土壤水分胁迫对5个种源油松光合特性的影响

doi:10.7525/j.issn.1673-5102.2009.05.006

植物研究 ›› 2009, Vol. 29 ›› Issue (5): 539-543.doi: 10.7525/j.issn.1673-5102.2009.05.006

土壤水分胁迫对5个种源油松光合特性的影响

狄晓艳;朱小琪;马建平;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:2009-09-20 发布日期:2009-09-20
通讯作者: 王孟本
基金资助:

Effects of Soil Water Stress on Photosynthetic Characteristics in Five Provenances of Chinese Pine(Pinus tabulaeformis Carr.)

DI Xiao-Yan;ZHU Xiao-Qi;MA Jian-Ping;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:2009-09-20 Published:2009-09-20
Contact: WANG Meng-Ben
Supported by:

摘要/Abstract

摘要： 在盆栽条件下，对5个种源油松（山西中条山ZT，山西吕梁山LL，山西太行山TH，陕西洛南LN和陕西黄陵HL）幼苗进行了水分胁迫处理实验，对其净光合速率（P_n）、蒸腾速率（T_r）、气孔导度（G_s）、胞间CO₂浓度（C_i）、水分利用效率（WUE）及P_n与土壤含水量（SWC）的关系进行了研究。结果表明：油松幼苗的P_n、T_r和G_s均随水分胁迫程度的增加呈先上升后下降的趋势，C_i呈先下降后上升的趋势。其中TH种源的P_n、T_r和G_s最高，LN和HL种源的较低。干旱处理的第4天（SWC为15%~25%），5个种源的P_n、T_r和G_s均达到处理期的最大值；第7天（SWC为7%~9%），它们的P_n、T_r、G_s和WUE差异均极显著（p<0.01），且大小顺序均为：ZT>TH>LL>HL>LN；处理的10天后（SWC小于5%），LL、TH、LN、HL均只表现为呼吸作用。根据P_n与SWC的二次拟合方程（R²=0.980~0.997）中P_n为0时的SWC进行了抗旱性排序，依次为：TH>ZT>LL>HL>LN。

关键词: 净光合速率, 蒸腾速率, 水分利用效率, 土壤水分含量

Abstract: Seedlings of five provenances of Chinese pine (Pinus tabulaeformis Carr.) , including Zhongtiao (ZT) Mountains, Lvliang (LL) Mountains, Taihang (TH) Mountains, Luonan (LN) county and Huangling (HL) county in Shanxi, were transplanted in pots in a greenhouse and treated with progressive soil drought. The net photosynthetic rate (P_n), transpiration rate (T_r), stomatal conductance (G_s), intercellular CO₂ concentration (C_i) and water use efficiency (WUE) of them were measured with LI-6400 Portable Photosynthesis System. The quantitative relationships between their P_n and soil water content (SWC) were analyzed. The results showed that P_n, T_r and G_s of them firstly increased, then decreased with increased soil drought. The provenance of TH had the maximum P_n, T_r and G_s, while HL and HN had lower values than others. On the 4th day of treatment (SWC was 15~25%), P_n, T_r and G_s of five provenances reached the maximum values during the period of 13 days. On the 7th day of treatment (SWC was 7~9%), significant differences were observed in P_n, T_r, G_s and WUE among these provenances (P<0.01), and an order of ZT>TH>LL>HL>LN was found in P_n, T_r, G_s and WUE. After the 10th day of treatment (SWC was under 5%), only respiration was observed for LL, TH, LN and HL. According to SWC values at P_n=0 in the quadratic equations (R²=0.980~0.997) of P_n with SWC, drought resistance was reduced with an order of TH>ZT>LL>HL>LN. There were distinctive differences among five provenances in their responses to progressive soil drought.

Key words: Net photosynthetic rate, Transpiration rate, Water use efficiency, Soil water content

中图分类号:

Q945

狄晓艳;朱小琪;马建平;池喜梅;陈建文;王孟本*. 土壤水分胁迫对5个种源油松光合特性的影响[J]. 植物研究, 2009, 29(5): 539-543.

DI Xiao-Yan;ZHU Xiao-Qi;MA Jian-Ping;CHI Xi-Mei;CHEN Jian-Wen;WANG Meng-Ben*. Effects of Soil Water Stress on Photosynthetic Characteristics in Five Provenances of Chinese Pine(Pinus tabulaeformis Carr.)[J]. Bulletin of Botanical Research, 2009, 29(5): 539-543.

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土壤水分胁迫对5个种源油松光合特性的影响

Effects of Soil Water Stress on Photosynthetic Characteristics in Five Provenances of Chinese Pine(Pinus tabulaeformis Carr.)

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