截顶后红松幼树光合生理响应研究  

Response of Photosynthetic Physiology to Top Pruning of Young Pinus Koraiensis

作　　者：Nguyen Thanh Tuan 沈海龙[1] 王琴香[1] 张鹏[1] Vu Dinh Duy 

机构地区：[1]东北林业大学林学院,哈尔滨150040 [2]越南林业大学第二分校林学系,越南同奈810000 [3]越南技术与科学院自然博物馆,越南河内100803

出　　处：《森林工程》2017年第4期1-7,共7页Forest Engineering

基　　金：中央高校基本科研业务费专项资金(2572016AA39);林业公益性行业科研专项(201204320)

摘　　要：以14年生红松人工林为研究对象,研究不同截顶处理(CK:不截顶、P1:截去第2轮枝及以上部分、P2:截去第3轮枝及以上部分)对树木光合生理特征的影响。结果表明:截去第3轮枝后在短时间内(2个月)对红松树体光合特征各指标有显著提高作用,但是效应随着时间增加而减少,2个月后影响就不再显著;截顶后不同叶龄针叶的光合生理响应也有所不同:对于当年生针叶,两种截顶处理对净光合速率、气孔导度、胞间CO2浓度的影响不显著,但两种截顶对蒸腾速率影响显著,并且P2处理显著提高了蒸腾速率;对于一年生针叶,两种处理中P1处理只显著提高了净光合速率,P2处理对所有光合指标都没有产生显著影响;对于二年生针叶,P2处理显著增加了针叶的各光合特征指标(净光合速率、气孔导度、蒸腾速率和胞间CO2浓度),而P1处理对所有光合指标的影响都不显著;截去第3轮枝的红松一年生、二年生针叶叶绿素a、叶绿素b、总叶绿素及类胡萝卜素含量显著高于未截顶红松。本试验揭示了截去第3轮枝及以上部分可以增加红松叶片光合作用,可为进一步探究截顶后树木的复壮机制以及改善经营水平提供依据。The effect of different top pruning methods（ GK ： no toppruning , PI：cutting down the last two layers of branches , P2 ： cutting down the last three layers of branches） on photosynthetic physiology in 14 - year - old Pinus koreaiensis trees w a s deter-mined in this study. The result indicated that the P2 treatment significantly raised the photosynthetic physiology parameters during the first 2 months after treatment, and then such effect declined over time and eventually disappeared two months later. The photosynthetic physiological response of different age needles to top pruning had certain variation ： no marked promotion effect of pruning on netphoto -synthetic rate, stomatal conductance and intercellular carbon dioxide concentration was detected in current year needles, except for transpiration, which was the highest in P2 treatment ; P I t reatment had obvious promotion effect on net photosynthetic rate in 1 - y e a r -old needles while photosynthetic parameters were not significantly affected by P2 treatment. In 2 - year - old needles, P2 showed greater effect than PI in improving photosynthetic parameters （net photosynthetic rate, stomatal conductance, transpiration, and inter-cellular carbon dioxide concentration）. In both one and two year - old needles, P2 treatment caused greater chlorophyll a, chloro-phyll b, the total chlorophyll, and carotenoids than GK. This study revealed that the photosynthetic performance can be markedly im-proved by cutting down the last three layers of branches and provided a theoretical basis for further studies of rejuvenation mechanisms in the top pruning treatment to improve management quality.

关 键 词：红松(Pinuskoraiensis) 截顶 光合特征 色素含量 

分 类 号：S792[农业科学—林木遗传育种]