5个油松种源光合特性的比较研究

doi:10.7525/j.issn.1673-5102.2012.02.007

植物研究 ›› 2012, Vol. 32 ›› Issue (2): 165-170.doi: 10.7525/j.issn.1673-5102.2012.02.007

5个油松种源光合特性的比较研究

狄晓艳;池喜梅;陈建文;王孟本^*

山西大学黄土高原研究所，太原　030006

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2012-03-20 发布日期:2012-03-20
通讯作者: 王孟本
基金资助:

Comparison of Photosynthesis Characteristics in Five Provenances of Chinese Pine(Pinus tabulaeformis Carr.)

DI Xiao-Yan;CHI Xi-Mei;CHEN Jian-Wen;WANG Meng-Ben*

Institute of Loess Plateau,Shanxi University,Taiyuan　030006

Received:1900-01-01 Revised:1900-01-01 Online:2012-03-20 Published:2012-03-20
Contact: WANG Meng-Ben
Supported by:

摘要/Abstract

摘要： 为了揭示自然条件下不同种源油松光合特性的差异，为优良种源选择提供依据，在黄土高原种源实验地，对5个油松种源（陕西洛南LN，陕西黄陵HL，山西吕梁山LL，山西灵空山LK，辽宁千山QM）幼苗的光合生理特征及其与环境因子的关系进行了研究。结果表明：5个油松种源的净光合速率（P_n）呈双峰型，蒸腾速率（T_r）、气孔导度（G_s）亦基本呈双峰型，第1峰值均出现在上午8:00，有明显的光合午休现象。种源QM的水分利用效率（WUE）日变化呈单峰性，峰值出现在10:00，而种源LN、LL、LK和HL呈双峰型，第一峰值出现在8:00，第二峰值出现在12:00~16:00。种源LN、LL、LK和QM午间净光合速率的下降主要由气孔因素引起的，而种源HL则主要由叶肉细胞同化能力的降低引起的。种源LK的日均P_n、T_r和WUE均高于其他种源，是高光合、高蒸腾和高水分利用效率的种源，而种源HL属于低光合、低蒸腾和低水分利用效率的种源。T_a是影响各种源的P_n的首要因子，其次是VPD；RH是影响种源LN、LL和LK的T_r的首要因子；而T_a和VPD是影响种源HL和QM的T_r的主要因子。

关键词: 净光合速率, 蒸腾速率, 水分利用效率, 油松种源

Abstract: In order to reveal the photosynthetic characteristic variations of different provenances and provide the theoretical basis for the work of provenance selection, the seedlings of Chinese pine (Pinus tabulaeformis Carr.) from five provenances, including provenances Luonan (LN) and Huangling (HL) from Shaanxi, Lvliang Mountain (LL) and Lingkong Mountain (LK) from Shanxi and Qian Mountain (QM) from Liaoning were planted in Loess Plateau. The photosynthetic parameters and their correlations to environmental factors were studied with Li-6400 portable photosynthesis system under natural condition in order to reveal the mechanism of adaptation of different provenances. The results indicted that the diurnal dynamics of net photosynthetic rate (P_n), transpiration rate (T_r) and stomatal conductance(G_s) for five provenances were double-peak curves with obviously midday depression in P_n. The water use efficiency (WUE) of porvenance QM had only one peak, while those of provenances LN, LL, LK and HL had two peaks. The first peaks for all provenances occurred at 8:00 or 10:00, and the second peaks of provenances LN, LL, LK and HL occurred between 12:00 and 16:00. Based on the tendency of changes in P_n, G_s, intercellular CO₂ concentration (C_i) and stomatal limitation (L_s), we speculate that the midday depressions of provenance HL was not controlled by stomatal factors, while those of the other four provenances were. The daily mean values of P_n, T_r and WUE for provenance LK was the highest and those for provenance HL was lower than the other provenances. The correlation analyses showed that the main factors affecting P_n were air temperature (T_a) and vapour pressure deficit (VPD). The main factor affecting T_r was relative humidity (RH) for provenances LN, LL and LK, while for provenances HL and QM, the main factors were T_a and VPD.

Key words: net photosynthetic rate, transpiration rate, water use efficiency, provenance of Pinus tabuleformis

中图分类号:

S791.254

狄晓艳;池喜梅;陈建文;王孟本*. 5个油松种源光合特性的比较研究[J]. 植物研究, 2012, 32(2): 165-170.

DI Xiao-Yan;CHI Xi-Mei;CHEN Jian-Wen;WANG Meng-Ben*. Comparison of Photosynthesis Characteristics in Five Provenances of Chinese Pine(Pinus tabulaeformis Carr.)[J]. Bulletin of Botanical Research, 2012, 32(2): 165-170.

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5个油松种源光合特性的比较研究

Comparison of Photosynthesis Characteristics in Five Provenances of Chinese Pine(Pinus tabulaeformis Carr.)

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