【摘要】 用八块不同密度林分的资料,分析了太岳山人工油松林的生物量,22年生油松林地上部现存量平均为57.5吨/公顷,24年生的平均为79.6吨/公顷。年生长量为9.8吨/公顷,净同化率平均为0.885吨/公顷/年,相对生长率平均为16.8％,生产力属于中等水平。 根据树干解析及回归估计确定的生长量,对油松林进行生长分析试验,分析的结果表明,不同密度油松林的相对生产率不同,密度在6000/公顷时,相对生长率最大,20000/公顷林分的相对生长率较小,即相对生长率因密度的增加而减少,相对生长率与叶面积比及净同化率的关系可由下式表达: RGR=3.5028NAR-0.1488 r=0.997 RGR=0.1859LAR-0.1746 r=0.989 “过密”已不利于太岳油松林现阶段的生长,从生长过程分析中可以推断,太岳山穴播的油松林在13—15年时即应进行抚育。更多还原

【Abstract】 Biomass production of pinus tabulaeformis plantations in Tai Yue MountainShanxi province was determined.Data of 8 sample plots from stands of differentdensities were collected for analysis.Current biomass production of parts aboveground was 57. 5T/ha in average,and that of 24-year plantation was 79. 6T/ha.Mean annual growth was 7.8T/ha,net assimilation 0.885T/ha/yr, and relativerate of growth was 16.8%. Productivity of the plantation is considered to beof middle level. As shown by regression,relative growth rate of stands is closely correlatedwith density of the plantation. A maximal value was found in stands withdensity of 6000 stems/ha,while that of stand with density 20,000 stems/hawas in minimum.Relation of relative growth rate to leaf area ratio and netassimilation rate can be expressed by following equations. RGR = 3. 5028NAR-0. 1488 r= 0. 997 RGR = 0. 1859LAR-D. 1746 r= 0. 989 Over density is a factor holding back the current growth of the plantation.Form growth analysis indicated that plantation should be thinned at 13-15years of age.更多还原