期刊论文

Response of chlorophyll fluorescence characteristic of Zelkova schneideriana sapling to Pb pollution

中文

中南林业科技大学学报

1673-923X

2018

38

6

123-129

10.14067/j.cnki.1673-923x.2018.06.019

2017NK2171:湖南省重点研发计划项目 2014-4-62:引进国际先进林业科学技术项目项目) :湖南省财政厅研究经费资助项目

本校为其他机构

以阔叶树种榉树1年生幼树为对象,采用室内盆栽,通过4次连续掺入PbCl_2溶液于土壤中,研究连续Pb处理榉树叶片的光合和光系统Ⅱ (PS Ⅱ)叶绿素荧光特性,以揭示铅胁迫下榉树抗逆性的机制。结果表明, 4次Pb处理下榉树的最大净光合速率(P_n)、蒸腾速率(T_r)、气孔导度(G_s)和气孔阀值(L_s)均表现为Pb处理对照,出现了由非气孔限制引起的P_n下降。4次Pb处理下PS Ⅱ最大光化学效率(F_v/F_m)、PS Ⅱ实际光化学效率(Y Ⅱ)均低于对照,其中Y Ⅱ差异显著(P < 0.05);光化学猝灭(qP)显著降低,非光化学猝灭(NPQ)显著升高,说明榉树在铅胁迫下发生了明显光抑制现象,但有效地将PS Ⅱ的过剩光能以热的形式耗散掉。铅...

Pot experiment study was applied on one-year-old sapling of broad-leaf species Zelkova schneideriana. Photosynthesis and PS Ⅱ chlorophyll fluorescence characteristic of Z. schneideriana blade was tested through four times' continuous spraying of PbCl_2 solution in order to reveal the mechanism of lead (Pb) resistance. The results showed that with four times' Pb dealing, the maximum net photosynthetic rate (P_n), transpiration rate (T_r), stomatal conductance (G_s), and limited stomatal value (L_s) were significantlyless than the control (P < 0...