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A comparative study of aboveground biomass of three Mediterranean species in a post-fire succession

机译:火后演替中三种地中海物种地上生物量的比较研究

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The aboveground biomass of three woody species (Cistus albidus, Quercus coccifera and Pinus halepensis) in two early successional stages (3- and 10-year old) of a post-fire Mediterranean ecosystem was investigated. Among these three species, which belong to the successional series of holm oak (Quercus ilex), C albidus and Q. coccifera are two dominant shrub species in the garrigue ecosystem and P halepensis is a pioneer tree species widely represented in the Mediterranean area. The results obtained showed that in monospecific stands, C albidus and Q. coccifera had a high recovery potential. In the 3-year-old stands, the cover of P. halepensis was only 19.8% for a total biomass of 0.75 +/- 0.21 t ha(-1), while the plant cover of C. albidus and Q. coccifera was, respectively, 26% and 85.5% and biomass was 4.72 +/- 1.09 and 11.5 +/- 0.16 t ha(-1). Only 10 years after fire, the plant cover of C albidus and Q. coccifera was, respectively, 55% and 100% and total biomass 13.2 +/- 1.7 and 35.8 +/- 4.7 t ha(-1). The greatest increase in biomass was noted for P halepensis (29.7 t ha(-1)). If mean annual biomass increments are considered, it appears that there was a significant decrease with the stand age for the two shrub species although the tree species showed an increase in productivity. These differing patterns in biomass and productivity of shrub and tree species with stand age provide information on biomass accumulation rates of pioneer species in a Mediterranean succession and their importance in the vegetation dynamics. (C) 2003 Elsevier SAS. All rights reserved.
机译:研究了火后地中海生态系统的两个早期演替阶段(3岁和10岁)的三种木本物种(Cistus albidus,Quercus coccifera和Pinus halepensis)的地上生物量。在这三个树种中,它们属于圣栎(演栎)的连续系列,C albidus和Q. coccifera是garrigue生态系统中的两个优势灌木种,而halepensis是地中海地区广泛存在的先锋树种。所获得的结果表明,在单特异性林分中,C albidus和Q. coccifera具有很高的恢复潜力。在3年生的林分中,哈勒木假单胞菌的覆盖率仅为19.8%,总生物量为0.75 +/- 0.21 t ha(-1),而假山假丝酵母和球孢Q.分别为26%和85.5%,生物量为4.72 +/- 1.09和11.5 +/- 0.16 t ha(-1)。火灾后仅10年,白花念珠菌和球孢Q.的植物覆盖率分别为55%和100%,总生物量为13.2 +/- 1.7和35.8 +/- 4.7 t ha(-1)。注意到哈里木对虾(29.7 t ha(-1))的生物量增加最大。如果考虑平均年生物量增加,尽管树种显示出生产力的提高,但似乎两种灌木种的树龄随着年龄的增长而显着下降。这些具有不同年龄的灌木和树木物种的生物量和生产力的不同模式提供了有关地中海演替中先驱物种生物量积累速率及其在植被动态中的重要性的信息。 (C)2003 Elsevier SAS。版权所有。

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