基于年际Landsat系列数据的长汀县水土流失治理区植被恢复监测

Monitoring Vegetation Restoration in Soil and Water Loss Governance Area in Changting County Based onInterannual Landsat Time-series Dataset

恢复植被是水土流失治理最普遍的一种方式,植被不仅可以提高水土保持能力,同时也能作为水土流失治理成效好坏的标准。以福建省长汀县2000—2010年治理区为主要研究对象,通过构建2000—2015年以年为时间间隔的季相一致的中等分辨率Landsat时序数据集,利用归一化植被指数NDVI时序集对治理区域植被生长状态进行监测,并定量分析植被恢复情况与治理时间长度以及治理方式之间的关系。结果表明:①治理区域植被整体恢复趋势要明显优于未治理区域;②不同治理方式下植被恢复也有所差别,园改、经济林果和重复治理下植被恢复相对较快,封禁治理下植被恢复速度相对缓慢;③不同治理方式下植被增长幅度存在差异;④同种治理方式下,不同年份开始治理的区域植被恢复趋势也存在一定差异性。研究结果可为区域水土流失治理模式的选择提供参考,以期实现水土流失治理成效定量分析。

The restoration of vegetation is the most common approach to control soil and water loss.Vegetation not only improves the capacity of soil and water conservation,but also serves as a standard for soil erosion control.In this research we took the governance area of Changting County,Fujian Province from 2000 to 2010 as the research object.By constructing a medium-resolution time-series dataset from 2000 to 2015,we employed the NDVI time-series dataset to monitor the status of vegetation growth and quantified the relation between the restoration of vegetation and the time or pattern of governance.Results indicated that:(1)The overall tendency of vegetation restoration in the governance area is significantly better than that in untreated area.(2)the vegetation restoration under different governance patterns differs as well:the reform of forest-grass and economic fruit-forest as well as repetitive governance are faster to restore vegetation than closed-off reform.(3)The vegetation growth rate in different governance patterns varies also;whereas in the same governance model,the restoration tendency depends on governance age.The research findings are expected to offer reference for the selection of governance pattern and quantitative analysis.