樟子松(Pinus sylvestnis var. mongolica)幼苗对持续风吹的光合生理响应

doi:10.7522/j.issn.1000-694X.2014.00133

摘要/Abstract

摘要： 樟子松(Pinus sylvestnis var. mongolica)是中国北方沙区推广面积最大的常绿乔木树种之一。为了解其幼苗对持续风吹的光合生理响应,2013年春季在内蒙古科尔沁沙地研究了0(CK)、6、9、12、15、18 m·s^-1等梯度风速1 h持续吹袭下3龄樟子松幼苗光合速率(P_n)、蒸腾速率(Tr)、水分利用效率(WUE)、气孔导度(G_s)和胞间CO₂浓度(C_i)等指标的变化。结果表明:(1)随着风速的增强,其叶片温度和相对含水量趋于下降,和CK相比,18 m·s^-1处理的叶片温度和相对含水量分别下降1.6%和2.9%;(2)和CK一样,不同风速处理下其P_n、Tr和WUE的日变化均为单峰曲线,G_s呈下滑曲线,C_i浓度呈V形曲线,显示风吹强度的增加没有改变樟子松幼苗的光合特征的日变化规律;(3)低风速(6~9 m·s^-1)持续风吹导致其日均P_n、Tr、G_s降低,但日均C_i和WUE变化不显著;(4)高风速(12~18 m·s^-1)下,除18 m·s^-1处理G_s下降外,其日均P_n、Tr、G_s、C_i均趋于增加,但WUE下降;(5)高风速风吹下,G_s和C_i的增加是其P_n、Tr增加的主要原因,低风速风吹下其P_n和Tr的降低也源于G_s和C_i的下降。

关键词: 樟子松(Pinus sylvestnis var. mongolica)幼苗, 风吹, 光合速率, 蒸腾速率, 水分利用效率

Abstract: In order to understand responses of photosynthesis and water metabolism of Pinus sylvestnis var. mongolica seedlings to continuous wind blowing, a wind tunnel experiment with a wind speed gradient wind of 0 (CK)、6、9、12、15 and 18 m·s^-1 was conducted in the Horqin Sandy Land in Spring, 2013. The results showed that the leaf temperature and leaf relative water contents tended to decrease with increase of wind speed, which decreased by 1.6% and 2.9% in the 18 m·s^-1 treatment than the CK, respectively. (2)in the different treatments, diurnal changes of the photosynthetic rate, transpiration rate and water use efficiency represented as single peak curve, change of the stomatal conductance was downward curve, change of the intercellular CO₂ concentration was a V curve, which suggested that changes of the wind speed didn't altered the diurnal regular patterns in these properties. (3)the lower wind speed (6-9 m·s^-1) resulted in decrease of the peak value and diurnal average value of photosynthetic rate and stomatal conductance, increase of the water use efficiency, but a not significant change of the peak value and diurnal average value of the intercellular CO₂ concentration. (4)in the higher wind speed treatments (12-18 m·s^-1), the peak values and diurnal average values of the photosynthetic rate and transpiration rate increased, water use efficiency decreased, the decreased magnitude of the stomatal conductance was greater compared to the lower wind speed; (5)At the high wind speed, the increase of photosynthetic rate and transpiration rate was mainly attributed to increase of stomatal conductance and intercellular CO₂ concentration, decrease of photosynthetic rate and transpiration rate at the lower wind resulted mainly from decrease of stomatal conductance and intercellular CO₂ concentration.

Key words: Pinus sylvestnis var. mongolica seedlings, wind blowing, photosynthetic rate, transpiration rate, water use efficiency

中图分类号:

Q948.3

毛新安, 赵哈林, 李瑾, 周瑞莲, 云建英, 曲浩, 潘成臣. 樟子松(Pinus sylvestnis var. mongolica)幼苗对持续风吹的光合生理响应[J]. 中国沙漠, 2016, 36(1): 64-70.

Mao Xinan, Zhao Halin, Li Jin, Zhou Ruilian, Yun Jianying, Qu Hao, Pan Chengchen. Responds of Photosynthetic Physiology of Pinus sylvestnis var. mongolica Seedlings to Continuous Wind Blowing[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(1): 64-70.

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