风沙流短暂吹袭对樟子松(Pinus sylvestris var.mongolica)幼苗光合蒸腾特性的影响  

Effects of Brief Sand-drift Wind Blowing on Photosynthesis and Transpiration Properties of Pinus sylvestris var.mongolica Seedlings

作　　者：赵哈林[1] 李瑾[1] 周瑞莲[2] 云建英[1] 冯静[1] 苏娜[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 [2]鲁东大学生命学院,山东烟台264025

出　　处：《中国沙漠》2017年第2期254-260,共7页Journal of Desert Research

基　　金：国家自然科学基金项目(31270752;30972422)

摘　　要：为了解风沙流短暂吹袭对樟子松(Pinus sylvestris var.mongolica)幼苗光合蒸腾特性的影响,2013年6月在科尔沁沙地测定了0(CK)、6、9、12、15m·s^(-1)和18m·s^(-1)等6个梯度风速10 min风沙流(风沙流强度分别为0.00、1.00、28.30、63.28、111.82、172.93g·cm^(-1)·min^(-1))短暂吹袭下樟子松幼苗光合蒸腾速率和水分利用效率等指标的变化。结果表明:(1)短暂的风沙流吹袭对樟子松幼苗蒸腾速率和胞间CO_2浓度的日变化规律影响较小,但可改变其光合速率和气孔导度的日变化规律;(2)15m·s^(-1)和18m·s^(-1)的强风沙流吹袭可导致其日最大光合速率、蒸腾速率和气孔导度大幅度下降,和CK相比下降幅度分别为22.30%和21.98%、22.87%和22.31%、24.28%和17.45%;(3)短暂的风沙流吹袭可导致其日均光合速率显著降低,日均蒸腾速率和气孔导度波动式下降,日均胞间CO_2浓度波动式增加,和CK相比,15 m·s^(-1)和18 m·s^(-1)处理的日均光合速率下降13.26%和11.60%,日均蒸腾速率下降7.93%和8.38%,气孔导度下降1.42%和8.54%,胞间CO_2浓度增加9.07%和3.22%;(4)短暂的风沙流吹袭没有导致其水分利用效率明显变化,但致其光能利用效率显著降低;(5)风沙流胁迫下,其光合速率和蒸腾速率的下降主要受制于气孔导度的降低,其光能利用效率的降低主要源于光合速率和气孔导度的下降。In order to understand effects of brief sand-drift wind on photosynthesis and transpiration proper- ties of Pinus sylvestris var. mongolica saplings, a field wind blowing experiment with a gradient of wind speed （0, 6, 9, 12, 15, 18 m. s-1 ）and sand-drift wind intensities （0.00, 1.00, 28.30, 63.28, 111.82, 172.93 g. cm-1. min 1 ）was conducted in June, 2013 in the Horqin Sand Land of Inner Mongolia. The results showed that： （1） brief sand-drift wind blowing had a lesser effects to diurnal variation pattern of Tr and C~ of P. sylvestris var. mongolica seedlings, but could change its diurnal variation pattern of P. and G s ; （2） Strong sand-drift wind blowing with 15 m. s-1 and 18 m. s-1 wind speed resulted in a great decrease of the daily maximum P,, Tr and Gs, which decreased by 22.30% and21.98%, 22.87% and 22.31% ,24.28% and 17.45 %, respectively, compared to the CK; （3） with increase of sand-drift wind intensity, daily average P,, Tr and Gs tended to decrease and daily average Ci tended to increased, which decreased by 13.26% and 11.60% in the Pn, 7.93% and 8.38% in the Tr and 1.42% and 8.54% in the Gs, increased by 9.07% and 3.22% in the Ci, respectively, in the 15 m.s-1 and 18 m.s-1 treatments compared to the CK; （4） brief sand-drift wind blowing did not resulted in significant changes to WUN of the seedlings, but resulted in a significant decrease of the light energy utilization efficiency; （5） in the sand-drift wind stress, the decrease of the Pn and Tr resulted mainly from decrease of the Gs, the decrease of the light energy uti- lization efficiency resulted mainly from decrease of the Pn and Gs.

关 键 词：樟子松(Pinus sylvestris var.mongolica)幼苗 风沙流吹袭 光合速率 蒸腾速率 水分利用效率 

分 类 号：Q948.3[生物学—植物学]