Laboratory for Earth Surface Processes, Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China.
Laboratory for Earth Surface Processes, Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China.
J Environ Manage. 2022 Aug 15;316:115160. doi: 10.1016/j.jenvman.2022.115160. Epub 2022 May 16.
Clarifying the complex land use impacts on ecosystem services (ESs) trade-off will be beneficial to watershed sustainable development, especially through scientific land use management and decision making. Dongting Lake Basin (DLB) is not only one of the most significant ecological barriers for the Yangtze River Economic Belt, but also an important grain production base of China. The trade-off between the grain production (GP) and water purification (WP) has become increasingly prominent. Here, we chose DLB as a case study area, applied spatial continuous wavelet transform and wavelet coherence analysis, characterized the ES trade-off intensity by wavelet coherence coefficient, and explored the influence of land use type, conflict and intensity on the trade-off between GP and WP. The results showed that the trade-off intensity between GP and WP in the DLB in 2015 had alleviated compared with 2005, and the coherence coefficient had increased while maitaining the negative value. The trade-off intensity was the strongest in farmland and forest land, and weaker in grassland and water body. The impact of land use conflict mainly depended on the specific types of land use conversions. For the transects where land use conversions mainly appeared between farmland and forest land, the intensification of land use conflict would increase the trade-off intensity (2005: R = 0.3862, p < 0.05; 2015: R = 0.2543, p < 0.05), while for the transects dominated by conversions to water body and grassland, stronger land use conflicts would reduce the trade-off intensity (2005: R = 0.3438, p < 0.05; 2015: R = 0.2668, p < 0.05). The impact of land use intensity was also realized through the land use type, with lower interpretation ratio. In addition, the wavelet coherence analysis showed that the scale about 10.51 km was the most suitable for exploring the trade-off between GP and WP, which was equivalent to the scale of the secondary watershed in the study area.
阐明复杂的土地利用对生态系统服务（ESs）权衡的影响将有利于流域的可持续发展，特别是通过科学的土地利用管理和决策。洞庭湖流域（DLB）不仅是长江经济带最重要的生态屏障之一，也是中国重要的粮食生产基地。粮食生产（GP）与水净化（WP）之间的权衡关系日益突出。在这里，我们选择 DLB 作为案例研究区，应用空间连续小波变换和小波相干分析，通过小波相干系数来刻画 ES 权衡强度，并探讨土地利用类型、冲突和强度对 GP 和 WP 之间权衡的影响。结果表明，与 2005 年相比，2015 年 DLB 区 GP 和 WP 之间的权衡强度有所缓解，相干系数增加但仍保持负值。权衡强度在耕地和林地最强，在草地和水体较弱。土地利用冲突的影响主要取决于具体的土地利用转换类型。对于主要发生在耕地和林地之间的土地利用转换的剖面，土地利用冲突的加剧会增加权衡强度（2005 年：R=0.3862，p<0.05；2015 年：R=0.2543，p<0.05），而对于主要以转换为水体和草地为主的剖面，更强的土地利用冲突会降低权衡强度（2005 年：R=0.3438，p<0.05；2015 年：R=0.2668，p<0.05）。土地利用强度的影响也是通过土地利用类型来实现的，其解释率较低。此外，小波相干分析表明，10.51km 左右的尺度最适合探讨 GP 和 WP 之间的权衡关系，这相当于研究区次流域的尺度。
