油松人工林地上生物量、叶面积指数与林分密度关系的研究

在内蒙古大青山区应用"平均标准木法"测定30a生油松人工林的地上生物量,并对相似立地条件下,不同林分密度的油松人工林地上生物量及其分配规律进行了研究。结果表明:1)林分密度对油松人工林平均单株生物量和单位面积林木总生物量均有显著的影响。前者随林分密度的增加而下降,且下降的幅度越来越小,可由方程y=axb来描述;后者随林分密度的增加而上升,当密度达到一定值(阳坡为3000株/hm、阴坡为4000株/hm时)生物量增长缓慢甚至不变,可由方程y=a+bln(x)来描述。2)乔木层生物量是林分总生物量的重要组成部分。阳坡乔木层所占比例为76.06%~88.20%,阴坡乔木层所占比例为83.19%~93.75%。3)叶面积指数随林分密度的增加而增加,在相同密度条件下阳坡的叶面积指数大于阴坡,且密度愈大两者相差愈大。

The Research on the Relationship Between the Ground Biomass,the Leaf Area Index and the Stand Density in Pinus tabulaeformis Artificial Forest

The ground biomass of Pinus tabulaeformis artificial forest of 30a in Daqing Mountain,Inner Mongolia was measured by the method of the average model tree.The ground biomass and the distribution regulation were studied in the different stand density in the similar stand condition.The results showed that the stand density affected both the individual biomass and the total biomass in unit area significantly.The individual biomass decreased with the increase of the stand density and varied less and less,and their relationship could be expressed by the equation y=axb.The total biomass in unit area increased with the increase of the stand density and varied less when the density increased to a value(It is 3000/ha in the southern slope and is 4000 /ha in the northern slope of mountains.),and they could be expressed by the equation y=a+bln(x).The biomass of the arborous layer was the important component parts in the total biomass in the forest.In the southern slope the proportion of the arborous layer was 76.06%～88.20%,and it was 83.19%～93.75% in the northern slope of mountains.Leaf area index increased as the stand density increased and the values in the southern slope was greater than those in the northern slope of mountains under the same density,and the greater the density was,the greater those difference between the slopes was.