不同密度下大叶相思幼林的生长和生物量分配格局  

Growth of Young Acacia auriculiformis Stands under Different Densities and their Biomass Allocation

作　　者：黄丽铭[1] 薛立[1] 王相娥[1] 谢腾芳[1] 任向荣[1] 曹鹤[1] 

机构地区：[1]华南农业大学林学院,广东广州510642

出　　处：《华南农业大学学报》2008年第3期52-55,共4页Journal of South China Agricultural University

基　　金：广东省林业局资助项目(4400-02084)

摘　　要：对密度为1 667、4 444和10 000株.hm-2的2年生大叶相思Acacia auriculiformis幼林的胸径、树高、冠幅生长进行了研究,并采伐标准木,用标准木的各器官干质量与胸径和树高的关系建立数学模型,估测林分的生物量和平均木干质量.结果表明:密度为1 667、4 444和10 000株.hm-2林分的平均胸径分别为3.35、3.31和3.88 cm,平均树高分别为4.26、4.02、4.10 m,平均冠幅分别为2.11、1.73、1.26 m.密度为4 444和10 000株.hm-2林分的平均单株干质量相近,显著小于1 667株.hm-2林分的平均单株干质量(P<0.000 1);林分生物量则为10 000株.hm-2林分(27 600 kg.hm-2)>4 444株.hm-2林分(12 266 kg.hm-2)>1 667株.hm-2林分(6 701kg.hm-2).各器官生物量所占比率在密度为10 000和4 444株.hm-2的林分内为干>根>枝>叶>皮,在密度1 667株.hm-2的林分内为干>根>叶>枝>皮.Diameter at breast height, tree height and crown width of three 2-year-old Acacia auriculiformis stands with 1 667, 4 444 and 10 000 trees ·hm^-2, respectively, were measured; sample trees were cut and stand biomass and mean tree mass were estimated using mathematical models established by their organ dry mass and diameter at breast height and tree height relationships. Mean diameter at breast height of 1 667, 4 444 and 10 000 trees ·hm^-2 stands were 3.88, 3.31 and 3.35 cm, respectively, and their mean tree heights were 4.26, 4. 02 and 4. 10 m, respectively, whereas their mean crown width were 2. 11, 1.73 and 1.26 m, respectively. The mean dry mass of 4 444 trees ·hm^-2 stand was close to that of 10 000 trees ·hm^-2 stand, which was significantly lower than that of 1 667 trees ·hm^-2 stand（ P 〈 0. 000 1 ）. The order of stand biomass was 10 000 trees ·hm^-2 stand （27 600 kg ·hm^-2） 〉 4 444 trees ·hm^-2 stand（12 266 kg ·hm^-2） 〉 1 667 trees ·hm^-2 stand（6 701 kg ·hm^-2）. The proportion in different tree organs of 10 000 and 4 A AA trees ·hm^-2 stands was in the order of stem 〉 root 〉 branch 〉 leaf 〉 bark, while the order of 1 667 trees ·hm^-2 stand was stem 〉 root 〉 leaf 〉 branch 〉 bark.

关 键 词：密度 大叶相思 生长 生物量 

分 类 号：Q948[生物学—植物学]