四川红杉人工林分生物量和生产力的研究

A STUDY ON BIOMASS AND PRODUCTIVITY OF LARIX MASTERSIANA PLANTATION IN SICHUAN

本文对卧龙自然保护区60年代人工栽培的四川红杉林分生物量和生产力进行了测定和研究。按“径阶标准木法”和“样方收割法”分别调查了乔木层、灌木层、草本地被层和枯枝落叶层。据调查数据,应用“相对生长法则”建立了估测乔木层单株木各器官干重的回归方程,相关系数均达到极显著水平。文中还研究了林分平均净生产量和产量结构。结果表明:四川红杉人工林分生物量平均为135.17t/ha,净生产量为10820.52kg/ha·a,其中乔木层生物量为113.57t/ha,占林分生物量的84.02%,净生产量为8951.63kg/ha·a,占林分净生产量的82.73%。林分中灌木层、草本层的生物量和净生产量分别占林分生物量和净生产量的1.01%和3.16%、4.44%和13.86%。枯枝落叶层现存量为14.23t/ha,占林分的10.53%,林分年凋落物量和枯损物量为3996.14kg/ha·a,占林分生产力的36.93%。

In this paper, the biomass and productivity of 22-year old Larixmastersiana plantation at an altitude of 2300m in Wolong Natural Reserveare studied. The biomasses of trees, shrubs, herbs, and dead branchesand leaves in L.mastersiana stand were investigated using the 'average st-andard tree' and 'divided storeys' methods. The regression equation of thedry weight of each organ of L.mastersiana were derived as WT=0.0422(D^2H)^(0.8533); W_B=0.0051(D^2H)^(0.8933); W_(Br)=0.0016(D^2H)^(0.8519); W_L=0.0048(D^2H)^(0.7641); W_R=0.001(D^2H)^(1.0755). The estimated total biomass of L.mastersiana stand is 135.17t/ha, theproductivity is 10820.52kg/ha·a. Total aboveground biomass is 113.57t/ha,and the productivity is 8951.63kg/ha·a, in which the percentage of trun-ks, barks, branches, leaves and roots are 54.84%, 9.76%, 15.77%, 3.50%,and 16.13% respectively. The biomass percentages of L.mastersiana, shru-bs, herbs and dead branches and leaves are 84.02%, 1.01%, 4.44% and10.53% respectively. The productivity percentages of L. mastersiand, shrubsand herbs are 82.73%, 3.17% and 13.86% respectively. Annual litter anddrying trees productivity of L.mastersiana stand is 3996.14kg/ha·a, andthe percentage is 36.93%.