摘要
研究了水杉人工林的树冠结构和林分生物生产力．结果表明，不同密度及林龄的林分树冠结构存在较大差异．随着树冠部位上升和林分密度增大，分枝角度逐渐减小；径阶大小与枝叶率成反比，与树冠重量成正比，径阶增大，树冠最大叶量层的位置上移，有效光合面积相对减少．树冠结构的变化直接影响到林分的生物量生产、分配比例和经济生物量．林分干、枝、叶的干物质累积趋势可用Ｒｉｃｈａｒｄ方程描述；林龄增大，分配到主干的生物量比例逐渐增加，分配到枝叶的比例逐渐减少；１５年生时，作建筑材的经济生物量是６２５＞２５００＞１２５０株·ｈａ（－１）的林分，作造纸材的经济生物量为２５００＞６２５＞１２５０株·ｈａ（－１）的林分．
The crown structure, biomass production and dry matter distribution of M. glyptostroboides plantations are studied. The results show that there exists a great difference in crown structure for plantations of various stand density and age. The branch angle is gradually decreased with the rising of crown location and increasing of stand density. The location of largest crown layer and the photosynthesis center of the crown gradually rise with the increasing of DBH. DBH bears close relationship with the crown weight and ratio of branch and leaf. However, DBH is in directly proportion to the crown weight and inversely proportional to the ratio of branch and leaf. The biomass production, distribution pattern of dry matter and economic biomass in the plantations are greatly affected by stand age and planting density. The accumulation trend of aboveground biomass, stem,branch and leaf in the plantations could be described by the use of Richards model. With the stand age increasing, the ratio of distributing the dry matter to the stem increases,but decreases to the branch and leaf. The economic biomass production for architectural timber is in order of 625>2500>1250 plant· ha(-1), and for pulp--making timber is in order of 2500>625>1250 plant· ha￣(-1) at 15 years.
出处
《应用生态学报》
CAS
CSCD
1995年第3期225-230,共6页
Chinese Journal of Applied Ecology
基金
国家自然科学基金
关键词
水杉
人工林
树冠结构
生物生产力
Metasequoia glyptostroboides, Crown structure, Biomass production, distribution pattern, Economic biomass.
