Moreno José M, Oechel Walter C
Department of Biology, San Diego State University, 92182, San Diego, CA, USA.
Oecologia. 1993 Oct;96(1):95-101. doi: 10.1007/BF00318035.
Changes in the population structure of the lignotuberous resprouter Adenostoma fasciculatum were investigated by experimentally burning at various intensities an old stand in southern California chaparral. Survival after fire, time of resprouting, herbivory, and survival after resprouting were monitored for more than 1 year after the fire. Greater fire intensity increased plant mortality and the size of plants that died as a consequence of the fire. Time from the fire until resprouting increased with increasing fire intensity and was related to plant size: the larger the plants the earlier they resprouted. Post-resprouting mortality also increased with fire intensity and was related to time of resprouting. Herbivory increased with fire intensity and the size of plants affected by it changed with the intensity of the fire. Fire intensity had profound direct and indirect effects on the population structure of Adenostoma fasciculatum. Plant size strongly determined the direct and indirect lethal effects of fire.
通过在南加州灌丛的一片老林中进行不同强度的实验性焚烧，研究了木质块茎萌生植物束花腺柳（Adenostoma fasciculatum）种群结构的变化。火灾发生后一年多的时间里，监测了火灾后的存活率、重新发芽的时间、食草情况以及重新发芽后的存活率。更高的火灾强度增加了植物死亡率以及因火灾而死亡的植物大小。从火灾发生到重新发芽的时间随着火灾强度的增加而延长，并且与植物大小有关：植物越大，重新发芽越早。重新发芽后的死亡率也随着火灾强度的增加而上升，并且与重新发芽的时间有关。食草情况随着火灾强度的增加而增加，受其影响的植物大小也随着火灾强度而变化。火灾强度对束花腺柳的种群结构产生了深远的直接和间接影响。植物大小强烈地决定了火灾的直接和间接致死效应。
