[1]LIU Yong-hong,DUAN Yu-xi,BAI Yu-ying.Study on Suitable Soil Moisture Condition for Pinus tabulaeformis on the Sunny Slope in Southern Foothill of Daqing Mountains[J].Research of Soil and Water Conservation,2013,20(05):69-72,76.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
20
Number of periods:
2013 05
Page number:
69-72,76
Column:
Public date:
2013-10-28
- Title:
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Study on Suitable Soil Moisture Condition for Pinus tabulaeformis on the Sunny Slope in Southern Foothill of Daqing Mountains
- Author(s):
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LIU Yong-hong1,2, DUAN Yu-xi2, BAI Yu-ying2
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1. College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;
2. Inner Mongolia Academy of Forestry Science, Hohhot 010010, China
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- Keywords:
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net photosynthetic rate; transpiration rate; water use efficiency; suitable soil water content
- CLC:
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S152.7
- DOI:
-
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- Abstract:
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A Li-6400 portable photosynthesis system was used to measure a few of photosynthetic physiology parameters of Pinus tabulaeformis growing under different soil water contents (SWC) on the sunny slope in southern foothill of Daqing Mountains. In order to determine the range of suitable SWC of the tree species growth, the response processes of net photosynthesis rate (Pn), carboxylation efficiency (Ce), transpiration rate (Tr), water use efficiency (WUE) to different SWC were studied, and the rule of its photosynthesis under different SWC was explored. The results show that the soil water contents keeping optimum Pn and WUE, as well as Ce of Pinus tabulaeformis are 17.9% and 14.66%, as well as 16.43%, respectively; that soil water compensation point for hydration of the tree species is 3.74%, and the SWC causing the maximum Tr of that is 18.7%. In the light of site condition of the sunny slope, the SWC maintaining the best WUE of leaf and the SWC corresponding with the Pn which is equivalent to 70% of the best Pn can be chosen as the upper limit and the lower limit for the rang of suitable SWC. The general index can be quantified as 10.85%~14.66%.