立地条件对青檀人工林生物生产力及檀皮产量的影响

研究了青檀人工林不同立地条件下林上部分生物量，干物质分配模式和出皮率，结果表明：（1）立地条件较好的综合土壤因子为：板岩母质，壤性土，中性土质，土壤A层厚度＞20cm；（2）地上部分叶，木质部和檀皮在地上三部分中所占比例大致相同，木质部分别是檀皮，叶重量的6．83倍和5．98倍；（3）在3年生萌生条中，各段的檀皮产量大小顺序为3年生段＞2年生段＞1年生段。3年生段檀皮产量分别是2年生段，1年生段的1．94倍和3．61倍；（4）不同立地条件可归并为3个类型（A，B，C），A的出皮率为11．66％，B的出皮率为10．95％，C的出皮率为10．81％，单位面积檀皮疸大小顺序为A＞B＞C。

The Effects of Site Conditions on Above ground Biomass Production and Bark Yield of Pteroceltis tatarinowii Plantations

Based on the investigation of 33 plots in Jing County and Qingyang County, the effects of site conditions on above ground biomass and bark yields, and effects of site conditions on the bark production were studied and analysed. The results indicated that:(1) Parent rock, soil texture, pH and depth of top soil were a significant influence on above ground biomass production and bark production of Pteroceltis tatarinowii plantations. Overall the highest above ground biomass production or bark production was achieved in the site condition with loam soil, where parent rock is slate, pH is less than 6.5, and depth of top soil is more than 20 cm. (2) The distribution pattern of above ground biomass components was in order of xylem>leaf>bark, and the biomass production of xylem was 6.83 times of the bark, 5.98 times of the leaf.(3) In the stand of 3 year old, the bark production could be divided into 3 parts according to the growth period. The highest bark production was achieved in the section of 3 year old, and the lowest was in the section of 1 year old. The bark production in the section of 3 year old is 1.94 times of 2 year old, 3.61 times of 1 year old. (4) The different site can divide into 3 types (A,B,C). Type A has the highest above ground biomass production or bark production than type B and type C. The rate of bark biomass to above ground biomass is 11.66% in type A, 10.95% in type B,and 10.81% in type C.