Dynamic Change and Influencing Factors of Vegetation Cover over the Past 30 years in the Wutai Mountain Area

doi:10.13466/j.cnki.lyzygl.2022.04.012

Abstract

Abstract:

Based on 25 Landsat remote sensing data sources from 1991 to 2020,the temporal and spatial characteristics of vegetation coverage and its influencing factors in Wutai Mountain were analyzed by binary pixel model,wavelet analysis and partial correlation analysis.The results showed that the FVC values in Wutai Mountain area showed an increasing trend on the whole,in which the mean value of FVC in Wutai County was the highest,and the FVC growth rate in Yuanping City was the highest.There were three main change cycles of 9,12,21 years to control the change of FVC in the whole time domain.The vegetation cover in the study area showed a spatial distribution pattern of "low in the west and high in the east",and the improved area of vegetation cover was much larger than the degraded area.The CV values of Wutai County showed a large negative deviation phenomenon when the altitude was lower than 2 400m,and a large positive deviation phenomenon when the altitude was higher than 2 400m.The FVC values of Fanshi County showed an order as follows:shade slope>sunny slope>half shade slope>half sunny slope;The peak values of FVC in each slope direction of Dai County and Yuanping City appeared in the altitude range of 1 600~2 000m.The negative deviation of CV values in Wutai County,Dai County and Yuanping City increased with the increase of slope.From 1980 to 2015,the mean value of partial correlation coefficient between FVC value and temperature was 0.14,and that between FVC value and precipitation was 0.05.In Wutai Mountain area,the area of forest land and construction land increased,while the area of cultivated land and grassland decreased to varying degrees from 1980 to 2015,and there were vegetation decline problems in human-active areas such as mining areas and scenic spots.

Key words: Wutai Mountain area, vegetation coverage, influencing factors, remote sensing, Pixel binary model

CLC Number:

Q948

REN Tianchen, CHEN Junfeng, LIU Nan. Dynamic Change and Influencing Factors of Vegetation Cover over the Past 30 years in the Wutai Mountain Area[J]. FOREST RESOURCES WANAGEMENT, 2022, (4): 89-99.

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覆盖度等级	耕地比例/ %	林地比例/ %	草地比例/ %	水域比例/ %	建设用地比例/%	总比例/ %	海拔/m	坡度/(°)	气温/(℃)	降水/mm
Ⅴ	40.5	4.8	19.0	47.2	57.8	18.9	1137.4	15.0	7.3	515.0
Ⅳ	26.6	8.7	17.8	19.5	18.9	16.2	1235.7	17.8	6.9	527.7
Ⅲ	20.4	16.8	21.3	16.5	12.2	19.5	1409.1	20.9	6.0	552.2
Ⅱ	9.4	26.4	21.9	10.2	7.2	21.2	1642.2	23.6	5.4	572.5
Ⅰ	3.1	43.3	19.9	6.6	3.8	24.3	1758.7	25.7	4.7	593.0

区域	坡向	海拔/m
区域	坡向	≤1200	1200~ 1600	1600~ 2000	2000~ 2400	>2400
五台县	阴坡	0.466	0.731	0.859	0.863	0.601
	半阴坡	0.405	0.619	0.778	0.771	0.622
	半阳坡	0.353	0.537	0.709	0.728	0.627
	阳坡	0.412	0.659	0.806	0.815	0.639
繁峙县	阴坡	0.394	0.457	0.764	0.845	0.685
	半阴坡	0.371	0.422	0.624	0.739	0.664
	半阳坡	0.335	0.379	0.524	0.617	0.634
	阳坡	0.372	0.438	0.683	0.781	0.667
代县	阴坡	0.360	0.615	0.724	0.711	0.667
	半阴坡	0.382	0.525	0.628	0.599	0.597
	半阳坡	0.371	0.443	0.552	0.531	0.529
	阳坡	0.337	0.543	0.679	0.664	0.571
原平市	阴坡	0.329	0.596	0.766	-	-
	半阴坡	0.284	0.502	0.603
	半阳坡	0.255	0.378	0.535
	阳坡	0.296	0.490	0.648

区域	海拔/m
区域	≤1200	1200~ 1600	1600~ 2000	2000~ 2400	>2400
五台县	-13.2	-11.3	-6.7	-6.0	6.1
繁峙县	-1.5	-1.1	-3.1	-2.1	-0.7
代县	-1.6	-3.4	-1.7	-1.9	-4.1
原平市	-2.8	-5.4	-4.6	—	—

区域	坡向	坡度/(°)
区域	坡向	≤5	5~15	15~25	25~35	>35
五台县	阴坡	0.441	0.570	0.740	0.819	0.823
	半阴坡	0.431	0.512	0.641	0.705	0.709
	半阳坡	0.417	0.465	0.560	0.602	0.607
	阳坡	0.429	0.534	0.679	0.732	0.712
繁峙县	阴坡	0.281	0.412	0.659	0.766	0.829
	半阴坡	0.282	0.413	0.558	0.616	0.650
	半阳坡	0.287	0.416	0.505	0.520	0.514
	阳坡	0.285	0.414	0.600	0.676	0.706
代县	阴坡	0.405	0.488	0.661	0.713	0.722
	半阴坡	0.415	0.484	0.584	0.613	0.615
	半阳坡	0.412	0.444	0.502	0.516	0.517
	阳坡	0.398	0.459	0.597	0.640	0.642
原平县	阴坡	0.336	0.372	0.502	0.652	0.706
	半阴坡	0.331	0.316	0.376	0.511	0.562
	半阳坡	0.314	0.289	0.331	0.390	0.433
	阳坡	0.316	0.337	0.438	0.541	0.570

区域	坡度/(°)
区域	≤5	5~15	15~25	25~35	>35
五台县	-2.8	-6.9	-9.3	-12.2	-15.6
繁峙县	0.4	0.1	-2.5	-3.5	-4.6
代县	-0.4	-1.5	-2.7	-2.9	-3.2
原平市	-1.5	-2.7	-3.9	-5.3	-6.0