Spatial and temporal variation of grassland NPP and its driving forces in Inner Mongolia

doi:10.7522/j.issn.1000-694X.2021.00074

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (5): 130-139.DOI: 10.7522/j.issn.1000-694X.2021.00074

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Spatial and temporal variation of grassland NPP and its driving forces in Inner Mongolia

Yongchun Hua(), Rula Sa, Bing Wang()

College of Forestry，Inner Mongolia Agriculture University，Hohhot 010019，China

Received:2021-04-19 Revised:2021-06-21 Online:2021-09-20 Published:2021-09-23
Contact: Bing Wang

Abstract

Abstract:

Net primary production（NPP）and its driving force analysis is one of the key issues in global change research. Based on GIMMS NDVI3g， ERA5 meteorological and grassland type data， annual grassland NPP was generated by CASA model. Taking grass of Inner Mongolia as the research object， the change trend of grassland NPP （1982-2015） were analyzed by using the trend analysis， partial correlation， multiple correlation and residual analysis， and the impact of climate factors and human activities on the NPP change was quantitatively determined. The results showed that：（1） From 1982 to 2015， the grassland area with extremely significant （P<0.01） and significant （P<0.05） NPP increase accounted for 8.83% and 24.01% of the total area of the study area； while the area with extremely significant （P<0.01） and significant （P<0.05） decrease accounted for 4.26% and 8.08%. The area of NPP increase was greater than the area of decrease， showing the grassland in recovery state. （2） 92.87% of the area in the study area showed a good correlation of NPP with climate factors. The temperature driving， precipitation driving and composite driving of precipitation and temperature accounted for 2.06%， 70.71% and 20.11% of the total area， respectively. The impact of climate change on the three grasslands was desert steppe > typical steppe > meadow steppe. （3） Human activities also had a great impact on grassland NPP. Among them， 41.12% of the total grassland area played a positive role （P<0.1） and 5.34% played a negative role （P<0.1）. In summary， from 1982 to 2015， the grasslands in Inner Mongolia were generally in a state of restoration， and the ecological environment was greatly improved under the combined effects of climate and human activities.

Key words: Inner Mongolia grassland, NPP, trend change, driving force analysis

CLC Number:

S812

Yongchun Hua, Rula Sa, Bing Wang. Spatial and temporal variation of grassland NPP and its driving forces in Inner Mongolia[J]. Journal of Desert Research, 2021, 41(5): 130-139.

Figures/Tables 10

References 34

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NPP变化类型	分区依据
NPP变化类型	R_NPPT-P	R_NPPP-T
气温驱动型	t≥0.1	F≥F₀
降水驱动型		t≥0.1， F≥F₀
降水、气温复合驱动型	t≤0.1	t≦0.1， F≤F₀
非气候因子驱动型		F≤F₀

NPP变化类型	分区依据
NPP变化类型	R_NPPT-P	R_NPPP-T
气温驱动型	t≥0.1	F≥F₀
降水驱动型		t≥0.1， F≥F₀
降水、气温复合驱动型	t≤0.1	t≦0.1， F≤F₀
非气候因子驱动型		F≤F₀

草原类型	降水驱动 /%	气温驱动 /%	降水、气温复合驱动/%	非气候驱动/%	合计 /%
草甸草原	59.18	1.83	19.14	19.84	100.00
典型草原	77.92	2.62	17.47	2.00	100.00
荒漠草原	68.60	0.71	30.27	0.42	100.00

草原类型	降水驱动 /%	气温驱动 /%	降水、气温复合驱动/%	非气候驱动/%	合计 /%
草甸草原	59.18	1.83	19.14	19.84	100.00
典型草原	77.92	2.62	17.47	2.00	100.00
荒漠草原	68.60	0.71	30.27	0.42	100.00

NPP变化趋势		年降水量与年均气温对草原NPP有复相关作用			年降水量与年均气温对草原NPP无复相关作用
NPP变化趋势		人类活动无明显干扰作用的面积	人类活动为负向干扰作用的面积	人类活动为正向干扰作用的面积	人类活动无明显干扰作用的面积	人类活动为负向干扰作用的面积	人类活动为正向干扰作用的面积
草甸草原	极显著减少	480.41	8 527.19	—	—	1 621.37	—
	极显著增加	780.66	—	9 488	60.05	—	1 741.47
	显著减少	1 981.67	5 584.71	—	—	2 281.92	—
	显著增加	1 080.91	—	4 924.15	—	—	1 561.32
	不显著变化	47 079.71	4 924.15	38 612.57	8 046.79	6 545.52	8 707.34
典型草原	极显著减少	780.66	9 908.36	—	—	60.05	—
	极显著增加	3 422.89	—	34 469.07	—	—	3 242.73
	显著减少	2 582.18	5 224.41	—	—	—	—
	显著增加	4 143.49		16 453.88	60.05	—	780.66
	不显著变化	90 015.92	3 903.29	94 579.77	120.1	—	1 140.96
荒漠草原	极显著减少	120.1	240.2	—	—	—	—
	极显著增加	1 621.37	—	4 864.1	—	—	240.2
	显著减少	1 561.32	240.2	—	—	—	—
	显著增加	2 522.13	—	4 924.15	—	—	60.05
	不显著变化	53 385.03	120.1	14 952.61	60.05	—	—
总计		211 558.43	38 672.62	223 268.31	8 347.04	10 508.86	17 474.74

Spatial and temporal variation of grassland NPP and its driving forces in Inner Mongolia

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