三熟制小麦丰产群体光合生产研究
Studies on the Photo- production for High Grain Yielding a Wheat Colony in Annual Three-crop System
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摘要: 小麦产量决定于作物生长率(CGR).产量4t/hm2的三熟制小麦平均CGR为8.9g/(m2·d),最大叶面积指数(LAI)5.1~5.2,全生育用平均净同化率(NAR)3.6g/(m2·d),在常年平均太阳辐射(S)1000J/(cm2·d)条件下,光能利用率(Eu)1.45%.多元分析表明:在生长全过程,LAI与CGR呈极显着正相关,而达到最适LAI值的丰产群体,NAR对CGR具有决定性的影响。孕穗~黄熟期的光合生产受S所制约。华南麦区小麦孕穗后的S因春雨早迟盛弱而年际波动颇大,由此引发年景的丰歉。Abstract: The research results showed that the wheat yield was determined by Colony Growth Rate(CGR).At the level of 4t/hm2 grain yield of wheat in annual three-crop system the average CGR showed 8.9g/(m2·d),the greatest Leaf Area Index (LAI) arrived 5.1─5.2 and the aver-age Net Assimilation Rate(NAR) of growth period appeared 3.6g(m2 ·d).In the condition with the average annual Solar Radiation(S)100J/(cm2·d),the Light Energy Utilization Rate (Eu) of wheat arrived 1.45%.The results of multiple correlation analysis showed that during wheat growth period the LAI appeared extremely significant positive correlation to CGR.In the high grain yielding colony with the most suitable LAI, the NAR was the decisive factor to CGR.From booting stage to yellow mature the photo- productoin was restricted by S.In Southern China re-gions, after booting stage, the S appeared fluctuating significantly according to the coming dura-tion and raining situation of the spring rain in different years, which make up the variable yields in different years.
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[1] 户刈羲次,1973.作物の光合成七物质生产,养贤堂 [2] Thorne, G. N. 1974. Rep. Rothamsted Exp. Sta. for 1973 Part,2: 5~25
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