干旱胁迫对两种沙地灌木能源树种光合特性的影响

孙龙; 彭祚登; 王冲; 杨腾

doi:10.3969/j.issn.1000-2006.2014.02.019

孙龙,彭祚登,王冲,杨腾

南京林业大学学报（自然科学版） ›› 2014, Vol. 38 ›› Issue (02) : 99-104.

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南京林业大学学报（自然科学版） ›› 2014, Vol. 38 ›› Issue (02) : 99-104. DOI: 10.3969/j.issn.1000-2006.2014.02.019

研究论文

干旱胁迫对两种沙地灌木能源树种光合特性的影响

孙龙,彭祚登^*,王冲,杨腾

作者信息 +

Effect of drought stress on photosynthetic characteristics of two energy resource sandy shrubs

SUN Long, PENG Zuodeng^*,WANG Chong,YANG Teng

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文章历史 +

摘要

为了研究干旱胁迫对两种灌木能源树种光合特性的影响,选择沙枣(Elaeagnus angustifolia L.)1年生实生苗和多花柽柳(Tamarix hohenackeri Bunge)1年生扦插苗为试验材料,通过4个不同土壤水分条件下的盆栽试验,测定叶片叶绿素含量和光合参数。结果表明:多花柽柳在各个土壤水分条件下叶片叶绿素含量均低于沙枣,多花柽柳在中度干旱胁迫条件下叶绿素含量增加,沙枣在重度干旱胁迫条件下叶绿素仍然有较高含量。随着干旱胁迫程度加重,2个树种净光合速率、蒸腾速率和气孔导度均呈下降的趋势,在中度干旱条件下净光合速率和蒸腾速率下降更明显,但胞间CO₂浓度呈上升趋势。多花柽柳净光合速率和蒸腾速率日变化均呈现出“双峰”曲线,11:00时出现“光合午休”现象,气孔导度呈现“单峰”曲线; 沙枣净光合速率日变化呈“单峰”曲线,上午明显高于下午。两树种蒸腾速率日变化和气孔导度日变化均表现为“双峰”曲线,呈现正相关性。

Abstract

In order to study the effects of drought stress on photosynthetic characteristics of two energy resource shrubs, one-year-old Elaeagnus angustifolia L. seedlings and Tamarix hohenackeri Bunge cutting seedlings were selected as the experimental materials. Their leaf chlorophyll content and photosynthetic parameters under four different soil water conditions were measured in the water-controlling pot experiments. The results showed that the leaf chlorophyll content of T. hohenackeri was lower than E. angustifolia at various soil moisture conditions, leaf chlorophyll content of T. hohenackeri increased under moderate drought stress and there was still a higher content of E. angustifolia in severe drought stress conditions. With the aggravation of drought stress, the net photosynthesis rate(Pn), transpiration rate(Tr)and stomatal conductance(Gs)of both two tree species showed a tendency of decrease, and under moderate drought stress, Pn and Tr decreased more significantly, while the intercellular CO₂ concentration(Ci)increased. The diurnal variation curves of both Pn and Tr of T. hohenackeri displayed the two-peak pattern with a typical midday depression at 11:00 under different levels of drought stress, while Gs presented a single-peak curve. The diurnal variation of Pn of E. angustifolia displayed a single-peak curve, which was significantly higher in the morning than in the afternoon. Tr and Gs of two shrubs were displayed in two-peak pattern and positively correlated.

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孙龙,彭祚登,王冲,杨腾. 干旱胁迫对两种沙地灌木能源树种光合特性的影响[J]. 南京林业大学学报（自然科学版）. 2014, 38(02): 99-104 https://doi.org/10.3969/j.issn.1000-2006.2014.02.019

SUN Long, PENG Zuodeng,WANG Chong,YANG Teng. Effect of drought stress on photosynthetic characteristics of two energy resource sandy shrubs[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2014, 38(02): 99-104 https://doi.org/10.3969/j.issn.1000-2006.2014.02.019

中图分类号： S718

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基金

收稿日期:2013-05-10 修回日期:2013-10-16
基金项目:教育部博士点基金优先发展领域课题(2012001413001)
第一作者:孙龙,硕士生。*通信作者:彭祚登,副教授。E-mail: zuodeng@sina.com。
引文格式:孙龙,彭祚登,王冲,等. 干旱胁迫对两种沙地灌木能源树种光合特性的影响[J]. 南京林业大学学报:自然科学版,2014,38(2):99-104.