Photosynthetical and ecophysiological characteristics of Illicium lanceolatum seedlings for different provenances

摘要

The photosynthetic ecophysiological characters of 4 different Ulicium lanceolatum provenances in three different growth seasons were measured. The results showed that significant differences of photosynthesis were existed among provenances and their growth seasons. 1) In the early growth period, the decreasing order of the mean daily net photosynthetic rate (P_n) of 4 provenances were Lin'an (LA), Nan'ping (NP), Kai'hua (KH), and Wu'ning (WN) provenance and the order of mean daily transpiration rate (T_r) were LA, KH, NP and WN. In the prosperous growth period, the mean daily P_n ranked as in the decreasing order of WN, KH, LA and NP, and that of mean daily T_r were WN, KH, NP and LA. In the late growth period, the decreasing order of mean daily P_n were LA, KH, WN and NP. 2) I.lanceolatum had the obvious seasonal difference in the average value of P_n and Tr and that was ranked in decreasing order as flourishing growth period>early growth period >late growth period. 3) The path coefficient analysis indicated that the decreasing orders of important factors which affected P_n were temperature of leaf (T_(leaf)), internal CO_2 concentration (C_i), difference of saturation of water vapor (V_(pdl)), T_r, stomatal conductance (C_(ond)), temperature of air (T_(air))and air CO_2 concentration of (C_a).