Spatiotemporal variation patterns of land desertification from 2000 to 2020 in the Horqin-Otindag Sandy Land

doi:10.7522/j.issn.1000-694X.2024.00040

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (4): 46-56.DOI: 10.7522/j.issn.1000-694X.2024.00040

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Spatiotemporal variation patterns of land desertification from 2000 to 2020 in the Horqin-Otindag Sandy Land

Eryan Liu¹^,²(), Yuanyuan Zhao¹^,²^,³(), Die Zhou¹^,², Haiyan Wu¹^,², Guanglei Gao¹^,²^,³, Guodong Ding¹^,²^,³

^1.School of Soil and Water Conservation /, Beijing Forestry University，Beijing 100083，China
^2.Key Laboratory of National Forestry and Grassland Administration on Soil and Water Conservation /, Beijing Forestry University，Beijing 100083，China
^3.Yanchi Ecology Research Station of the Mu Us Desert, Beijing Forestry University，Beijing 100083，China

Received:2023-12-08 Revised:2024-03-10 Online:2024-07-20 Published:2024-08-29
Contact: Yuanyuan Zhao

Abstract

Abstract:

The Horqin-Otindag Sandy Land is one of the areas with the most severe land desertification in China. Understanding spatiotemporal patterns of land desertification is an important foundation for scientific desertification control. The study took the Horqin-Otindag Sandy Land as the study area. Based on the MOD13Q1 NDVI data， meteorological data， socio-economic data， the spatiotemporal patterns of land desertification and their driving factors were revealed from 2000 to 2020 using Sen+Mann Kendall trend analysis， strip analysis， geographical detectors and other methods. The results showed that：（1） The land desertification intensity was much more serious in the west than that in the east. Slight desertification appeared in the junction of the Horqin Sandy Land and the Otindag Sandy Land. （2） From 2000 to 2020， land desertification in the study area showed a significant reversal trend in general. The desertification reversed area accounted for 73.59% of the total study area， which mainly distributed in the middle east of Otindag Sandy Land and the southeast of Horqin Sandy Land. The desertification area with deterioration trend accounted for 11.17%， which was scattered in the study area. （3） The annual precipitation and population density are the dominant factors affecting the spatial pattern of land desertification during the study period. The interaction of all factors shows bivariate enhancement， among which the precipitation and soil type interaction most obvious. We suggested to strengthen cross regional cooperation and coordination under the premise of scientific assessment of regional resource and environment carrying capacity， strengthen the governance of Otindag Sandy Land， optimize the industrial structure of Horqin Sandy Land， promote the coordinated development of ecology and economy， and promote the integrated protection and systematic governance of mountains， rivers， forests， fields， lakes， grass and sand. This study could provide a theoretical basis for the ecological restoration and sustainable utilization of desertified land in the study area.

Key words: land desertification, sandy lands, trend analysis, geographic detector model

CLC Number:

P931.3

Eryan Liu, Yuanyuan Zhao, Die Zhou, Haiyan Wu, Guanglei Gao, Guodong Ding. Spatiotemporal variation patterns of land desertification from 2000 to 2020 in the Horqin-Otindag Sandy Land[J]. Journal of Desert Research, 2024, 44(4): 46-56.

Figures/Tables 11

Table 1 Classification of desertified land based on vegetation coverage

沙化等级	植被覆盖度FVC/%	地表景观
未沙化	>60	草地、林地等，植被覆盖浓密
轻度沙化	30~60	固定沙地，表面有薄层黏土结皮、盐结皮，在风力作用下不发生位移
中度沙化	10~30	半固定沙地，流沙呈斑点状分布，有风沙活动现象但不严重
重度沙化	<10	流动沙地，沙地表面植被稀疏，风沙流活动极其显著

Table 2 Classification of land desertification trend

趋势等级	$β$ 值	$Z$ 值
沙化明显逆转	$≥$ 0.0005	>1.96
沙化轻微逆转	$≥$ 0.0005	$≤$ 1.96
基本稳定	-0.0005 $< β <$ 0.0005	—
沙化轻微加剧	$≤$ -0.0005	$≤$ 1.96
沙化明显加剧	$≤$ -0.0005	$>$ 1.96

Table 2 Classification of land desertification trend

趋势等级	$β$ 值	$Z$ 值
沙化明显逆转	$≥$ 0.0005	>1.96
沙化轻微逆转	$≥$ 0.0005	$≤$ 1.96
基本稳定	-0.0005 $< β <$ 0.0005	—
沙化轻微加剧	$≤$ -0.0005	$≤$ 1.96
沙化明显加剧	$≤$ -0.0005	$>$ 1.96

Fig.1 The location of the study area

Fig.2 Spatial distribution of land desertification in the study area

Table 3 Area and proportion of land desertification grade in the study area

沙化等级	2000年		2020年
沙化等级	面积/万km²	比例/%	面积/万km²	比例/%
重度沙化	5.33	18.98	1.78	6.33
中度沙化	8.05	28.64	6.01	21.38
轻度沙化	9.06	32.24	8.25	29.37
未沙化	5.66	20.14	12.05	42.92

Fig.3 The proportion of desertification grade area in typical sandy stripe

Fig.4 Severe， moderate， and mild desertification areas in typical sandy stripe

Fig.5 The change trend of vegetation coverage of the study area from 2000 to 2020

Fig.6 The trend of land desertification in the study area from 2000 to 2020

Fig.7 Interannual variation of vegetation coverage in different units of typical sandy strip

Fig.8 The explanatory power of different driving factors on land desertification in the research area from 2000 to 2020

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Spatiotemporal variation patterns of land desertification from 2000 to 2020 in the Horqin-Otindag Sandy Land

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