Feng Da,Duan Yafeng,Li Tingting.The vegetation spatiotemporal evolution and the response to geographical environment of Qian-Gui region in 20 years[J].Research of Soil and Water Conservation,2025,32(02):255-262.[doi:10.13869/j.cnki.rswc.2025.02.036]
黔桂地区20年间植被时空变化及其对地理环境的响应
- Title:
- The vegetation spatiotemporal evolution and the response to geographical environment of Qian-Gui region in 20 years
- 文章编号:
- 1005-3409(2025)02-0255-08
- 分类号:
- Q948.113; Q948.114
- 文献标志码:
- A
- 摘要:
- [目的]研究黔桂地区植被时空变化及其对地理环境的响应,为区域生态恢复工程效益评估和进一步恢复提供科学参考。[方法]基于NDVI数据,结合植被本底值和变化趋势,将区域植被分为9种状态类型; 利用均一化面积指数分析不同状态类型植被对岩性、地貌、土壤和地形位指数等地理特征的响应。[结果](1)2001—2020年NDVI年均值波动增加,平均趋势率为1.8×10-3/a,恢复趋势、退化趋势和稳定状态的植被面积分别占30.8%,9.1%和60.1%;(2)稳定型植被在低、中、高覆盖植被中面积占比逐渐降低,而退化型和恢复型的面积占比均依次增加;(3)纯碳酸盐岩上高覆盖植被均一化面积指数低于均值、低覆盖植被高于均值,而碎屑岩正好相反;(4)植被对红壤和水稻土的响应与本底覆盖度相关;(5)低覆盖稳定型植被在岩溶峡谷区集中分布,峰丛洼地的高覆盖植被优势明显;(6)低覆盖植被与地形位的响应关系明显,中覆盖植被受地形位影响较小。[结论]黔桂地区植被总体呈改善趋势,不同植被状态类型空间分布不均,赤红壤和岩溶峡谷上的植被相对稳定,黄壤区和峰林平原的高覆盖植被单向退化较为明显,高覆盖和低覆盖植被分别集中分布于地形位中值和低值区。
- Abstract:
- [Objective]The aims of this study are to examine the spatiotemporal changes of vegetation in the Qian-Gui region and its response to the geographical environment, and to provide the scientific reference for the benefit assessment of regional ecological restoration projects and further restoration efforts. [Methods]Based on NDVI data, combined with the baseline and trend of vegetation, regional vegetation was categorized into nine status types. The response of vegetation in different status types to geographical characteristics such as lithology, topography, soil, and topographic position index was analyzed by using the Normalized Difference Vegetation Index(NDVI). [Results](1)From 2001 to 2020, the annual mean NDVI exhibited a fluctuating increase, with an average trend rate of 1.8×10-3 per year. The vegetation areas in recovery, degradation, and stable states accounted for 30.8%, 9.1%, and 60.1%, respectively.(2)The proportion of stable vegetation types gradually decreased across low, medium, and high coverage vegetation, while the proportions of degraded and recovering types increased sequentially.(3)On pure carbonate rocks, the normalized area index for high coverage vegetation was below the mean, and for low coverage vegetation, it was above the mean, whereas clastic rocks showed the opposite pattern.(4)The response of vegetation to red soil and paddy soil was correlated with the background coverage degree.(5)Low coverage stable vegetation was concentrated in karst gorge areas, with high coverage vegetation showing a clear advantage in peak cluster depressions.(6)The response relationship between low coverage vegetation and topography was significant, while the influence of topography on medium coverage vegetation was less pronounced. [Conclusion]The vegetation in the Qian-Gui region generally shows an improving trend, with uneven spatial distribution across different vegetation states types. The vegetation on lateritic red soil and karst canyons is relatively stable, while the high coverage vegetation in the yellow soil areas and peak forest plains shows a more noticeable unidirectional degradation. High coverage and low coverage vegetation are concentrated in areas of medium and low topographic values, respectively.
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备注/Memo
收稿日期:2024-07-11 修回日期:2024-08-02 接受日期:2024-08-25
资助项目:国家重点研发计划项目(2016YFC0502401); 湖南省自然科学基金项目(2023JJ60558)
第一作者:冯达(1978—),男,湖南省岳阳市人,硕士,高级工程师,研究方向为耕地保护与自然资源利用。E-mail:fengda2000@126.com
通信作者:段亚锋(1979—),女,湖南省益阳市人,博士,高级工程师,研究方向为资源利用与环境保护。E-mail:206511@qq.com