Study on the Diurnal Variations of Photosynthetic Characteristics and Water Use Efficiency of Stipa bungeana Trin.Under Drought Stress

doi:10.11733/j.issn.1007-0435.2009.04.019

›› 2009, Vol. 17 ›› Issue (4): 510-514.DOI: 10.11733/j.issn.1007-0435.2009.04.019

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Study on the Diurnal Variations of Photosynthetic Characteristics and Water Use Efficiency of Stipa bungeana Trin.Under Drought Stress

ZHOU Qiu-ping¹, CHENG JI-min², WAN Hui-e², YU Jing²

1. College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province.712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, Shaanxi Province.712100, China

Received:2008-12-20 Revised:2009-03-16 Online:2009-08-15 Published:2009-08-15

干旱胁迫下本氏针茅光合特性和水分利用效率日动态研究

周秋平¹, 程积民², 万惠娥², 俞靓²

1. 西北农林科技大学资源环境学院;
2. 中国科学院水利部水土保持研究所, 杨凌, 712100

通讯作者: 程积民
作者简介:周秋平(1983- ),女,硕士研究生,研究方向为流域生态学,E-mail:zhouqiuping_110@yahoo.com.cn
基金资助:
中国科学院重要方向项目(KZCX2-YW-441);国家重点基础研究发展计划973项目(2007CB106803);国家科技支撑计划重大项目(2006BAD16B06);国家自然科学基金重点项目(40730631);国家林业局荒漠化监测专项基金

Abstract

Abstract: The diurnal variations of photosynthetic characteristics of Stipa bungeana Trin.were measured under pot planting and water controlling condition using the Li-6400 portable photosynthesis system.The results show that the diurnal course of net photosynthetic rate was displayed in a two-peak pattern with a typical midday depression pattern under different drought stress;the net photosynthetic rate in forenoon was higher than that in afternoon and increased along with the raising of soil moisture.The diurnal course of transpiration rate was also displayed in a two-peak course and the higher transpiration rate was corresponding to the higher soil moisture.The stomatal conductance was affected by soil moisture and stress of light and heat,and the diurnal dynamics was a concave form.The intercellular CO₂ concentration was affected by the atmosphere CO₂ concentration and stomatal conductance with higher value in morning and evening and lower in midday.The water use efficiency culminated in the early morning and decreased along with the raising of soil moisture.

Key words: Stipa bungeana Trin., Soil moisture, Photosynthetic rate, Transpiration rate, Water use efficiency

摘要： 采用盆栽和人工控制土壤水分的方法,使用Li-6400便携式光合测定系统观测本氏针茅(Stipa bungeana)光合生理生态特征的日变化.结果表明:在不同土壤水分状况下,本氏针茅净光合速率日变化曲线均呈"双峰"型,并有不同程度的"午休"现象,且上午的净光合速率明显高于下午,随着土壤水分的升高而增加;蒸腾速率日变化曲线也呈"双峰"型,表现为较高土壤水分处理针茅具有较高的蒸腾速率;气孔导度受水分和光热胁迫的影响,日变化曲线呈凹型;胞间CO₂浓度受空气CO₂浓度和气孔导度的双重影响,呈现早晚高,正午低的日变化进程;水分利用效率最高值出现在上午较早的时段,随着土壤水分的增加,水分利用效率却降低.

关键词: 本氏针茅, 土壤水分, 光合速率, 蒸腾速率, 水分利用效率

CLC Number:

S311
S812

ZHOU Qiu-ping, CHENG JI-min, WAN Hui-e, YU Jing. Study on the Diurnal Variations of Photosynthetic Characteristics and Water Use Efficiency of Stipa bungeana Trin.Under Drought Stress[J]. , 2009, 17(4): 510-514.

周秋平, 程积民, 万惠娥, 俞靓. 干旱胁迫下本氏针茅光合特性和水分利用效率日动态研究[J]. , 2009, 17(4): 510-514.

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Study on the Diurnal Variations of Photosynthetic Characteristics and Water Use Efficiency of Stipa bungeana Trin.Under Drought Stress

干旱胁迫下本氏针茅光合特性和水分利用效率日动态研究

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