摘要
以欧美107杨为研究对象,从树干液流、蒸腾速率(Tr)以及叶水势(LWP)等杨树水分生理指标角度,探讨修枝处理对这些生理指标在生长季(6—9月)内的影响及其变化规律,并做相应的分析和讨论。试验地Ⅰ以4年生107杨为样木,试验地Ⅱ以6年生107杨为样木。试验地Ⅰ,Ⅱ均设计3个处理组,每个处理组设有3种处理,即对照处理CK(不修枝)、中度处理P1(修掉树冠高度的1/3)、重度修枝P2(修掉树冠高度的2/3)。研究结果表明:1)发生旱情季节(6—8月),液流通量及液流速率呈现P1>CK>P2的规律;正常月份(9月),液流通量及液流速率呈现出CK>P1>P2的规律;P1的液流通量及速率在旱季或正常月份大小基本相同。这表明同正常月份未修枝CK相比,适当修枝(P1)使杨树树干液流始终保持在一定的较低水平,抗旱能力得到一定程度的提高。2)整个生长季内,蒸腾速率(Tr)和叶水势(LWP)都呈现出CK<P1<P2的规律,表明修枝后杨树的单叶水分生理能力得到显著提高。
With poplar clone （Populus × euramericana cv.‘74 /76’） as the research object,this paper investigated the variation of stem sap flow,transpiration rate （Tr） and leaf water potential （LWP） during the growing season （June to September）.The experiment set two experimental sites：one was 4-year-old poplar clone,and the other was 6-year-old.There were 3 treatment levels in each site： the CK （unpruned）,Pl （1 /3 crown was pruned） and P2 （2 /3 crown was pruned）.The results showed： 1） The flux and velocity were P1 CK P2 during dry season（June to August）.But,in wet season of September,the flux and velocity were CK P1 P2.The Flux and velocity of P1 were almost same between drought or wet months,which indicated that the stem sap flow of poplar was maintained at a certain low level by proper pruning and the capability of counteracting drought observably was increased after the pruning.2） The order of transpiration rate（Tr） and leaf water potential（LWP） was CK P1 P2,which suggested that the physiological capability of individual leaf in maintaining water balance was observably improved by pruning.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2011年第3期33-38,共6页
Scientia Silvae Sinicae
基金
国家林业公益性行业科研专项经费重大项目"杨树产业资源材培育及新产品开发关键技术研究"(201004004)
农业部科技成果转化项目(05EFN21710043)
国家"十一五"科技支撑计划(2006BAD03A01)
关键词
修枝
树干液流
蒸腾速率
叶水势
pruning
stem sap flow
transpiration rate
leaf water potential
