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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Effects of bark beetle-caused tree mortality on biogeochemical and biogeophysical MODIS products
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Effects of bark beetle-caused tree mortality on biogeochemical and biogeophysical MODIS products

机译:树皮甲虫致死率对生物地球化学和生物地球物理MODIS产品的影响

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Disturbances affect forest-atmosphere exchanges of carbon, water, and energy, thereby influencing weather and climate. Bark beetle outbreaks are one such disturbance type that alters biogeochemical and biogeophysical processes in forests. Few studies have documented bark beetle impacts to leaf area index (LAI), gross primary productivity (GPP), evapotranspiration (ET), land surface temperature (LST), and surface albedo with satellite observations. Our objective was to use Landsat-derived estimates of bark beetle-caused tree mortality and Moderate Resolution Imaging Spectroradiometer (MODIS) land surface products to estimate beetle-caused changes in LAI, GPP, ET, LST, and surface albedo in northern Colorado. Following bark beetle-caused tree mortality, decreases occurred in LAI (0.02-0.80 m~2m~(-2), 1-40%), annual GPP (50-248 gC m~(-2) yr~(-1), (5-26%), and daily summer ET (0.20-0.70 mm day-1, 13-44%), whereas increases occurred in August LST (1-3.9 K) and February albedo (0.03-0.09, 19-52%). We found greater responses of these variables in areas of greater mortality severity. The extent and severity of tree mortality in northern Colorado caused substantial changes in land surface variables (9-23%) when averaged across all forested areas of our study area. Our results demonstrate that land surface variables are sensitive to bark beetle-caused tree mortality and that bark beetle outbreaks can significantly impact biogeochemical and biogeophysical processes.
机译:干扰会影响森林与大气之间碳,水和能量的交换,从而影响天气和气候。树皮甲虫暴发就是其中一种干扰类型,它改变了森林的生物地球化学和生物地球物理过程。很少有研究通过卫星观测记录树皮甲虫对叶面积指数(LAI),总初级生产力(GPP),蒸散量(ET),地表温度(LST)和地表反照率的影响。我们的目标是使用Landsat得出的由树皮甲虫引起的树木死亡率估计值和中等分辨率成像光谱仪(MODIS)地表产品来估计科罗拉多州北部LAI,GPP,ET,LST和地表反照率由甲虫引起的变化。继树皮甲虫引起的树木死亡率之后,LAI(0.02-0.80 m〜2m〜(-2),1-40%),年度GPP(50-248 gC m〜(-2)yr〜(-1)降低了,(5-26%)和夏季夏季ET(第1天为0.20-0.70 mm,13-44%),而8月LST(1-3.9 K)和2月反照率(0.03-0.09,19-52)增加%)。我们发现这些变量在死亡率严重程度更高的地区有更大的反应,在我们研究区域的所有森林地区取平均值时,科罗拉多州北部树木的死亡率和严重程度导致土地表面变量发生重大变化(9-23%)我们的结果表明,地表变量对由树皮甲虫引起的树木死亡率敏感,树皮甲虫的爆发可显着影响生物地球化学和生物地球物理过程。

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