林业科学2017，Vol.53Issue(10)：29-39,11.DOI:10.11707/j.1001-7488.20171004
中国沙棘克隆生长对造林密度的早期响应及其生物量分配调节机制
Clonal growth of Hippophae Rhamniodes ssp. sinensis at the Early Stage in Response to Initial Planting Density and Its Regulation Mechanism of Biomass Allocation
摘要
Abstract
[Objective]The population stability of Hippophae rhamniodes ssp. sinensis depends on clonal growth ability and also on levels of environmental resources. However,the effects of the planting density are not well illustrated. This study aims to determine the optimal planting density according to the clonal growth response to the planting density and the regulation mechanism of the biomass allocation. [Method]Four planting densities,namely 2500,4444,10000,and 40000 plants·hm - 2 were applied. The ramet growth ability was measured for each tally tree. The clonal propagation ability was obtained by counting the daughter ramets. The clonal expansion capability was quantified by tracking the clones. Aboveground biomass was estimated from the average standard trees. The vertical and horizontal root biomasses were determined by weighting all the roots in the grid quadrats and tracked,respectively. [Result] The basal stem diameter and crown growth of the ramets showed logarithmic decreases with increasing planting density,while the height growth was independent of the density. The clonal propagation and expansion abilities showed parabola profiles,with synergistic effect between them. The biomass was allocated more to the belowground and less to the aboveground. The biomass allocation of horizontal roots showed a parabola. The growth ability of the ramets was positively correlated with the aboveground biomass allocation,and the clonal propagation and expansion abilities were positively correlated with the biomass allocation of the horizontal roots. [Conclusion]The population is traded-off in the biomass allocation between the above-and the below-ground and between the vertical and horizontal roots,and between ramet growth and the clonal propagation and expansion,by which forms individual shape and clonal growth configuration to adapt planting dnesity. With the increase of initial planting density,the ramet morphology changes from thick to medium and to slender,and the clonal propagation and expansion abilities did as a low-high-low pattern. That is to say,the clonal growth configuration went as a guerrilla-aggregation-guerrilla pattern,and the population stability exhibit a low-high-low changing process. According to this study,the suitable initial planting density is about 15000 to 20000 plants·hm - 2 ,which is most conducive to the clonal growth and the population stability maintenance.关键词
克隆繁殖/克隆扩散/生物量分配/造林密度/中国沙棘/毛乌素沙地Key words
clonal propagation/clonal expansion/biomass allocation/initial planting density/Hippophae rhamniodes ssp. sinensis/Mu Us sandy land分类
农业科技引用本文复制引用
姜准,刘丹一,陈贝贝,高海银,刘春红,张增悦,邹旭,李根前..中国沙棘克隆生长对造林密度的早期响应及其生物量分配调节机制[J].林业科学,2017,53(10):29-39,11.基金项目
国家自然科学基金项目(30371193、31070551、31570609) （30371193、31070551、31570609）
云南省林学一流学科及林学一级学科博士点建设项目(51600625) . （51600625）
