川西高原光果西南杨人工林生物量及生产力的研究

Studies on the Biomass and Production of Populus schneideri var.tibetica Plantation

采用标准木和回归分析法 (乔木层 )及样方收获法 (灌木、草本 )研究了川西高原丘陵宽谷地带光果西南场人工林的生产力生物量及其分配规律。1 根据各径阶标准木资料 ,对 4个回归模型 (a)Y =a +bX ,(b)Y =aXb,(c)Y =aebX,(d)Y =a +b1nX 的适应性进行评价、筛选 ,结果以 (b)的相关系数最高 ,精度符合要求。2 林分总生物量为 6 1 371t·hm-2 ,其中乔木层 5 8 391t·hm-2 (95 14 0 % ) ,灌木层 1 0 90t·hm-2 (1 780 % ) ,草本层 1 890t·hm-2 (3 0 8% ) ;乔木层净生产量为 9 342t·hm-2 ·a-1,约 38 5 14 %分配到树干。3 林分总生物量及树干生物量随高度分布呈金字塔型 ,枝、叶生物量主要集中分布在树冠中上部 ;根系生物量随土壤深度的增加逐渐减少 ,呈倒金字塔形 ,根生物量占林分总生物量的 2 8 84 % ,主要分布于 0～ 6 0cm的土层中。4 地上部分生物量和总生物量分别是树干生物量的 1 2 8倍和 1 8倍 ,和其它热带、亚热带森林分析的结果相似。

Biomass Production and its allocation of the Populus schneideri var.tibetica plantation was studied on the standard trees and regression analysis(for tree layer),and clear cut(for shrub and herbaceous Layer). 1.Four regression models:(a)Y=a+bX,(b)Y=aX b,(c)=ae bX and(d)Y=a+bln X Could be successfully applied to the Plantation among which(b)had generally high r values,precision come up to the required standard. 2.Biomass of the plantation was 61 371t·hm -2 among which trees layer 58 391t·hm -2 (95 140%),shrub layer 1 090?t·hm -2 (1 780%),herbaceous layer 1 899t·hm -2 (3 080%).The net production of tree layer was 9 342?t·hm -2 ·a -1 ,of which trunk accounted for 38 514%. 3.Vertical allocation of total biomass and trunk biomass showed a pyramid pattern,but that of branch and leaf biomass distributed mainly in the middle and upper part of the crown.Root biomass decreased with the depth of soil,showed a reverse pyramid pattern.Root biomass accounted for 28 84% of total biomass,distributed domintantly in 0～60?cm soil layer. 4.Aboveground and total biomass were 1 28 and 1 8 times that of trunk respectively.Analysis on other tropical and subtropical forests also provided similar results.