摘要
为探讨三倍体毛白杨叶片水分特征及其与蒸腾作用的相互关系,利用二氧化碳变量法、烘干法、压力平衡法等对三倍体毛白杨速生林叶片蒸腾速率、含水量、水势、水容等水分特征进行了连续2年的动态观测。结果表明,三倍体毛白叶片蒸腾速率(Tr)呈"单峰型"日变化,与之相反,其叶片绝对含水量(CLAW)、相对含水量(CLRW)、水势(Ψ)、水容(C)等呈"V"型。Tr与CLAW、CLRW、Ψ、C等具有一定的相关性,但不同时段其相关性及相关程度不同。由于树体水容充、放水特性,CLAW、CLRW、Ψ、C与Tr存在不同程度的滞后效应,与环境因素共同调节和影响树木蒸腾。
To clarify the characteristics and relationships of leaf absoluteness water content（RAWC）,relative water content（RRWC）,water potential（ψ） and water capacitance（C） and its impacts on transpiration rate（Tr） of Triploid clones Populus tomentosa,the dynamic observations of 2 consecutive years on Tr,RAWC,RRWC,ψ,and C were carried out by using Licor-6400 portable photosynthesis system,oven drying method,portable pressure chamber,and so on. The results show that the diurnal variations of Triploid clones P. tomentosa Tr was a single-peaked curve,but a ＂V-shape＂ curve for RAWC,RRWC,ψ,and C; there was a correlation between Tr and RAWC,RRWC,ψ,C,but the correlation coefficients was different at different time; there exists fifferent lag effects between Tr and RAWC,RRWC,ψ,C,which regulated and affected the tree transpiration together with the environmental factors.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2014年第8期9-14,共6页
Journal of Central South University of Forestry & Technology
基金
国家林业公益性行业科研专项经费重大项目(201004004)
北京林业大学"985"优势学科创新平台开放基金(000-1108003)
关键词
三倍体毛白杨
蒸腾
水势
水容
Triploid clones Populus tomentosa
leaf water features
leaf transpiration
water potential
water capacitance
