杂种落叶松冠层光合速率日变化及产量分配  

Diurnal Variation of Canopy Photosynthetic Rate and Yield Distribution of Hybrid Larch Plantation

作　　者：李想[1] 孙一博 孙赫 王鹤智 LI Xiang;SUN Yi-bo;SUN He;WANG He-zhi(Jilin Forestry Investigation and Planning Institute,Changchun 130022;World Bank Loan Project Management Center,National Forestry and Grass Administration,Beijing 100714;Academy of Forest Inventory and Planning,National Forestry and Grass Administration,Beijing 100714)

机构地区：[1]吉林省林业调查规划院,长春130022 [2]国家林业和草原局世界银行贷款项目管理中心,北京100714 [3]国家林业和草原局调查规划设计院,北京100714

出　　处：《温带林业研究》2021年第1期45-51,共7页Journal of Temperate Forestry Research

摘　　要：【目的】基于2011年在黑龙江省牡丹江市江山娇林场测定的杂种落叶松光合作用及其生物量数据,构建了枝条生物量预估模型。【方法】描述各轮枝条光合速率的基本规律,并通过分析光合产量与枝条生长量的关系,进一步探讨杂种落叶松冠层光合产量的分配规律。【结果】以基径为自变量的落叶松枝条生物量预估模型模拟效果最好,模型的拟合精度达到94.9%;落叶松上层树冠的光合速率明显高于下层,中层(4、5层)轮枝对树干生长的贡献率最大;光合速率的日进程中,高峰期普遍分布在每天的11:00—14:00,但上层树冠在此期间会出现“午休”现象;人工杂种落叶松功能性冠占总冠长的72%。【结论】下层两轮活枝不仅对树干生长没有贡献,还会消耗一部分能量,在修枝时建议提前修剪掉。【Objective】Based on the data of photosynthesis and biomass for Hybrid larch from Jiangshanjiao Forest Farm,Mudanjiang city of Heilongjiang Province in 2011,the biomass forecast model of branch was established and the regular of photosynthetic rate for every layer’s branch was described.【Method】Meanwhile the analysis of the relationship between the photosynthetic yield and the growth of branches,the distribution law of the canopy photosynthetic yield of hybrid larch was further discussed.【Result】The results showed that the biomass forecast model which with diameter as the independent variable has the best fitting effect and the precision of the model comes to 94.9%;the photosynthetic rate of upper crown was higher than the lower crown,the middle crown(4th and 5th layer)branches have the most contribution to the tree trunk;the peak time of photosynthetic rate was from 11:00 to 14:00,but during this time the upper crown has“midday depression”phenomenon;The functional crown of Hybrid larch was account for 72%of the whole crown.【Conclusion】The lower two whorls of live branches not only have no contribution to the growth of the trunk,but also consume part of the energy.It is recommended to prune them in advance when pruning.

关 键 词：枝条生物量 午休 贡献量 

分 类 号：S757.1[农业科学—森林经理学]