Effects of fire and drought in a tropical eucalypt savanna colonized by rain forest
Effects of fire and drought in a tropical eucalypt savanna colonized by rain forest
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DOI：
10.1046/j.1365-2699.2003.00934.x
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发表时间：
2003-09-01
影响因子：
3.9
通讯作者：
Bowman, DMJS
中科院分区：
文献类型：
--
作者：
Fensham, RJ;Fairfax, RJ;Bowman, DMJS
目的本研究记录了多次火灾和干旱对北澳大利亚热带稀树草原木材结构的影响。该研究是在一个500公顷的桉树为主的热带稀树草原上进行的，周围是晚第四纪熔岩流。该流被称为玄武岩长城，位于半干旱的澳大利亚东北部查特斯堡东北约50公里处。该地区在1992年至1996年期间遭遇了有记录以来最大的5年降水不足。方法在1.56 ha的样地内对所有木本植物进行标记。物种按生境亲缘关系（热带雨林、过渡带、稀树草原）和更新策略（呼吸机、播种机）进行分类。研究人员分析了这些类别中植物的存活率与第一次火灾的火灾强度以及1996年至2001年间发生的四次火灾的火灾强度的关系。结果第一次火灾发生前，样地共有31种树种，其中21种为周围典型干雨林树种。这些热带雨林物种以小个体为代表，构成多样
Aim This study documents the effects of multiple fires and drought on the woody structure of a north Australian savanna never grazed by domestic stock.Location The study was conducted in a 500 ha pocket of Eucalyptus-dominated savanna surrounded by a late Quaternary lava flow. The flow is known as the Great Basalt Wall, located c. 50 km northeast of Charters Towers in semi-arid north-eastern Australia. This region was exposed to the largest 5-year rainfall deficit on record between 1992 and 1996.Methods All individual woody plants were tagged within a 1.56 ha plot. Species were segregated into their habitat affinities (rain forest, ecotone, savanna) and regeneration strategy (resprouter, seeder). The survivorship of plants within these categories was analysed in relation to fire intensity from the first fire, and to each of four fires lit between 1996 and 2001.Results Before the first fire, the plot contained thirty-one tree species including twenty-one typical of the surrounding dry rain forest. These rain forest species were represented by small individuals and constituted