摘要
本文对岷江上游干旱河谷区引种栽培的5a生辐射松幼林生物量和生产力进行了测定和研究,用"平均标准木法"和"样方收获法"分别调查了乔木层、灌木层、草本层、苔鲜层和凋落物层的生物量。据调查数据,用"相对生长法则"建立了乔木层单株立木及其各器官干重的回归方程,方程的精度均在97%以上。同时还研究了林分平均净生产量和产量结构。结果表明:岷江上游干旱河谷区5a生辐射松人工林分生物量平均为19 507t/hm2,净生产量为3902 40kg/(hm2·a)。其中,乔木层生物量为8 510t/hm2,占林分总量的43 62%;净生产量1 702t/(hm2·a),占林分净生产量的43 63%。灌木的生物量和净生产量分别为2 171t/hm2、434 20kg/(hm2·a);草本的生物量和净生产量分别为8 091t/hm2、1618 20kg/(hm2·a);苔鲜层的生物量和净生产量分别为0 464t/hm2、92 80kg/(hm2·a);凋落物的生物量和净生产量分别为0 271t/hm2、54 20kg/(hm2·a)。辐射松人工林与同区域同龄油松和岷江柏相比,其生物量和生产力都远高于它们。
A preliminary research was conducted on biomass and productivity of five years old Pinus radiata plantations in the arid river valley areas of the upper reaches of the Minjiang River,and methods of 'average stand tree' and 'quadrat yield' were used for the investigation of the biomass of arbor,bush,herb,moss and litter layers.The following regression equations were divided from the standing crop of the destructive trees:W_t=3.03201(D^2H)^(0.87732)W_(br)=2.15635(D^2H)^(0.95504)W_1=3.24511(D^2H)^(0.87984)W_(ba)=2.23432(D^2H)^(0.75703)W_r=2.39599(D^2H)^(0.82747)Wu=4.12304(D^2H)^(0.88809)W_a=4.89706(D^2H)^(0.8848).The precision of the equation is over 97%,and the net yield and the yield structure were also studied.the estimated total biomass of the Pinus radiata plantation is 19.507 t/hm^2,and the productivity is 3 902.40 kg/(hm^2·a).The arbor-layer biomass is 8.510 t/hm^2,and its' productivity is 1 702.00 kg/(hm^2·a),occupying 43.62% of the total stand.The biomass and productivity of shrub,herb,moss and litter layers are 2.171 t/hm^2?434.20 kg/(hm^2·a),8.091 t/hm^2?1 618.20 kg/(hm^2·a),0.464 t/hm^2?92.80 kg/(hm^2·a) and 0.271 t/hm^2?54.20 kg/(hm^2·a),respectively.The biomass and productivity of Pinus radiata plantations are more higher than those of Pinus tabulaeformis and Cupressus chengiana plantations.
出处
《四川林业科技》
2005年第1期21-27,共7页
Journal of Sichuan Forestry Science and Technology
基金
国家"十五"科技攻关项目(2001BA510B03)"退耕还林工程区干旱河谷造林技术研究与示范"之一部分。
关键词
辐射松人工林
生物量
生产力
Pinus radiata,plantation,Biomass,Net-production
