交替灌溉小麦间作玉米干物质的累积与分配规律研究

Dry matter accumulation and distribution of alternately irrigated wheat/maize intercropping

针对传统间作耗水量大，且灌水与间作作物干物质累积相关关系研究薄弱的问题，在河西绿洲灌区进行田间试验，探究交替灌溉模式下，不同水分处理对小麦间作玉米及其相应单作的产量及干物质分配积累的影响.结果表明：交替灌溉小麦间作玉米LER达到1.30～1.38；净地面积下，间作小麦经济产量较单作小麦提高了21%～33%，间作玉米经济产量较单作玉米提高了38%～42%；小麦收获后，间作玉米干物质积累量比单作玉米平均增加8%；低、中、高灌水平下间作玉米群体生长率分别为单作的49.62%～61.92%、56.04%～65.84%和55.28%～68.98%.在河西绿洲灌区，小麦间作玉米上应用交替灌溉技术与单作相比具有提高间作作物产量和增加干物质积累的作用.

Due to heavy water consumption of traditional intercropping and lacking of researches on cor-relation between irrigation and dry matter accumulation of intercrops,a field experiment was conducted to investigate how the alternate irrigation affected crop yield and dry matter.This study analyzed the impact on accumulation and distribution of dry matter in intercropping and its corresponding monoculture under various irrigation treatments.The purpose of this study was to provide theoretical evidence for efficient ir-rigation strategies of intercropping.The results showed that,there was a significant increase of land equiva-lent ratio （LER）in the alternately irrigated wheat/maize intercropping treatment,with the LER values ranging from 1.30 to 1.38.When compared to sole wheat and sole corn,the yield of different intercropping treatment increased 21%~33% and 38%~42%.Dry matter accumulation of intercropping increased 8%than sole maize after the wheat harvesting.Crop growth rate of corn in intercropping under the low,medi-um and high irrigation amount increased 49.62%~61.92%,56.04%~65.84% and 55.28%~68.98%. The results suggested that alternate irrigation applied into intercropping systems in arid oasis regions could reach the purpose of increasing grain yield and promoting dry matter accumulation.