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干旱胁迫对红皮柳光合特性日变化及生长的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2016年06期
Page:
41-46
Column:
研究论文
publishdate:
2016-11-30

Article Info:/Info

Title:
Effect of drought stress on photosynthetic diurnal course and growth of Salix purpurea
Article ID:
1000-2006(2016)06-0041-06
Author(s):
JI Huijuan1 JIA Huixia12 ZHANG Xiaoling1 HU Jianjun12*
1. State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China;
2. Co-Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210073, China
Keywords:
Salix purpurea drought stress photosynthetic characteristics diurnal course growth
Classification number :
S727.2
DOI:
10.3969/j.issn.1000-2006.2016.06.007
Document Code:
A
Abstract:
Salix purpurea, a native tree species in the northwestern China, grows fast and has strong adaptability. It plays important roles in water and soil conservation, shelter forest and bioenergy. In order to illustrate the photosynthetic mechanism and growth response of S. purpurea to soil drought stress, we studied the diurnal photosynthetic characteristics of the potted cutting plants under four different soil drougth stress(control, mild, moderate and severe drought stress). The results showed that the diurnal means of the net photosynthetic rates(Pn)reduced by 10.4%(P>0.05), 17.9%(P<0.05)and 58.2%(P<0.05)under the mild, moderate and severe drought stress compared with control, respectively. And the Pn under moderate and severe drought stress reduced significantly. With the drought stress level increasing, the daily average of the net photosynthetic rates(Pn), transpiration rates(Tr), stomatal conductance(Gs)also decreased significantly, while water utilization efficiency(EWUE)increased slightly. Unlike the above parameters, the intercellular CO2 concentration(Ci)decreased initially and then increased. These results suggested that the decrease of Pn under mild and moderate drought stress might be caused by stomatal limitation, while the decrease under severe drought stress might be caused by stomatal and non-stomatal limitation. Furthermore, the relative growth ratio of height and ground diameter of S. purpurea cutting plants decreased significantly with the increased drought stress level.

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Last Update: 2016-11-20