Effects of micro-topographies on stand structure and tree species diversity in an old-growth evergreen broad-leaved forest, southwestern Japan
Effects of micro-topographies on stand structure and tree species diversity in an old-growth evergreen broad-leaved forest, southwestern Japan
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日本西南部古老常绿阔叶林微地形对林分结构和树种多样性的影响
DOI：
10.1016/j.gecco.2015.06.010
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Nishimura,N. & Manabe,T.
中科院分区：
文献类型：
--
作者：
Do,V.T.;Sato,T.;Saito,S.;Kozan,S.;Yamagawa,H.;Nagamatsu,D.;Nishimura,N. & Manabe,T.
根据日本西南部原始森林的微地形，研究了林分结构和物种多样性。研究在200×200 m 2 永久样地中进行，采用10 m×10 m网格划分为400个子样地。根据林地坡度和样地位置，子小区分为坡顶（CS）、头凹（HH）、上坡（US）和下坡（LS）四种微地形，以及450 m以下和450 m以上两个海拔区域。 2009年和2013年对胸径（DBH）≥5 cm的所有个体进行了树木普查。结果表明，CS的子区活茎、死茎、胸径、断面积（G）和断面积增量（▵G）均值显着高于LS。同时，招募的茎均值和香农多样性指数显着较低。 450 m以下和450 m以上海拔区域的比较表明，450 m以上海拔区域的林分结构和物种多样性参数明显较高。土壤条件的差异导致微地形间活茎密度、物种密度、胸径、G、▵G的差异。因此，应鼓励山顶坡、上坡和高海拔地区进行碳积累和储存。同时，低海拔地区应用于物种多样性保护。
Stand structure and species diversity were studied in correspondence with micro-topographies in an old-growth forest in southwestern Japan. The study was conducted in a 200× 200 m 2 permanent plot, which were divided into 400 subplots using grids of 10 m× 10 m. Subplots were categorized to four micro-topographies as crest slope (CS), head hollow (HH), upper slope (US) and lower slope (LS), basing on slope of forest floor and plot position, and to two elevational zones as below 450 m and above 450 m. Tree censuses for all individuals with diameter at breast height (DBH)⩾ 5 cm were conducted in 2009 and 2013. The results indicated that CS had subplot means of living stems, dead stems, DBH, basal area (G), and basal area increment (▵ G) significantly higher than that in LS. While, means of recruited stems and Shannon diversity index were significantly lower. Comparing between below and above 450 m elevational zones indicated the significantly higher parameters of stand structure and species diversity in above 450 m elevational zone. The differences of edaphic conditions led to difference of density of living stems, species density, DBH, G, and▵ G among micro-topographies. Therefore, crest slope, upper slope, and higher elevational zones should be encouraged for the purposes of carbon accumulation and storage. While, the lower elevational zones should be used for the purposes of species diversity conservation.