科尔沁和浑善达克沙地植被覆盖度时空变化及驱动力

doi:10.11707/j.1001-7488.LYKX20240686

摘要/Abstract

摘要：

目的: 探究2000年以来科尔沁和浑善达克沙地植被覆盖度时空变化特征及其驱动因子，为科学开展我国东部沙地生态治理和实现“三北”地区生态保护与高质量发展提供科学依据。方法: 基于2000—2022年MODIS-EVI数据计算植被覆盖度，采用趋势分析和地理探测器方法探究科尔沁、浑善达克沙地植被覆盖度时空变化特征及其驱动因子，利用Hurst指数分析两大沙地未来植被覆盖度变化情况。结果: 1） 2000—2022年科尔沁、浑善达克沙地植被覆盖度呈增加趋势，其多年植被覆盖度平均增速分别为0.0103 a^?1和0.0031 a^?1。2）科尔沁沙地植被覆盖度呈增加趋势的面积占比92.49%，广泛分布于科尔沁沙地全域；浑善达克沙地植被覆盖度呈增加趋势的面积占比70.70%，主要分布于浑善达克沙地的中部、东部、北部和南部。3）影响植被覆盖度时空变化的主要驱动因子在科尔沁沙地为土地利用类型和农田生产潜力，在浑善达克沙地为降水和气温；Hurst指数小于0.50的面积占科尔沁和浑善达克沙地的大部分区域。结论: 2000年以来科尔沁和浑善达克沙地荒漠化防治成效显著，植被生长状况趋于改善，但两大沙地植被覆盖度的驱动力存在差异，科尔沁、浑善达克沙地植被未来可能出现退化。

关键词: 植被覆盖度, 时空变化, 驱动力, 科尔沁沙地, 浑善达克沙地

Abstract:

Objective: This study aims to investigate the spatiotemporal variation characteristics and driving factors of vegetation coverage in the Horqin and Otindag sandy lands from 2000 to 2022, providing a scientific basis for the annihilation of the sandy lands of Horqin and Otindag. Method: Fraction of vegetation cover (FVC) was calculated using MODIS-EVI satellite data from 2000 to 2022. Trend analysis and geographical detectors were used to analyze the spatiotemporal characteristics and driving factors influencing FVC in the Horqin and Otindag sandy lands. The Hurst index was used to predict future FVC trends in the two sandy lands. Result: 1) FVC in the Horqin and Otindag sandy lands exhibited increasing trends from 2000 to 2022, with annual growth rate of 0.0103 a^?1 and 0.0031 a^?1, respectively. 2) The area with a positive trend in FVC accounted for 92.49% of the Horqin sandy land, covering almost the whole region. The area with increasing vegetation coverage in the Otindag sandy land accounted for 70.70%, mainly distributed in its central, eastern, northern and southern parts. 3) The dominant driving factors affecting the change of vegetation coverage were land use type and agricultural productivity potential in the Horqin sandy land, and precipitation and temperature in the Otindag sandy land. Areas with Hurst index less than 0.50 accounted for most areas of the Horqin and Otindag sandy lands. Conclusion: Since 2000, remarkable achievements have been made in combating desertification in the Horqin and Otindag sandy lands, leading to improved vegetation growth. However, the driving factors behind vegetation changes differ between the two regions, and the Hurst index analysis indicates a significant risk of vegetation degradation in the future in the two sandy lands.

Key words: fraction of vegetation cover (FVC), spatiotemporal variations, drivers, Horqin sandy land, Otindag sandy land

中图分类号:

S757

杨柳,闫峰,王艳姣. 科尔沁和浑善达克沙地植被覆盖度时空变化及驱动力[J]. 林业科学, 2025, 61(11): 70-79.

Liu Yang,Feng Yan,Yanjiao Wang. Spatiotemporal Variations Characteristics and Driving Forces of Vegetation Coverage in the Horqin and Otindag Sandy Lands[J]. Scientia Silvae Sinicae, 2025, 61(11): 70-79.

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判断依据 Criterion	交互作用 Interaction
q（x₁∩x₂）<Min[q（x₁），q（x₂）]	非线性减弱 Non-linear reduction
q（x₁∩x₂）= q（x₁）+ q（x₂）	独立Independent
Min[q（x₁），q（x₂）]<q（x₁∩x₂）<Max[q（x₁），q（x₂）]	单因子非线性减弱Single factor non-linear reduction
q（x₁∩x₂）>q（x₁）+ q（x₂）	非线性增强Non-linear enhancement
q（x₁∩x₂）>Max（q（x₁），q（x₂））	双因子增强Bi-factor enhancement

取值范围 Value range		未来趋势变化 Future trend changes
Theil-Sen	Hurst	未来趋势变化 Future trend changes
>0	>0.5	持续改善Continuous improvement
<0	>0.5	持续退化Continuous degradation
>0	<0.5	由改善到退化From improvement to degradation
<0	<0.5	由退化到改善From degradation to improvement

沙地Sandy land	面积占比Area proportion (%)
沙地Sandy land	极显著增加 Very significantly increased	显著增加 Significantly increased	不显著增加 No significantly increased	无变化 Unchange	不显著减少 No significantly reduced	显著减少 Significantly reduced	极显著减少 Very significantly reduced
科尔沁沙地 Horqin sandy land	54.56	13.54	24.39	0.63	5.89	0.51	0.48
浑善达克沙地 Otindag sandy land	11.89	8.43	50.38	10.77	17.37	0.71	0.44

沙地Sandy land	面积占比Area proportion (%)
沙地Sandy land	持续改善 Continuous improvement	由改善到退化 From improvement to degradation	持续退化 Continuous degradation	由退化到改善 From degradation to improvement
科尔沁沙地Horqin sandy land	22.96	70.34	1.88	4.82
浑善达克沙地Otindag sandy land	12.09	68.89	2.64	16.38

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