密度对四季竹地上生物量分配格局及异速增长模式的制约性调节  

Restrictive regulation of stand density on aboveground biomass allocation and allometric pattern of Oligostachyum lubricum

作　　者：郭子武[1] 杨清平[1] 李迎春[1] 陈双林[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400

出　　处：《生态学杂志》2013年第3期515-521,共7页Chinese Journal of Ecology

基　　金：国家公益性行业(林业)科研专项(201004008);浙江省农业科技成果转化项目(2012T201-01);浙江省省院合作项目(2010SY01);中央级公益性科研院所基本科研业务费专项(RISF61258)资助

摘　　要：为了给四季竹(Oligostachyum lubricum)高效培育的林分结构建立提供理论依据,对立竹胸径基本一致的4种立竹密度(24600～29800株·hm-2,D1;37500～42600株·hm-2,D2;46500～52800株·hm-2,D3;76500～85500株·hm-2,D4)四季竹纯林进行了1～3a立竹地上生物量积累、分配与异速生长模式的研究。结果表明:四季竹立竹构件生物量分配比例秆>叶>枝。随着立竹年龄增大,不同密度的四季竹林立竹秆、枝、叶生物量和地上生物量及叶/枝、叶/秆、枝/秆构件生物量比总体上均呈增大趋势,且2a、3a立竹显著高于1a立竹,枝、叶生物量分配比例呈升高趋势,而秆生物量分配比例呈下降趋势。随着立竹密度增大,1～3a立竹地上生物量、构件生物量总体上呈"∧"型变化,D1～D3密度时逐渐升高,D4密度时显著下降,各年龄立竹枝、叶生物量分配比例降低,而秆生物量比例增大,叶/枝、叶/秆、枝/秆生物量比总体上1a立竹呈倒"N"型变化,2a、3a立竹呈下降趋势。叶-枝构件生物量符合近等速增长模式,异速生长指数随密度的增大而小幅度下降,叶-秆、枝-秆构件生物量符合简单异速增长模式,异速生长指数随密度的增大分别呈升高、先升高后降低的变化趋势。研究表明,当超出一定密度时(D2密度以上),四季竹立竹生物量分配更趋向于支撑构件(秆),以促进立竹纵向生长来获取更多的光资源;46500～52800株·hm-2是试验四季竹林立竹生物量高效积累和有效分配的密度。In order to provide a theoretical basis for establishing a high-productive Oligostachyum lubricurn stand, this paper studied the aboveground biomass accumulation, allocation and the al- lometric pattern of 1-3 year-old O. lubricum at four stand densities （24600-29800 stems ·hm^-2, D1; 37500-42600 stems·hm^-2, D2; 46500-52800 stems ·hm^-2, D3; and 76500- 85500 stems ·hm^-2, D4 ） with basically the same DBH. The allocation proportion of the O. lubricum modular biomass was in the order stem〉branch〉leaf. With the increasing age of the O. lubricum, the modular biomass and aboveground biomass as well as the leaf/branch, leaf/ stem, and branch/stem ratios at the four stand densities all had an increasing trend, and were significantly higher for 2- and 3-year-old O. lubricum than for 1-year-old O. lubricum. The allo- cation proportion of the branch- and leaf biomass presented an increasing trend, while that of the stem biomass was in adverse. With the increasing stand density, the modular biomass and abovegroUnd biomass of 1-3-year-old O. lubricum were overall in ＂/~ ＂ shape, i. e. , increased gradually at stand densities D1-D3 but decreased significantly at stand density D4. The allocation proportion of the leaf- and branch biomass of 1-3-year-old O. lubricum decreased, while that of the stem biomass increased. The leaf/branch, leaf/stem, and branch/stem ratios of 1-year-old 0. lubricum were in inverse ＂N＂ shape, while those of 2- and 3-year-old decreased on the whole. The leaf-branch biomass accorded with near-constant growth model, and the allometric in- dex decreased slightly with increasing stand density; whereas the leaf-stem biomass and the branch-stem biomass accorded with simple allometric model, and their allometric indices presen- ted a trend of increasing and of decreased after an initial increase with the increase of the stand density, respectively. All the results indicated that when the stand density was higher than 37500-42600 stems ·hm^-2, more biomass was tended to allocate in stem

关 键 词：四季竹 立竹密度 生物量分配 异速生长指数 

分 类 号：Q948[生物学—植物学]