基于分层的34a生人促木荷林树种组成与多样性

Tree Species Composition and Diversity of 34 Year-old Schima superba Forest by AMPR Based on Stratification

34a生人促木荷林乔木层层次结构分化明显,应用最大受光面(MLRP)法可将乔木层明显划分为2个亚层,第Ⅰ亚层树高≥16.5m。乔木层共有33种树种,木荷重要值最大,达28.68%,是典型的木荷群落;第Ⅰ亚层有8种树种,木荷占绝对优势,重要值达49.77%;第Ⅱ亚层有30种树种。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33,4.37,0.87和0.08,其中第Ⅰ亚层分别为8,2.40,0.48,0.26;第Ⅱ亚层分别为30,4.41,0.88,0.06。全林平均胸径14.2cm,平均树高18.4m,株数密度1875株/hm2,单位面积蓄积量262.9m3/hm2。第Ⅰ亚层和第Ⅱ亚层的平均胸径分别为23.9cm和9.6cm,平均树高分别为21.9m和12.1m。第Ⅰ亚层和第Ⅱ亚层的株数密度分布占全林的23.0%和77.0%,单位面积蓄积量分布占全林的75.2%和24.8%。

The tree stratum of 34-year-old Schima superba forest by AMPR(Artificial Measures Promoting Regeneration)was stratified obviously to 2 sub-strata(sub-stratum I and sub-stratum II)by MLRP(Maximum Light Receiving Plane)method.The tree height in sub-stratum I was higher than or equal to 16.5 m.It was typical S.superba community which was composed by 33 tree species and the important value of S.superba(the dominant tree species)was 26.68%.There were 8 and 30 tree species in sub-stratum I and sub-stratum II respectively.The important value of S.superba(the absolutely dominant tree species)in sub-stratum I was 49.77%.Its species richness(R),Shannon-Wiener index(SW),evenness(E)and ecological dominance(ED)in tree stratum were 33,4.37,0.87 and 0.08 respectively.Which in sub-stratum I were 8,2.40,0.48 and 0.26 respectively and in sub-stratum II were 30,4.41,0.88 and 0.06 respectively.Its average stand DBH,height,density and growing stock in tree stratum were 14.2 cm,18.4 m,1 875 N/hm 2 and 262.9 m 3/hm 2 respectively.Its average stand DBH in sub-stratum I and sub-stratum II were 23.9 cm and 9.6 cm respectively.Its average stand height in sub-stratum I and sub-stratum II were 21.9 m and 12.1 m respectively.Its percentage of stand density in sub-stratum I and sub-stratum II were 23.0%and 77.0% respectively.Its percentage of growing stock in sub-stratum I and sub-stratum II were 75.2% and 24.8% respectively.