新疆及周边中亚地区土地覆盖变化对地表反照率的影响

doi:10.13866/j.azr.2024.10.04

Abstract

Abstract:

Based on MODIS MCD12C1 land cover and MCD43C3 surface albedo data, we investigated the spatial and temporal distribution characteristics of land cover and surface albedo in Xinjiang and its surrounding Central Asian region from 2002 to 2021. We also discuss the impact of land cover change on surface albedo. Results demonstrated that (1) The net change of land cover was primarily characterized by the decrease of barren land and cropland and the increase of woodland and grassland, and the largest change was in grassland. The change of barren land around the Tarim Basin into grassland was obvious, and the problem of shrub encroachment in the arid area of Central Asia was serious. (2) The conversion of barren land into grassland and grassland into woodland resulted in a decrease of surface albedo by 0.006 and an increase of surface albedo by 0.009, respectively. The conversion of shrub encroachment resulted in an increase of surface albedo by 0.012. The conversion of grassland into barren and exerted the largest impact on surface albedo, with a change of 0.015. The mutual transformation of cropland and grassland exerted the least impact on surface albedo, with a change of <0.001. (3) The change in surface albedo was the most obvious from 2006 to 2011, with the proportion of significant change being 34.87%. (4) The change in surface albedo in the arid area was significantly higher than that in other regions, and the surface albedo in woodland was higher than that in grassland and cropland, due to which the change trend in the three land types was different from that in other regions.

Key words: MODIS data, land cover, surface albedo, spatio-temporal difference, Xinjiang, Central Asian region

XU Yunhong, LIU Qiong, CHEN Yonghang, WEI Xin, LIU Xin, ZHANG Taixi, SHAO Weiling, YANG Hequn, ZHANG Chengming. Impact of land cover variations on surface albedo in Xinjiang and its surrounding Central Asian region[J].Arid Zone Research, 2024, 41(10): 1649-1661.

Figures/Tables 13

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重分类体系	原分类体系	类型代码
水体	水体	0
林地	常绿针叶林	1
	常绿阔叶林	2
	落叶针叶林	3
	落叶阔叶林	4
	混交林	5
	封闭的灌木丛	6
	开阔的灌木丛	7
草地	稀树草原	8
	草原	9
	草地	10
永久湿地	永久湿地	11
耕地	耕地	12
耕地	耕地或自然植被镶嵌	14
城市和建筑用地	城市和建筑用地	13
永久冰雪	永久冰雪	15
裸地	裸地	16

代码	意义
0	最佳质量，100%完全反演
1	质量好，75%及以上为最佳完全反演和90%及以上为完全反演
2	质量相对较好，75%及以上为完全反演
3	混合，75%及以下的完全反演和25%及以下的填充值
4	50%及以下的填充值
5	50%及以上的填充值

转变类型	2002—2006年	2006—2011年	2011—2016年	2016—2021年	2002—2021年
转变类型	面积/km²	面积/km²	面积/km²	面积/km²	面积/km²	转出比例/%
裸地→草地	19409.0	33635.8	44325.6	40441.0	137811.3	64.77
裸地→林地	3545.9	18434.1	26602.8	15950.4	64533.3	30.33
裸地→耕地	1684.9	3681.7	2488.6	2578.8	10434.0	4.90
草地→耕地	105296.7	56729.5	73393.9	38042.5	273462.6	47.65
草地→裸地	14820.4	36934.0	28460.0	33657.6	113872.0	19.84
草地→林地	6246.9	51907.2	58004.1	70391.4	186549.6	32.51
耕地→草地	48400.0	95133.0	68746.7	115062.2	327341.8	85.41
耕地→林地	9362.2	11328.8	9592.9	21156.7	51440.5	13.42
耕地→裸地	309.6	609.8	1585.9	1982.2	4487.5	1.17
林地→草地	14797.8	34917.6	35339.7	27313.3	112368.5	52.33
林地→耕地	8152.9	28641.7	11421.1	7158.9	55374.5	25.79
林地→裸地	425.6	17062.2	17842.2	11665.4	46995.4	21.88

Impact of land cover variations on surface albedo in Xinjiang and its surrounding Central Asian region

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