North American forest disturbance mapped from a decadal Landsat record
North American forest disturbance mapped from a decadal Landsat record
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DOI：
10.1016/j.rse.2008.02.010
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发表时间：
2008-06-16
影响因子：
13.5
通讯作者：
Nelson, Peder
中科院分区：
文献类型：
--
作者：
Masek, Jeffrey G.;Huang, Chengquan;Nelson, Peder
森林扰动和恢复是关键的生态系统过程，但扰动的空间模式从未在整个北美绘制出来。 LEDAPS（Landsat 生态系统干扰自适应处理系统）项目利用 Landsat 卫星档案收集了 1990 年至 2000 年期间美国和加拿大的林地清理干扰（砍伐收获、火灾）的完整记录。 Landsat TM 和 ETM+ 数据首先使用 MODIS/6S 大气校正方法转换为表面反射率。使用从早期（类似于 1990 年）和后期（类似于 2000 年）图像计算出的缨帽“干扰指数”中的时间变化来绘制干扰和早期恢复图。使用来自美国 23 个地点的两年一次的 Landsat 时间序列样本对大陆测绘进行了验证。尽管由于图像采集日期之间的间隔较长而无法绘制大量干扰（30-60%），但两年一次的分析允许对年代际映射进行一阶校正。我们的结果表明，在美国和加拿大，每年发生高达 2-3% 的干扰率很常见，这主要是由于采伐和森林火灾造成的。美国东南部、太平洋西北地区、缅因州和魁北克省的发病率最高。美国本土（“下 48 个”州和哥伦比亚特区）的平均扰乱率计算为每年 0.9 +/-0.2%，相当于 110 年的周转期。 (C) 2008 Elsevier Inc. 保留所有权利。
Forest disturbance and recovery are critical ecosystem processes, but the spatial pattern of disturbance has never been mapped across North America. The LEDAPS (Landsat Ecosystem Disturbance Adaptive Processing System) project has assembled a wall-to-wall record of stand-clearing disturbance (clearcut harvest, fire) for the United States and Canada for the period 1990-2000 using the Landsat satellite archive. Landsat TM and ETM+ data were first converted to surface reflectance using the MODIS/6S atmospheric correction approach. Disturbance and early recovery were mapped using the temporal change in a Tasseled-Cap "Disturbance Index" calculated from the early (similar to 1990) and later (similar to 2000) images. Validation of the continental mapping has been carried out using a sample of biennial Landsat time series from 23 locations across the United States. Although a significant amount of disturbance (30-60%) cannot be mapped due to the long interval between image acquisition dates, the biennial analyses allow a first-order correction of the decadal mapping. Our results indicate disturbance rates of up to 2-3% per year are common across the US and Canada due primarily to harvest and forest fire. Rates are highest in the southeastern US, the Pacific Northwest, Maine, and Quebec. The mean disturbance rate for the conterminous United States (the "lower 48" states and District of Columbia) is calculated as 0.9 +/-0.2% per year, corresponding to a turnover period of 110 years. (C) 2008 Elsevier Inc. All rights reserved.