纳米TiO_2对髯毛箬竹光合作用日变化的影响  

Effects of Nano-meter TiO_2 on Diurnal Variation of Photosynthesis of Indocalamus barbatus McClure

作　　者：李博[1,2] 陶功胜[1] 谢寅峰[1] 蔡贤雷[1] 

机构地区：[1]南京林业大学森林资源与环境学院,江苏南京210037 [2]江苏连云港市委农村工作办公室,江苏连云港222003

出　　处：《西北林学院学报》2012年第1期35-39,共5页Journal of Northwest Forestry University

基　　金：国家自然科学基金项目(39900115);江苏省高校自然科学基金项目(05KJB220053);江苏高校优势学科建设工程项目(2011)

摘　　要：以髯毛箬竹为试验材料,于10月采用叶面喷施的处理方法,研究不同浓度(0、150、300、450mg.L-1)的纳米TiO2对髯毛箬竹光合日变化的影响,结果表明:与对照相比,各浓度的纳米TiO2处理均能不同程度地提高髯毛箬竹的净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr),缓解光合"午休"现象,其中以150mg.L-1纳米TiO2处理的促进效果最佳。在10:00和午休的12:00时,150mg.L-1纳米TiO2处理的Pn、Gs及Tr分别比对照提高了9.7%、30.41%、17.97%,和41.84%、20.79%、18.57%,均与对照差异显著。髯毛箬竹光合能力的提高是气孔因素和非气孔限制因素共同作用的结果,其中光合"午休"现象的缓解主要通过非气孔限制因素的改善,而最大光合能力的提高主要通过气孔因素来调节。Effects of different concentrations of nano-meter TiO2 （0,150,300,450 mg · L^-1 ） on diurnal variation of photosynthesis of Indocalamus barbatus McClure were examined by foliar spraying in October. The results showed that compared to the control, all treatments of different concentrations of TiO2 could increase net photosynthetic rate （Pn）, transpiration rate （Tr） and stomatal conductance （Gs） which eased the photosynthetic ＂midday depression＂. Among them, the 150 mg · L^-1 group could get the best effect. Compared to control, the Pn,Gs and Tr of the 150 mg · L^-1 group increased by 9.7%,30.41%,17.97% and 41.84% ,20.79% ,18.57% respectively at 10：00 and midday depression at 12.00, which were significantly different from the control. The improvement of photosynthetic capacity of I. barbatus were resulted from both stomatal and non stomatal limitation factors. The improvement of photosynthetic ＂midday depression＂ was mainly resulted from non-stomatal limitation, and the increase of the maximum photosynthetic capacity was caused primarily by stomatal factors.

关 键 词：纳米TIO2 髯毛箬竹 气体交换参数 日变化 

分 类 号：S795.5[农业科学—林木遗传育种]