Li Xia,Wang Xiaokang,Liu Xiuhua,et al.Spatiotemporal Variation of Vegetation NDVI and Climate Factor Detection in Shaanxi Province from 2000-2020[J].Research of Soil and Water Conservation,2024,31(02):443-453.
2000-2020年陕西省植被NDVI时空变化及气候因子探测
- Title:
- Spatiotemporal Variation of Vegetation NDVI and Climate Factor Detection in Shaanxi Province from 2000-2020
- 文章编号:
- 1005-3409(2024)02-0443-11
- 分类号:
- Q948
- 文献标志码:
- A
- 摘要:
- [目的]揭示陕西省不同生态系统植被时空变化,厘清不同气候因子及相互作用对植被变化的影响机制,为区域生态环境保护提供理论依据。[方法]基于MODIS NDVI及年均高温、年均低温、年均温、年总降水数据,采用Theil-Sen Median趋势、偏相关、地理探测器等方法,分析了2000—2020年各地貌分区植被NDVI时空变化特征,结合变量分离探究了植被NDVI变化与降水、气温的内部关联和响应机制。[结果] 2000—2020年陕西植被NDVI波动增加,速率为5.9%/10 a,速率大小为陕北>关中>陕南; 全省多年植被NDVI值为0.71,南高北低; 植被NDVI显著改善区域占比67%,分区占比为陕北>陕南>关中。2000—2020年陕西气候因子随时间波动变化,速率大小为陕南>关中>陕北,空间上呈现年均高温降低、年均低温上升、年均温降低、降水增加。2000—2020年陕西及各分区植被NDVI与年均高温整体呈负相关,与年均低温、年均温、年总降水量呈正相关; 全省及陕北年总降水贡献最大,关中和陕南年均高温贡献最大; 年均高温与年总降水交互主导全省、陕北及陕南植被NDVI变化,年均温与年总降水的交互主导关中植被NDVI变化。[结论]研究期陕西及各分区植被整体变好,各分区植被对气候的响应关系、各因子的贡献及其相互作用不同,降水和年均高温、年均温的交互显著影响植被NDVI变化。
- Abstract:
- [Objective] This paper reveals the spatiotemporal changes of vegetation in different ecosystems in Shaanxi Province, clarifies the influence mechanisms of different climatic factors and their interactions on the changes of vegetation, and provides a theoretical basis for regional ecological environmental protection. [Methods] Based on MODIS NDVI and annual average high temperature, annual average low temperature, annual average temperature, and annual total precipitation data, this paper analyzed the spatiotemporal variation characteristics of vegetation NDVI in each landscape partition from 2000 to 2020 by Theil-Sen Median trend, partial correlation, and geodetector, and the internal correlations and response mechanisms of vegetation NDVI changes with precipitation and temperature were investigated by combining variable separation. [Results] Vegetation NDVI in Shaanxi fluctuated and increased from 2000 to 2020 at a rate of 5.9%/per decade, among which the rate of vegetation NDVI decreased in the different landscape in the order: Northern Shaanxi>Guanzhong>Southern Shaanxi.The multi-year vegetation NDVI value of the province was 0.71, with high level in the south and low level in the north. Vegetation NDVI in 67% of the regions showed a significantly improved trend during the study period, and the proportion in different landscape decreased in the order: Northern Shaanxi>Southern Shaanxi>Guanzhong. The climate factors fluctuated over time in Shaanxi from 2000 to 2020, the change rates in different landscape decreased in the order: Shaanxi South>Guanzhong >Shaanbei. The spatial trends of temperature factors showed the decrease in annual average high temperature, the increase in annual average low temperature, and the decrease in annual average temperature, and the increase in precipitation.The overall vegetation NDVI of Shaanxi and each subdistrict from 2000 to 2020 was negatively correlated with annual average high temperature and positively correlated with annual average low temperature, annual average temperature, and annual total precipitation. The contribution of annual total precipitation was greatest in the province and northern Shaanxi, and the contribution of annual average high temperature was greatest in Guanzhong and southern Shaanxi. The interaction of annual average high temperature and total annual precipitation had the strongest influence on vegetation NDVI in the province, northern Shaanxi and southern Shaanxi, and the interaction between annual mean temperature and total annual precipitation had the strongest effect on vegetation NDVI in Guanzhong. The interaction of of precipitation with maximum and annual average temperatures significantly influenced the vegetation NDVI changes. [Conclusion] The vegetation in Shaanxi and the sub-regions had became better overall during the study period. The vegetation in each sub-region responded differently to climate, and the contribution of each factor and its interactions also differed.
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备注/Memo
收稿日期:2023-04-27 修回日期:2023-05-29
资助项目:国家高端外国专家引进项目“生态平衡评估指标体系研究”(G2021171029L)
第一作者:李霞(1977—),女,陕西西安人,博士,副教授,主要从事地理信息学、生态遥感及生态修复研究。E-mail:lixia666@chd.edu.cn
通信作者:王孝康(1973—),男,陕西合阳人,高级工程师,主要从事国土绿化与生态价值评价技术与研究。E-mail:867920018@qq.com