Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; Huanjiang Observation and Research Station for Karst Eco-systems, Huanjiang 547100, China; University of Chinese Academy of Science, Beijing 100049, China.
Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; Huanjiang Observation and Research Station for Karst Eco-systems, Huanjiang 547100, China.
Sci Total Environ. 2021 May 20;770:145160. doi: 10.1016/j.scitotenv.2021.145160. Epub 2021 Jan 14.
The karst area in Yunnan-Guangxi-Guizhou region in southwest China is known for widespread rocky desertification but several studies report a greening trend since the year 2000. While the start of the greening trend seems to match with the implementation of ecological conservation projects, no statistical evidence on a relationship between vegetation greening and eco-engineering exists. Moreover, dominant factors influencing the spatial patterns of vegetation trends have rarely been investigated. Here we use six comprehensive factors representing the natural conditions and human activities of the study area, and several statistical models consistently show that eco-engineering explains large parts of the positive vegetation trends in the karst areas, while negative vegetation trends in non-karst areas of Yunnan were related with a decrease in rainfall. We further show that the interaction of eco-engineering with other factors leads to a heterogeneous pattern of different vegetation trends. Knowing and understanding these patterns is crucial when planning ecological restoration, especially in diverse landscapes like China karst and the methods can be reused in other restoration areas.
中国西南地区的滇桂黔喀斯特地区以广泛的石漠化为特征，但有几项研究报告称，自 2000 年以来出现了绿化趋势。虽然绿化趋势的开始似乎与生态保护项目的实施相吻合，但没有关于植被绿化与生态工程之间关系的统计证据。此外，很少有研究调查影响植被趋势空间格局的主导因素。在这里，我们使用了六个综合因素来代表研究区域的自然条件和人类活动，并且几个统计模型一致表明，生态工程解释了喀斯特地区植被积极趋势的大部分原因，而云南非喀斯特地区植被的消极趋势与降雨量减少有关。我们进一步表明，生态工程与其他因素的相互作用导致了不同植被趋势的异质格局。了解和理解这些模式对于规划生态恢复至关重要，特别是在像中国喀斯特这样的多样化景观中，这些方法可以在其他恢复地区重复使用。
