云南省建水县石漠化修复模式评价

基于1992—2017年LandsatTM数据、建水县森林资源二类调查数据及云南省石漠化监测数据,借助Mann-Kendall突变分析和趋势分析等方法,探讨近25年云南省建水县植被的时空变化特征及不同石漠化修复模式下的植被恢复情况。结果表明:1)25年间,建水县植被覆盖整体上呈上升趋势,平均增速为0.065%/10a,以2008年为界,增速由之前的0.077%/10a增加到0.475%/10a;2)25年间,建水县植被覆盖呈增加趋势的区域、无显著变化区域及呈减少趋势的区域面积占比分别为55.32%,34.44%和10.24%;3)对于不同修复模式,在10年的修复时间范围内,纯生态林模式与混交生态林模式下植被恢复效果差别不大,而在25年的修复时间范围内,混交生态林模式下植被修复速率明显优于纯生态林修复模式,优势主要展现在修复后期。短期内,纯生态林模式中阔叶树和桤木的植被修复效果较好;从长期看,云南松和车桑子是较好的修复树种。混交生态林模式中,针叶混交林修复速率在10年和25年修复时间范围内均表现最优,是较好的混交模式。研究结果揭示了不同治理模式对植被恢复的效果,可为优化石漠化区域生态修复...

Evaluation of Rock Desertification Restoration Modelin Jianshui County,Yunnan Province

Based on Landsat TM data from 1992 to 2017, the second-class survey data of Jianshui County forest resources and the monitoring data of rocky desertification in Yunnan Province, with Mann-Kendall mutation analysis and trend analysis, the temporal and spatial variation characteristics of vegetation and the restoration of vegetation in different rocky desertification restoration models in Jianshui County of Yunnan Province in the past 25 years were discussed. The study found that during the 25 years, the vegetation cover of Jianshui County showed an overall upward trend with an average growth rate of 0.065%/10a. Since 2008, the growth rate increased from 0.077%/10a to 0.475%/10a. The area of vegetation cover in Jianshui County showed an increasing trend, no significant change, and the proportion of reduction trend was 55.32%, 34.44% and 10.24% respectively. For different restoration models, within the restoration time range of ten years, there was not much difference in the effect of vegetation restoration under the pure ecological forest mode and the mixed ecological forest mode. Within the restoration time range of 25 years, the mixed ecological forest mode vegetation restoration rate was obviously better than pure ecological forest restoration mode, and the advantages were mainly displayed in the later stage of restoration. In terms of species selection of pure ecological forest model, broad-leaved forests and alders had better restoration effects in the short term; in the long run, Yunnan pine and Che sang-tzu were better restoration species. In the mixed ecological forest model, the coniferous mixed forest restoration rate was the best both in the range of ten and twenty-five years, indicating mixed ecological forest model is a better mixed model. The study revealed the effects of different governance models on vegetation restoration, and provided a theoretical basis for optimizingecological restoration methods in rocky desertification areas.