The Spatiotemporal Changes and Influencing Factors of Vegetation NDVI in the Hehuang Valley of Qinghai Province from 2000 to 2020

LI Xiaoyu; XIN Zhongbao; YANG Junliu; LIU Jinhao

doi:10.13870/j.cnki.stbcxb.2024.01.009

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The Spatiotemporal Changes and Influencing Factors of Vegetation NDVI in the Hehuang Valley of Qinghai Province from 2000 to 2020

更新时间：2025-03-12

- The Spatiotemporal Changes and Influencing Factors of Vegetation NDVI in the Hehuang Valley of Qinghai Province from 2000 to 2020
- Vol. 38, Issue 1, Pages: 79-90(2024)
- 作者机构：
  
  1. 北京林业大学水土保持学院,北京,100083
  2. 北京林业大学山西吉县森林生态系统国家野外科学观测研究站,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2024.01.009
  CLC： Q948.1
- Published：2024
- 稿件说明：
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LI Xiaoyu, XIN Zhongbao, YANG Junliu, et al. The Spatiotemporal Changes and Influencing Factors of Vegetation NDVI in the Hehuang Valley of Qinghai Province from 2000 to 2020[J]. 2024, 38(1): 79-90.
DOI：

LI Xiaoyu, XIN Zhongbao, YANG Junliu, et al. The Spatiotemporal Changes and Influencing Factors of Vegetation NDVI in the Hehuang Valley of Qinghai Province from 2000 to 2020[J]. 2024, 38(1): 79-90. DOI： 10.13870/j.cnki.stbcxb.2024.01.009.

摘要

[目的] 为了解青海河湟谷地植被时空变化情况

明晰气候变化、土地开发利用及人类活动等因素对植被变化的影响。[方法] 利用2000—2020年MODIS NDVI数据集表征植被变化

基于Theil-Sen Median趋势检验法、偏相关性分析、地理探测器等方法

探究青海河湟谷地NDVI时空变化情况及其与气温、降水、坡度、土壤类型和人类活动等影响因素的关系。[结果] (1)近20年河湟谷地植被NDVI呈波动增长趋势

显著增长区域面积为2.21×104 km2(p＜0.05)

占河湟谷地总面积的53.39%;植被NDVI显著下降区域面积为7.04×102 km2(p＜0.05)

主要分布在湟水谷地中部

占总面积的1.69%;(2)自然因素上

NDVI与气温、降水呈正相关区域分别占总面积的50.32%

80.14%。植被显著上升的区域主要分布在海拔2 800~3 100 m、坡度15°~20°、坡向为北向的区域。在高程小于3 200 m范围内

植被NDVI变化随高程增加呈现上升趋势

其中显著上升区域占总面积的54.37%。人类活动因素上

NDVI与人口密度、夜间灯光呈正相关区域分别占总面积的50.52%

38.53%。植被NDVI在森林、灌木、草地及建设用地上呈显著向好趋势。(3)综合偏相关性分析与地理探测器对植被NDVI变化归因分析可知

不同土壤类型上植被变化差异明显

年降雨量和人类活动是河湟谷地植被NDVI变化主要影响因素

各影响因素间存在交互作用

呈现相互增强和非线性增强关系。[结论] 研究结果揭示了河湟谷地植被NDVI时空变化特征

明确了自然因素与人为因素对植被NDVI变化的驱动机制

可为未来青海省河湟谷地生态保护、建设规划以及生态工程实施提供理论支撑。

Abstract

[Objective] This study is aimed to understand the spatiotemporal changes in vegetation in the Qinghai Hehuang Valley and clarify the effects of climate change

land development and utilization and human activities on vegetation change. [Methods] The MODIS NDVI dataset from 2000 to 2020 was used to characterize vegetation changes. Based on Theil-Sen Median trend test

partial correlation analysis

geographical detectors and other methods

this paper explored the spatiotemporal changes of NDVI in Qinghai Hehuang Valley and its relationship with temperature

precipitation

slope

soil type

human activities and other influencing factors. [Results] (1) In the past 20 years

the vegetation NDVI in the Hehuang Valley region had shown a fluctuating growth trend

with a significant increase in the area of 2.21×104 km2 (p＜0.05)

accounting for 53.39% of the total area of the Hehuang Valley. The area with a significant decrease in vegetation NDVI was 7.04×102 km2 (p＜0.05)

mainly distributed in the central part of the Huangshui Valley

accounting for 1.69% of the total area. (2) In terms of natural factors

the areas

in which NDVI was positively correlated with temperature and precipitation

accounting for 50.32% and 80.14% of the total area

respectively. The areas with significant vegetation increase were mainly distributed in areas with an altitude of 2 800~3 100 m

slope of 15°~20°

and a north facing slope. Within the range of elevation less than 3 200 m

vegetation NDVI changes showed an upward trend with the increasing of elevation

with a significant increase in the area accounting for 54.37% of the total area. In terms of human activity factors

the areas

in which NDVI was positively correlated with population density and nighttime lighting

accounting for 50.52% and 38.53% of the total area

respectively. Vegetation NDVI showed a significant upward trend in forests

shrubs

grasslands and construction land. (3) Based on the partial correlation analysis and the attribution analysis of vegetation NDVI changes by geographic detectors

it could be concluded that that there were obvious differences in vegetation changes among different soil types. Annual rainfall and human activities were the main influencing factors for vegetation NDVI changes in Hehuang Valley. The interaction between various influencing factors presented mutually reinforcing and non-linear enhancing relationships. [Conclusion] The spatiotemporal changes of vegetation NDVI in the Hehuang Valley were revealed

and the driving mechanisms of natural and human factors on vegetation NDVI changes were clarified

which could provide theoretical support for the future ecological protection

construction planning and the implementation of ecological engineering in Hehuang Valley of Qinghai Province.

关键词

Keywords

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