铜镉污染土壤上CO_2升高对水稻光合特性的影响  

Effects of Elevated CO_2 Levels on the Photosynthetic Characteristics of Rice in Soil Contaminated with Heavy Metals

作　　者：王潇[1,2] 宋正国[2] 武慧斌[2] 邹洪涛[1] 

机构地区：[1]沈阳农业大学,辽宁沈阳110866 [2]农业部环境保护科研监测所生态毒理与环境修复研究中心,天津300191

出　　处：《核农学报》2013年第6期839-847,共9页Journal of Nuclear Agricultural Sciences

基　　金：国家自然科学基金(41071217)

摘　　要：采用盆栽试验,在开顶式气室(Open Top Chamber,OTC)中种植水稻,研究了南北方10个水稻品种(5种籼稻、5种粳稻)在CO2浓度升高下不同污染土壤上不同生育期的光合特性影响。研究结果表明:高CO2浓度和正常CO2浓度条件下,大部分的水稻品种最大光合速率在分蘖期,在成熟期最小;CO2浓度升高使水稻在不同生育期光合速率都增加,且在不同污染土壤上的水稻品种光合速率变化一致,5种粳稻光合速率增加幅度均在抽穗期最大,其增加幅度在高污染土壤和低污染土壤上分别为:64.14%～143.19%、73.58%～132.3%,5种籼稻光合速率增加幅度均在成熟期最大,其增加幅度在高污染土壤和低污染土壤上分别为:104.33%～256.00%、100.99%～254.81%。CO2浓度的升高对光合速率、胞间CO2浓度的影响表现出趋势一致性变化,且都达到了显著水平,气孔导度与蒸腾速率在CO2浓度升高的情况下在各个生育期的变化趋势不一致,且都没有达到显著水平。The pot experiments were conducted to investigate the impact of elevated CO2 levels on the photosynthetic characteristics of ten rice cultivars（including five japonica rice and five indica rice） at various growth stages,growing in the contaminated soils.The results showed the highest photosynthetic rate of most rice species appeared at tillering stage,whereas was lowest at mature stage,under the condition of high and normal CO2 concentration.Furthermore,the photosynthetic rate of all rice species increased with CO2 concentration increasing,and the variation patterns of photosynthetic rates of the rice species in different contaminated soils were consistent.The increase rates of photosynthetic rate for five japonica rice reached to the highest at the tillering stage which were from 64.14% to 143.19% in the severely polluted soil and,from 73.58% to 132.3% in the slightly polluted soil.However,the highest increase rates for five indica rice were present at mature stage that were from 104.33% to 256.00% in the severely polluted soil and from 100.99% to 254.81% in the slightly polluted soil,respectively.The influence of elevated CO2 on photosynthetic rate and intercellular CO2 concentration followed a highly similar pattern,similarity of which was statistically significant;while the stomatal conductance and transpiration rate at different growth stages displayed an inconsistent pattern,but it was not significantly different.

关 键 词：水稻 CO2浓度升高 污染土壤 光合特性 

分 类 号：S511[农业科学—作物学]