农田	水体	总计
草甸草原	14692.3	169.3	20221.4	5803.3	167.5	213.6	2782.8	639.7	44689.8
城镇用地	1065.1	1277.4	4658.8	3468.0	-	13.2	320.7	796.2	11599.4
典型草原	10568.5	784.8	50028.7	3815.6	-	14.7	1821.1	1983.2	69016.6
荒漠草原	369.7	316.0	4230.2	45573.1	0.3	6855.6	22.2	154.2	57521.2
林地	141.5	0.7	30.8	1.5	389.4	-	190.7	27.2	781.8
裸地	2.9	-	24.1	975.5	-	3515.6	-	-	4518.1
农田	3806.0	73.5	1897.8	1.4	146.5	-	3812.3	428.5	10166.0
水体	153.6	95.4	218.8	366.1	15.1	18.9	64.1	1019.1	1951.2
总计	30799.6	2717.0	81310.5	60004.4	718.8	10631.5	9014.0	5048.2	200244.0

土地利用类型	NPP均值/g C∙m^-2∙a^-1			NPP变化值/g C∙m^-2∙a^-1
土地利用类型	2001年	2010年	2020年	2001—2010年	2010—2020年
草甸草原	540.35	417.33	582.08	-123.02	164.75
典型草原	261.50	296.74	367.50	35.24	70.76
荒漠草原	111.67	135.84	178.05	24.17	42.21
其他用地	242.67	277.46	315.44	34.79	37.98

土地利用类型	影响因素	2001— 2010年	2010— 2020年	2001— 2024年
草甸草原	气候变化	26.35	37.46	96.01
草甸草原	土地利用变化	64.44	50.88	2.89
典型草原	气候变化	33.00	10.74	63.97
典型草原	土地利用变化	62.48	87.34	26.40
荒漠草原	气候变化	58.00	76.79	93.05
荒漠草原	土地利用变化	33.45	19.89	4.61
水体	气候变化	23.22	18.84	25.20
水体	土地利用变化	42.05	51.13	18.62
林地	气候变化	23.13	76.17	22.40
林地	土地利用变化	62.97	19.89	72.83
农田	气候变化	33.30	55.36	21.19
农田	土地利用变化	64.26	38.34	59.44
城镇用地	气候变化	22.28	74.21	40.51
城镇用地	土地利用变化	60.97	40.31	31.68
裸地	气候变化	36.07	10.80	9.46
裸地	土地利用变化	50.35	74.57	67.14

Spatiotemporal characteristics of net primary productivity and its response to influencing factors in Xilin Gol League grassland from 2001 to 2024

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