摘要
为探究分级指标差异对云南松苗木生物量分配的影响,采用平均值±标准差法将苗木划分为3个不同的等级,对不同等级苗木生物量分配特征进行研究。结果表明:以地径或苗高分级,云南松苗木生物量分配在3个等级间均存在显著差异(P<0.05),单株生物量积累量表现为Ⅰ>Ⅱ>Ⅲ;不同生长等级云南松苗木各器官生物量的分配均表现为叶生物量>茎生物量>根生物量;各等级苗木根生物量分配比差异不显著(P>0.05),但Ⅰ级苗木分配更多的生物量给茎,Ⅲ级苗木分配更多的生物量给叶。构建各等级苗木单株生物量估测模型,以地径分级后构建的最优生物量模型多为幂函数方程,二次方程次之;以苗高分级后构建的最优生物量模型均为二次方程,回归关系均达到极显著水平(P<0.01)。因此,云南松生物量分配受到苗木等级的制约,以地径或苗高分级苗木生物量分配的差异较小,生产实践中采用地径或苗高分级均可行。
In order to reveal the effect of classification index difference on biomass allocation,the biomass in different classes was studied after the Pinus yunnanensis seedlings were divided into 3 different classes by means of plus or minus standard deviations.The results showed that the biomass allocation of P.yunnanensis seedlings exist significant differences among 3 different classes(P<0.05)grading by ground diameter or height,and biomass of individual plant was characterized by:Ⅰ>Ⅱ>Ⅲ.The biomass allocation of each organ of seedling was ordered by leaf>stem>root.There was no significant difference in root biomass allocation ratio(P>0.05),but classⅠseedlings allocated more biomass to stems,and classⅢseedlings allocated more biomass to leaves.The biomass estimation model of each seedling was constructed,the optimal biomass models for different classes of P.yunnanensis seedlings were mostly power function,followed by quadratic equations after grading by ground diameter.But grading by height were all quadratic equations,and the regression relationship reached an extremely significant level(P<0.01).In conclusion,the biomass allocation of P.yunnanensis seedlings was restricted by seedling class,grading by ground diameter or height had little effect on biomass.Therefore,it is feasible to adopt ground diameter or height grading in production practice.
作者
李亚麒
陈诗
孙继伟
王军民
许玉兰
蔡年辉
Li Yaqi;Chen Shi;Sun Jiwei;Wang Junmin;Xu Yulan;Cai Nianhui(Key Laboratory of Ministry of Education on Forest Resources Conservation and Utilization in the Southwest Mountains of China,Southwest Forestry University,Kunming Yunnan 650233,China;Key Laboratory for Forest Genetic Improvement&Propagation in Universities of Yunnan Province,Southwest Forestry University,Kunming Yunnan 650233,China)
出处
《西南林业大学学报（自然科学）》
CAS
北大核心
2020年第5期25-31,共7页
Journal of Southwest Forestry University：Natural Sciences
基金
国家自然科学基金项目(31860203,31760204)资助。
关键词
云南松
苗木分级
分级指标
生物量
Pinus yunnanensis
seedling classification
classification index
biomass
