开放式空气CO_2浓度增高条件下C_3作物(水稻)与C_4杂草(稗草)的竞争关系  

Effect of FACE on competition between a C_3 crop (rice,Oryza sativa) and a C_4 weed (barnyardgrass,Echinochloa crusgalli).

作　　者：曾青[1] 朱建国[1] 刘刚[1] 韩勇[1] 张雅莉[1] 谢祖彬[1] 马红亮[1] 程磊[1] 

机构地区：[1]中国科学院南京土壤研究所物质循环开放实验室,南京210008

出　　处：《应用生态学报》2002年第10期1231-1234,共4页Chinese Journal of Applied Ecology

基　　金：中国科学院知识创新重要方向项目 (KZCX2 40 8);国家自然科学基金重大国际合作研究资助项目 (4 0 12 0 14 0 817) .

摘　　要：通过田间试验 ,研究了FACE(开放式空气CO2 浓度升高 )条件下C3 作物水稻 (Oryzasativa)和C4杂草稗草 (Echinochloacrusgalli)的生长和竞争关系 .结果表明 ,FACE条件下C3 植物水稻生物量和产量增加 ,叶片数增加 ,分蘖数增加 ,叶面积系数 (LAI)增大 ;而C4植物稗草相反 .FACE条件下水稻和稗草叶面积均减少 ,而净同化率 (NAR)均增加 .FACE条件下水稻 稗草比例为 1∶1时 ,水稻与稗草的生物量比率、产量比率、LAI比率、茎蘖比率和NAR比率均增加 ,水稻 稗草的竞争关系发生变化 ,水稻 (C3 植物 )竞争能力增加 ,稗草 (C4植物 )竞争能力下降 .The growth and competition of a C 3 crop rice and a C 4 weed, barnyardgrass under FACE(free-air carbon dioxide enrichment) conditions were studied by field experiment. The results showed that under FACE condition,the biomass and yield,leaf number, tiller number,and leaf area index of rice increased, while those of barnyardgrass decreased.Both of the leaf area indexed of rice and barnyardgrass were decreased, while their net assimilation rate increased. When the ratio of planting density of rice and barnyardgrass was 1∶1, all of the ratio of biomass, yield, leaf area index, tiller and net assimilation rate were increased under FACE condition. It indicated that the competition between rice and barnyardgrass changed under FACE condition. The competition ability of rice(C 3 crop) was enhanced relatively, while that of barnyardgrass weakened.

关 键 词：开放式空气CO2浓度增高 C3作物 水稻 C4杂草 稗草 竞争关系 

分 类 号：S511[农业科学—作物学]