Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Physiological characteristics of Pinus taiwanensis

HONG Shu-yuan,WU Ze-min,LIU Xi-jun(School of Forestry and Landscape Architecture,Anhui Agricultural University,Hefei 230036)  
The photosynthetic rate of needles of Pinus taiwanensis was measured in sunny days at different seasons by using Li-6400 photosynthetic system(the trees were selected in a natural community at 1 400 m above sea level) in Huangshan mountains.The effects of physiological factors(stomatal conduction,CO_2 concentration in cell clearance) and ecological factors(photosynthetic active radiance,air temperature,relative humidity,etc.) were determined as well.The results are as follows:The light compensation point and saturation point of needles in Pinus taiwanensis are 110 μmol·m~(-2)·s~(-1) and 1 099 μmol·m~(-2)·s~(-1),respectively,and the apparent quantum yields is 0.017,indicating this tree is a typical intolerant species.The photosynthetic rates have obvious diurnal changes;their curves are double-peaked in spring and summer,and have photosynthetic depression at midday.Regression analysis showed that factors affecting photosynthetic diurnal changes were CO_2 concentration in cell clearance(Ci) and stomatal conduction(Cond),followed by photosynthetic active radiance,relative humidity et al.For example,the Multivariable regulation for one-year needle in spring season could be written as Y=4.70+21.62X_(cond)-0.02X_(ci)+0.05X_(RH)-0.0004X_(PAR).
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved