南岭自然保护区常绿阔叶林枯立木数量特征分析

Quantitative characters of standing dead trees of the evergreen broadleaved forest in Nanling National Nature Reserve,Guangdong,China

采用典型取样法,对南岭国家级自然保护区常绿阔叶林枯立木数量特征进行了研究。结果表明:(1)南岭国家级自然保护区0.9 hm2的常绿阔叶林样地共有枯立木59株,27种,分属于16科23属。优势科为山茶科、壳斗科、大戟科和樟科。白锥、马尾松、红背锥、黄樟、青檀的重要值之和占样地枯立木总重要值的60%以上。(2)不同保护条件下,南岭国家级自然保护区常绿阔叶林枯立木数量特征表现不一,并非保护程度越高枯立木数量优势越明显。受保护条件最弱的试验区枯立木丰富度、多度、总胸高断面积和径级结构都最小,保护条件较好的缓冲区和核心区枯立木径阶分配比较均匀,但缓冲区枯立木的总胸高断面积却比核心区的多。(3)多响应置换过程分析和指示种分析揭示,枯立木对群落生境有明显的指示作用。不同保护条件下有不同的枯立木指示种(P<0.05)。

Using the classic survey method, quantitative characters of standing dead trees of 3 forest communities under different protection regimes i. e. , the experimental area, the buffer area and core area, respectively, each represented by 30 plots, in Nauling National Nature Reserve in Guangdong Province were studied. The results showed that： （ 1 ） 57 stems, 29 species in 23 genera and 15 families of standing dead trees were found in the 0.9 hm2 plot. Dominant families of the flora were Thnaceae, Fagaceae, Euphorbiaceae, Lanraeeae. The total of important value of Castanopsis fabric Hance, Pinus massoniana Lamb. , Castanopsis fargesii Franch. , Cinnamomum parthenoxylon （Roxb.） Kost. , Pteroceltis tatarinowii Maxim. account for more than 60% of the whole important value. （2） There was significant difference in quantitative characters of standing dead trees under dif- ferent protection conditions. It is difficult to conclude that quantitative characters of standing dead trees with higher protection are better. The experimental area with the least protection, had the least species richness, abundance, total basal area, and size-class structure of standing dead trees than the other two. The buffer area and core area with higher protection had uniform size-class structure of standing dead trees, while the total basal area of standing dead trees of buffer area was more than that of core area. （3） The analysis of multi-response permutation procedures （MRPP） and indicator species analysis （ISA） identified that standing dead trees had a significant influence on the community habitat. There were different indicator species under different protection conditions.