Welcome to visit Scientia Silvae Sinicae，Today is

Scientia Silvae Sinicae ›› 2011, Vol. 47 ›› Issue (3): 33-38.doi: 10.11707/j.1001-7488.20110306

Previous Articles     Next Articles

Effects of Pruning on Water Physiology of Poplar Clone Populus×euramericana cv.'74/76’

Qi Yufei1, Yin Weilun1,2, Xia Xinli1, Sun Shangwei   

  1. 1. College of Biological Sciences and Biotechnology,Beijing Forestry University Beijing 100083;2. Key Laboratory for Silviculture and Conservation,Ministry of Education Beijing Forestry University Beijing 100083; 3. Chinese Academy of Forestry Beijing 100091
  • Received:2010-01-23 Revised:2010-06-24 Online:2011-03-25 Published:2011-03-25

PDF (PC)

767

Abstract:

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.

Key words: pruning, stem sap flow, transpiration rate, leaf water potential

CLC Number: