为了明确大气CO2浓度升高(e[CO2])对玉米与花生间作体系中玉米"源-库"特性的影响，本试验以环境CO2浓度(a[CO2])为对照，分别在0(P0)和180 kg P2O5·hm-2(P180)两个磷水平下，分析了 e[CO2]下间作玉米的叶"源"量、气体交换参数、群体"源"生产能力、"库"容量、粒/叶、产量和间作优势。结果表明:与a[CO2]相比，e[CO2]提高了间作玉米的叶"源"量和"源"活性，显著增强了群体"源"生产能力;最大花丝数、实际结籽数和有效"库"容分别增加了 8。0％～9。3％、10。0％～13。4％和10。4％～20。8％，籽粒平均干物质积累速率显著提高了 10。7％～50。4％;粒/叶和收获指数分别增大了 3。3％～7。4％和2。4％～7。9％;间作玉米产量和间作优势分别提高了 10。8％～48。7％和20。4％～102。7％。施磷能进一步改善间作玉米的"源-库"关系，提高间作玉米产量，增加间作优势。综上，e[CO2]可增强间作玉米"源"的性能，增大"库"容，促进籽粒灌浆，协调"源-库"关系，从而提高间作产量和偏土地当量比，增加间作优势。
Response of intercropped maize"source-sink"characteristics to elevated CO2 concentration and phospho-rus application in maize intercropping with peanut system
This study aimed to clarify the impacts of elevating CO2 concentration(e[CO2])on maize"source-sink"characteristics in maize intercropping with peanut system.We investigated the impacts of e[CO2]on leaf"source"quantity,gas exchange parameters,population"source"productivity,"sink"capacity,grain to leaf ratio,yield and intercropping advantage of maize under 0(Po)and 180 kg P2O5·hm-2(P180).The results showed that compared with ambient CO2 concentration(a[CO2]),e[CO2]augmented leaf"source"quantity and"source"activity of intercropping maize,and significantly increased productivity of population"source".The silk maximum number,actual seed number and effective"sink"capacity were increased by 8.0％-9.3％,10.0％-13.4％,and 10.4％-20.8％,respectively.Concurrently,the average dry matter accumulation rate of grains was significantly increased by 10.7％-50.4％.The grain to leaf ratio and harvest index were increased by 3.3％-7.4％and 2.4％-7.9％,respectively.The yield and intercropping advantage were increased by 10.8％-48.7％and 20.4％-102.7％,respectively.Under e[CO2],phosphorus application could further improve the"source-sink"relationship and maize yield,and increase the intercropping advantage.In summary,e[CO2]enhanced the"source"performance and"sink"capacity of intercropping maize,promoted grain filling,regulated the"source-sink"relationship,enhanced yield,and thus increased the intercropping advantage.
maize intercropping with peanutelevated CO2 concentration"source"characteristics"sink"cha-racteristicsintercropping advantage
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