大气CO2富集对根际NaCl盐渍的人参果植株干物质生产和水分利用的影响
投稿时间:2011-10-06  修订日期:2011-12-30  点此下载全文
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陈凯 德国波恩大学果树与蔬菜研究所, 德国波恩市D-53121 
胡国谦 德国波恩大学果树与蔬菜研究所, 德国波恩市D-53121 
KEUTGEN Norbert 德国波恩大学果树与蔬菜研究所, 德国波恩市D-53121 
KEUTGEN Anna 德国波恩大学果树与蔬菜研究所, 德国波恩市D-53121 
JANSSENS Marc 德国波恩大学果树与蔬菜研究所, 德国波恩市D-53121 
LENZ Fritz 德国波恩大学果树与蔬菜研究所, 德国波恩市D-53121 
中文摘要:对单株砂培盆栽的半木质化枝条扦插生根的一月龄人生果(Solanum muricatum Ait.)栽培品种"Xotus",每周浇两次200mL NaCl质量浓度分别为0mg·L-1和25mg·L-1的Hoagland营养液处理2个月,第二个月在控制空气CO2体积分数为(350±10)×10-6、(700±10)×10-6和(1050±10)×10-6的植物生长箱内试验。结果表明,人参果植株干物质生产量和耗水量受根际NaCl盐渍而下降,又随大气CO2升高而增加。根际NaCl盐渍能增大植株叶片蒸腾系数、根/冠比和干物质向枝干和根部分配的比例及积累量,降低根系吸收水分的效率和耗水量。升高大气CO2能促进叶片发育及干物质向地上部其他器官和地下部组织分配,增加总叶面积、比叶干重和各种器官中干物质增长量,提高干物质生产率和水分利用率。根际经25mg·L-1NaCl盐渍处理的植株,总干物质增长量和水分利用率相应下降50%~54%和24%~37%;与350×10-6CO2的处理的植株相比,700×10-6及1050×10-6CO2的处理分别使这两项指标提高到79%~106%和61%~88%以及133%~189%和99%~142%。大气CO2富集能改善受NaCl盐渍的植株干物质生产力、提高水分利用率。根际NaCl盐渍和大气CO2富集对人参果植株干物质生产和水分利用有生物互作效应。它们的共同作用会促进植株干物质的增长及叶片中合成的干物质向其他器官分配,提高干物质生产率和水分利用率,同时减少总叶面积、枝条和根系干重、根系吸水效率、植株耗水量和叶片蒸腾系数。因此,全球大气CO2富集将有利于该作物的干物质生产和水分利用。
中文关键词:人参果  土壤NaCl盐渍  大气CO2富集  植物干物质生产  干物质分配  植物耗水量  水分利用率
 
Effects of atmospheric CO2 enrichment on dry mass production and water consumption of NaCl salinity-stressed pepino plants
Abstract:One-month old,rooted semi-hardwood cutting plants of pepino(Solanum muricatum Ait.) cv."Xotus" in sand-potted culture were treated by 200 mL Hoagland nutrient solution with or without additional 25 mg·L-1 NaCl twice a week for 2 months,and exposed to(350±10),(700±10) or(1 050±10)×10-6 atmospheric CO2 in controlled environment chambers during the last month of the experiment,respectively.Dry mass production and water consumption of the plants decreased with NaCl salinity in the root medium,but increased with atmospheric CO2 enrichment.Salinity raised the leaf transpiration index,root/shoot ratio,and relative distributions of dry mass into stems and roots,while reduced dry mass accumulation in other organs,water-uptake efficiency of the roots,and water consumption of the plants.High CO2 concentrations,however,accelerated foliage development,increased total leaf area,specific leaf weight,daily increment of dry mass in plant organs and dry mass allocation to both aboveground and underground organs,accompanied by an increased dry mass-production efficiency,total water consumption and water-use efficiency of the plants.Total dry mass increment and water-use efficiency of the plants decreased by 50%—54% and 24%—37% due to salinity in the rhizosphere,but increased by 79%—106% and 61%—88% at 700×10-6 CO2,and by 133%—189% and 99%—142% at 1 050×10-6 CO2 in comparison with the 350×10-6 CO2 treatment,accordingly.Atmospheric CO2 enrichment tended to improve dry mass productivity of NaCl-stressed plants by improving water-use efficiency of the plants.There were interactive effects of the combined NaCl salinity and CO2 enrichment treatments on dry mass production and water consumption of the plants.Combined environmental conditions of rhizospheric NaCl salinity and atmospheric CO2 enrichment promoted daily increment and relative distribution of leaf dry mass,dry mass-production efficiency and water-use efficiency of the plants,reduced total leaf area,shoot and root dry weight,water consumption of the plants,water-uptake efficiency of the roots and leaf transpiration index of the plants,correspondingly.Therefore,the global atmospheric CO2 enrichment will be of benefit for dry mass production and water utilization of this crop.
keywords:pepino  rhizospheric NaCl salinity  atmospheric CO2 enrichment  dry mass production  dry mass allocation  plant water-consumption  water-use efficiency
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