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不同林龄杉木人工林林下植物组成及其生物量变化 预览 被引量:18

Variety of Biomass in Plantation Under-storey Species Composition and Different Age Cunninghamia lanceolata
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摘要 在地处广西凭祥市的中国林业科学研究院热带林业实验中心的大青山地区,选择三个不同年龄阶段的杉木人工林,采用空间代替时间的研究方法,研究林下植物组成及生物量变化。结果显示:不同年龄阶段的杉木人工林林下植被的物种丰富度差异不大,在1800m^2样地内有植物48~54种,但其优势物种的生物生态学特性差异较大,幼林以阳性物种葛藤(Pueraria thunber giana)、铁芒萁(Dicranopteris dichotoma)等占绝对优势,中龄林中的优势种则是耐荫物种玉叶金花(Mussaendapubuscens)、凤尾蕨(Pteris nervosa)等,成熟林中的优势物种是大沙叶(Aporosa chinensis)、蔓生莠竹(Microstegium vagans)等中生偏荫性的物种。不同龄林林下植被的生物量差异很大,表现为成熟林〉幼龄林〉中龄林,尤其是中龄林生物量与其他两个林龄最为明显,其中成熟林是其3.35倍,幼龄林是其2.7倍。人工林林分郁闭度和冠层结构左右着林下植物组成及生物量格局。 Three stand age gradations' biomass and species composition of under-storey were compared and analyzed, respectively, in Cunninghamia lanceolata plantations. These plantations lie in part region of Daqing Mountain which belongs to the Experimental Center of Tropical Forestry, Chinese Academy of Forestry Science, Pingxiang city, Guangxi province. In this research,space is studied as object instead of time. The result shows that: compared with different stand age gradations,the diversity of under-storey species richness is not so obvious. There is about 48~54 plant species per 1800 m^2 in plot. However, the bio-ecological characteristics differences among dominant species are evident. The heliophilous species such as Pueraria thunbergiana,Dicranopteris dichotorna etc. are preponderant in sapling plantations. Mussaenda pubuscens,Pteris nervosa and other shade species are dominant in composite plantations. Meanwhile dominant species in mature plantations is half-shady species such as Aporosa chinensis,Microstegium vagans etc. Under-storey biomass variety of different stand ages is significant. The rule shows as follows: biomass of mature plantation〉biomass of sapling plantation〉biomass of composite plantation. Compared with other two stand age gradations,biomass of composite plantation differentiates most evidently. Mature plantation' biomass is 3.35 times of composite plantation's. Biomass of sapling plantation' is 2. 7 times of composite plantation' s. Both canopy density and crown structure of plantation dominate species composition and biomass pattern of under-storey.
作者 刘磊 温远光 卢立华 郭东升 LIU Lei, WEN Yuan-guang, LU Li-hua ,GUO Dong-sheng(1. College of Forestry, Guangxi University, Nanning, Guangxi, 530005, China ; 2. Experiment Center of Tropical Forestry ,CAF ,Pingxiang ,Guangxi, 532600 ,China)
出处 《广西科学》 CAS 2007年第2期 172-176,共5页 Guangxi Sciences
关键词 杉木 林下植被 重要值 生物量 Cunninghamia lanceolata, under-storey, importance value, biomass
作者简介 刘磊(1980-),男,硕士研究生,主要从事林业生态研究工作。
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