Effects of Pruning on Water Physiology of Poplar Clone Potulus × euramericana cv. ‘ 74/76’
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), P1( 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.
pruningstem sap flowtranspiration rateleaf water potential
国家科技期刊平台
NSTL
万方数据
维普
