基于年轮信息的单株胡杨(Populus euphratica)树干年新增生物量估算方法

doi:10.13866/j.azr.2018.04.19

摘要/Abstract

摘要： 胡杨作为塔里木河荒漠河岸林的关键树种,对水土保持、抑制沙漠化等发挥着重要的生态作用。胡杨生物量是研究荒漠河岸林生态系统的功能与服务的重要指标。胡杨是国家二级保护树种,也是扎根沙漠的唯一乔木树种,十分珍贵,难以大规模使用破坏性方法进行测量,因此针对胡杨的生物量计算一直是个难题。通过对胡杨破坏性较低的采样方法,提取不同树干高度下的胡杨树轮信息,实验结果表明 :① 不同高度的树轮生长量之间存在显著的相关性,平均相关性系数为0.878;在树干0~0.5 m、0.5~1 m、1~1.5 m、1.5~2 m和2~2.5 m高度,树干密度分别为500.2 kg·m^-3、475.6 kg·m^-3、502.2 kg·m^-3、477.2 kg·m^-3和420.194 kg·m^-3,平均密度为471.4 kg·m^-3,标准差为32.7;② 在获得树干不同高度下的树轮信息和树干密度基础上,可以准确计算出1株胡杨树干年生物量,在实验中1株胡杨树干的0.5~1.5 m高度处,长为1 m的树干在1997—2013年的年新增生物量为0.61~1.54 kg,年平均新增生物量为0.92 kg,在2002—2003年生物量增幅明显,年平均新增生物量为1.54 kg。笔者使用的树干生物量计算方法对林木破坏性小且可操作性强,能计算出树干新增生物量,对研究胡杨新增生物量和生态价值的变化具有重要意义。

关键词: 胡杨(Populus euphratica), 单株, 年生物量, 树木年轮, 塔里木河下游

Abstract: In the downstream of the Tarim River,Populus euphratica is the key species in desert forests which play a crucial role of protecting the local ecological environment and alleviating wind-blown sand disasters.Biomass of P.euphratica is an important index in studying the functions and services of desert riparian forest ecosystem.P.euphratica, the only tree species in the desert in China,is a national second-class protected plant species with high value for its rareness.Therefore,the common destructive ways cannot be used to study the tree biomass,and it is difficult to precisely measure the biomass.In this research,an innovatively destructive way was used to collect the samples so as to calculate the values of annual stem biomass.For an individual tree,the experiment samples were taken from different heights of its stem to attain the corresponding tree-ring width.The results are as follows: ① There were the significant correlations between the tree-ring growth at different heights,and the average Pearson correlation coefficient was 0.878.The trunk densities at heights of 0-0.5,0.5-1,1-1.5,1.5-2 and 2-2.5 m were 500.2,475.6,502.2,477.2 and 420.194 kg·m^-3 respectively,and the standard deviation was 32.7; ② Based on the information of tree-ring and trunk densities at different heights,the values of annual biomass of P.euphratica can be calculated accurately.In the experiment,the annual biomass of trunk at 0.5-1.5 m height varied in a range of 0.61-1.54 kg during the period of 1997-2013,and the average annual biomass was 0.92 kg.During the period from 2002 to 2003,the annual biomass increased obviously,and the average annual biomass was 1.54 kg.The sampling way in this research was less destructive and easy to operate,and could be effectively applied in practical use for calculating the annual aboveground biomass of individual P.euphratica trees.The estimation of annual stem biomass is of great significance for studying the change of ecological value of desert riparian forest.

Key words: Populus euphratica, individual plant, annual biomass, tree-ring, lower, Tarim River

黄运梅, 徐海量, 张广朋, 赵新风. 基于年轮信息的单株胡杨(Populus euphratica)树干年新增生物量估算方法[J]. 干旱区研究, 2018, 35(4): 905-911.

HUANG Yun-mei, XU Hai-liang, ZHANG Gaung-peng, ZHAO Xin-feng. Estimation of Annual Biomass of Individual Populus euphratica Based on Tree-ring Data[J]. Arid Zone Research, 2018, 35(4): 905-911.

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