[NDVI Changes and Influencing Factors of Different Soil and Water Conservation Zones in Shandong Province].

Q2 Environmental Science
Wen-Ying Yi, Hai-Yang Wang, Ming-Ming Dong, Lu Tan, Huan-Chao Zhang, Lu-Yue Xu
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引用次数: 0

Abstract

Exploring the characteristics of vegetation change and its influencing factors is essential to construct an ecological environment. Based on the NDVI dataset from 2000 to 2020, this study analyzed the spatial temporal attributes of NDVI changes in Shandong Province using the Sen trend analysis and the gravity center migration model. Furthermore, the spatial heterogeneity of NDVI and its influencing factors within the whole study area and different soil and water conservation zones were investigated using a Geo-detector model, considering population, hydrological, topographic, soil types, and vegetation types. The results were as follows: ① The NDVI in Shandong Province from 2000 to 2020 showed a fluctuating upward trend with significant seasonal characteristics that varied from different zones. The annual NDVI change showed a trend of single-peak in the Ⅲ-4-2t, Ⅲ-4-1xt, and Ⅲ-5-2w but showed a trend of double-peak in the Ⅲ-5-3fn. ② Regarding the spatial distribution, the NDVI was higher in the west-north and west-south areas and lower in the north and coastal areas. During the 21 years, the primary type of NDVI change was "medium-high coverage → high coverage," especially in the northeastern part of the soil conservation area of the Ⅲ-4-2t, the western part of the Ⅲ-4-1xt, and the ecological maintenance area of the Ⅲ-5-2w. Overall, 61.47% of the area had a positive trend of NDVI change with the gravity center of high coverage mitigating to the northeast, and the ecological environment was improved. ③ Soil types and population density were the dominant factors affecting NDVI in Shandong Province, with q values of 0.174 and 0.130, respectively. The chief factor in the Ⅲ-5-3fn, Ⅲ-4-2t, and Ⅲ-4-1xt was population density, with q values higher than 0.22, and the dominant factors in the Ⅲ-5-2w were soil types and vegetation types, with q values of 0.326 and 0.227, respectively. The interaction of the two factors enhanced the influence of the single factor, and the relationship between the influencing factors showed two-factor enhancement and nonlinear enhancement. The q-value of population density ∩ relative humidity was the highest, with a value of 0.257 in the Ⅲ-5-3fn. The q-value of population density ∩ soil types was the highest in the Ⅲ-4-2t and Ⅲ-4-1xt, reaching 0.297 and 0.378, respectively. The q-value of soil types ∩ vegetation types was the highest, with a value of 0.444 in the Ⅲ-5-2w. The results are expected to provide valuable references for improving the ecological environment of Shandong Province and lay a scientific foundation to make different conservation strategies for the individual soil and water conservation zones.

[山东省不同水土保持区 NDVI 变化及其影响因素]。
探索植被变化特征及其影响因素对于构建生态环境至关重要。本研究基于 2000-2020 年 NDVI 数据集,利用森趋势分析和重心迁移模型分析了山东省 NDVI 变化的空间时间属性。此外,考虑到人口、水文、地形、土壤类型和植被类型等因素,利用 Geo-detector 模型研究了整个研究区和不同水土保持区内 NDVI 的空间异质性及其影响因素。结果如下: ① 2000-2020 年山东省 NDVI 呈波动上升趋势,季节性特征明显,不同区域差异显著。年 NDVI 变化在Ⅲ-4-2t、Ⅲ-4-1xt 和Ⅲ-5-2w 呈单峰变化趋势,而在Ⅲ-5-3fn 呈双峰变化趋势。21 年间,NDVI 变化的主要类型是 "中高覆盖→高覆盖",尤其是在Ⅲ-4-2t 水土保持区东北部、Ⅲ-4-1xt 西部和Ⅲ-5-2w 生态维护区。总体来看,61.47%的区域 NDVI 变化趋势为正,高覆盖重心向东北方向偏移,生态环境有所改善。土壤类型和人口密度是影响山东省 NDVI 的主导因子,q 值分别为 0.174 和 0.130。Ⅲ-5-3fn、Ⅲ-4-2t 和Ⅲ-4-1xt 的主要因子是人口密度,q 值均大于 0.22;Ⅲ-5-2w 的主导因子是土壤类型和植被类型,q 值分别为 0.326 和 0.227。两个因子的交互作用增强了单因子的影响,影响因子之间的关系呈现双因子增强和非线性增强。种群密度∩相对湿度的 q 值最高,在Ⅲ-5-3fn 中为 0.257。种群密度∩土壤类型的 q 值在Ⅲ-4-2t 和Ⅲ-4-1xt 中最高,分别为 0.297 和 0.378。土壤类型∩植被类型的 q 值最高,在 Ⅲ-5-2w 中为 0.444。研究结果为改善山东省生态环境提供了有价值的参考,为制定不同水土保持区的水土保持策略奠定了科学基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Huanjing Kexue/Environmental Science
Huanjing Kexue/Environmental Science Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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