1987年大兴安岭森林大火对植被影响数据集

1987年5月6日至6月2日在黑龙江省大兴安岭地区发生了森林大火。基于森林大火前后（1986年6月5日、1986年6月12日、1987年6月15日、1987年7月26日）的Landsat TM数据的近红外波段和中红外波段的反射率，计算归一化差分燃烧比（dNBR），参考过火后的遥感影像，设定dNBR阈值，得到大兴安岭过火范围及燃烧指数（火情指数）数据；然后基于时间序列的8天合成的GLASS的叶面积指数（LAI，1981-2016年）和光合有效辐射吸收比例（FAPAR，1982-2016年）产品，通过最大值合成得到每月的数据和每年的数据，在此基础上计算距平，得到1987、1992、1997、2002年LAI、FAPAR的距平空间数据；同时，参考大火前后遥感影像，在高火烧强度区、低火烧强度区及未过火林地区分别划出样区，统计样区内植被在1981-2016年每8天的LAI、FAPAR数据和1982-2015年每年的LAI、FAPAR数据；根据过火范围，裁剪MCD12Q1数据，然后将土地利用类型合并为7类：森林、灌木、草地、永久湿地、耕地、建筑用地、耕地与自然植被，对每一类土地覆盖所占的面积比例进行统计，得到1987年大兴安岭森林大火及其对植被影响数据集。该数据集包括：（1）1987年大兴安岭森林火灾范围数据；（2）1987年大兴安岭森林燃烧指数（dNBR）数据（空间分辨率为30 m）；（3）1987、1992、1997、2002年LAI、FAPAR的年距平空间数据集（空间分辨率为0.05&deg，约5 km）；（4）高、低火烧强度区及未过火林地区的样区空间位置数据和这些区域1981-2016年每8天的LAI、FAPAR统计数据、1982-2015年每年的LAI、FAPAR统计数据；（5）2000、2004、2008、2012年过火范围内的土地覆盖空间分布数据（空间分辨率为500 m）及2000-2013年各类土地覆盖所占的面积比例统计数据。数据集存储为.shp、.tif和.xlsx格式，包含58个数据文件，数据量为206 MB（压缩为1个数据文件，60.7 MB）。

The 1987 Greater Khingan Range forest fire broke out in Heilongjiang Province from May 6 to June 2, 1987. Based on the reflectance of near-infrared and mid-infrared bands of Landsat TM data collected before and after the forest fire (June 5, 1986; June 12, 1986; June 15, 1987; July 26, 1987), the normalized difference burn ratio (dNBR) was calculated. By referring to post-fire remote sensing images and setting the dNBR threshold, the burned area and burn severity (fire index) data of the Greater Khingan Range were obtained.

Then, using the 8-day composite GLASS leaf area index (LAI, 1981-2016) and fraction of absorbed photosynthetically active radiation (FAPAR, 1982-2016) products, monthly and annual datasets were generated via maximum value composite (MVC). On this basis, anomaly values were calculated to produce the spatial anomaly datasets of LAI and FAPAR in 1987, 1992, 1997 and 2002.

Meanwhile, referring to remote sensing images before and after the fire, sample plots were delineated in high burn severity areas, low burn severity areas and unburned forest areas. Statistical analyses were conducted on the LAI and FAPAR data of vegetation every 8 days from 1981 to 2016 and annual LAI and FAPAR data from 1982 to 2015 within these sample plots.

Additionally, the MCD12Q1 dataset was clipped based on the burned area. The land use types were then merged into 7 categories: forest, shrub, grassland, permanent wetland, cropland, built-up land, and cropland and natural vegetation. The area proportion of each land cover type was counted to establish this dataset on the 1987 Greater Khingan Range forest fire and its impacts on vegetation.

This dataset includes:
(1) Burned area data of the 1987 Greater Khingan Range forest fire;
(2) 1987 Greater Khingan Range forest burn severity (dNBR) data with a spatial resolution of 30 m;
(3) Annual anomaly spatial datasets of LAI and FAPAR in 1987, 1992, 1997 and 2002, with a spatial resolution of 0.05° (approximately 5 km);
(4) Spatial location data of sample plots in high, low burn severity areas and unburned forest areas, as well as the statistical LAI and FAPAR data every 8 days from 1981 to 2016 and annual LAI and FAPAR data from 1982 to 2015 in these areas;
(5) Spatial distribution data of land cover within the burned area in 2000, 2004, 2008 and 2012 with a spatial resolution of 500 m, as well as the statistical area proportion data of each land cover type from 2000 to 2013.

The dataset is stored in .shp, .tif and .xlsx formats, containing 58 data files with a total size of 206 MB (compressed into a single data file of 60.7 MB).

搜集汇总

背景与挑战

背景概述

该数据集记录了1987年大兴安岭森林大火对植被的影响，包括火灾范围、强度及植被恢复情况。数据集基于Landsat TM数据，通过计算dNBR、LAI和FAPAR等指标，分析了火灾前后植被的变化，并提供了多种空间和时间分辨率的数据。