基于分层的典型猴欢喜天然林特征分析

Characteristics Analysis of Typical Natural Forest of Sloanea sinensis Based on Stratification

典型猴欢喜天然林林层分异明显,乔木层可明显划分为3个亚层,最大受光面高度为16.5 m。乔木层共有50种树种,树种组成丰富,猴欢喜重要值为16.07%。第Ⅰ亚层、第Ⅱ亚层和第Ⅲ亚层组成树种分别为11种、15种和38种,有木荷、浙江桂、观光木、乐东拟单性木兰、蓝果树、福建含笑、刺叶野樱、深山含笑、少叶黄杞等高价值或珍贵树种。乔木层物种丰富度S、多样性指数SW、均匀度E和生态优势度ED分别为50,4.56,0.81和0.09,其中第Ⅰ亚层分别为11,3.03,0.88和0.16,第Ⅱ亚层分别为15,3.23,0.83和0.17,第Ⅲ亚层分别为38,4.30,0.82和0.09。林分平均胸径26.1 cm,平均树高28.06 m,株数密度912株/hm2,单位面积蓄积量590.58 m3/hm2。林分单位面积蓄积量高。第Ⅰ亚层、第Ⅱ亚层和第Ⅲ亚层的单位面积蓄积量占比分别为75.8%,18.1%和6.1%,株数密度占比分别为10.1%,20.6%和69.3%。

The tree stratum of typical natural forest of Sloanea sinensis is stratified obviously to 3 strata(stratum I,stratum II and substratum III).The height of the Maximum Light Receiving Plane(MLRP)is 16.5 m.The forest is composed by 50 tree species and the important value of Sloanea sinensis is 16.07%.There are 11,15 and 38 tree species in stratum I,stratum II and stratum III respectively.There are many rare or high-value timber species,such as Schima superba,Cinnamomum chekiangense,Tsoongiodendron odorum,Parakmeria lotungensis,Nyssa sinensis,Michelia fujianensis,Prunus spinulosa,Michelia maudiae and Engelhardtia fenzlii.Its species richness(R),Shannon-Wiener index(SW),evenness(E)and ecological dominance(ED)in tree stratum are 50,4.56,0.81 and 0.09 respectively,which in stratum I are 11,3.03,0.88 and 0.16 respectively,in stratum II are 15,3.23,0.83 and 0.17 respectively,in stratum III are 38,4.30,0.82 and 0.09 respectively.Its average stand DBH,height,density and growing stock in tree stratum are 26.1 cm,28.06 m,912 N/hm2 and 590.58 m3/hm2respectively.Its percentage of stand density in stratum I,stratum II and stratum III are 10.1%20.6%and 69.3%respectively.Its percentage of growing stock in stratum I,stratum II and stratum III are 75.8%,18.1%and 6.1%respectively.