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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >A comparison of fire severity measures: an Australian example and implications for predicting major areas of soil erosion.
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A comparison of fire severity measures: an Australian example and implications for predicting major areas of soil erosion.

机译：火灾严重性措施的比较：澳大利亚的一个例子，对预测水土流失的主要地区具有重要意义。

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摘要

Modelled results of two popular fire severity measures NBRdiff and NDVIdiff were compared with field data for two small wildfires that occurred in eucalypt-dominated forest near Sydney, Australia during the spring of 2006. NBRdiff and NDVIdiff are computed by differencing specific spectral reflectance properties of satellite images captured before and after the fire event. In this case indices were derived from the Landsat 5 Thematic Mapper platform. It is demonstrated that the spatial distribution of severity classes computed using NBRdiff were not statistically different to severity classes computed for NDVIdiff in the Tallowa fire, which was a 'hot' burn. However, in the 'cooler' Thirlmere Lakes fire, their respective classifications differed significantly. NBRdiff was clearly superior to NDVIdiff in discriminating lower fire severities, which predominantly burn understorey vegetation whilst leaving the canopy un-scorched. It is also demonstrated using post-fire soil profiles from 50 sample sites that charring depth, which is related to the hydrophobic properties of the soil landscape, is significantly correlated to fire severity. This has important implications for the probability of developing a soil erosion risk model based on remotely sensed data, because in this environment, charred soil landscapes will have lost some of their naturally highly water repellent behaviour during burning, which in turn alters their susceptibility to overland flow development and surface wash erosion.
机译：将两种流行的火灾严重程度度量标准NBRdiff和NDVIdiff的模型结果与2006年春季在澳大利亚悉尼附近以桉树为主的森林中发生的两次小型野火的实地数据进行了比较。火灾之前和之后捕获的图​​像。在这种情况下，索引来自Landsat 5 Thematic Mapper平台。结果表明，使用NBRdiff计算的严重性等级的空间分布与塔洛拉大火（热灼伤）中针对NDVIdiff计算的严重性等级没有统计学差异。但是，在“凉爽的”瑟米尔湖大火中，它们各自的分类存在显着差异。 NBRdiff在区分较低的烈度方面明显优于NDVIdiff，后者主要燃烧下层植被，而使树冠不焦。使用来自50个采样点的火灾后土壤剖面也证明，炭化深度与土壤景观的疏水性有关，炭化深度与火灾严重程度显着相关。这对于基于遥感数据开发土壤侵蚀风险模型的可能性具有重要意义，因为在这种环境下，烧焦的土壤景观在燃烧过程中会失去其某些天然的高度疏水性，从而改变了其对陆地的敏感性流动发展和表面洗蚀。

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