论文部分内容阅读
１９９１～１９９５年对陇东旱地冬小麦套种玉米的增产效果，土壤水分利用，组合耗水量及玉米根际补偿供水效应等研究结果表明：①旱地小麦玉米套种具有增产增收和资源高效利用的优势，土地当量比、收益当量比、光能利用率、降水生产效率分别达１．２１５、１．１９９、０．２０５％、８．６９ｋｇ／ｍｍ·ｈｍ２；②边行优势是小麦玉米套种增产的关键，但小麦对土壤水分的竞争利用是玉米带土壤水分不足的主要原因。小麦玉米套种组合耗水量明显小于玉米、小麦单作的累加值，水分缺额为１１０．２～１５３．８ｍｍ；③玉米根际补偿供水具有明显的增产效果，但供水效应在不同降水年型之间差异较大
From 1991 to 1995, the yield-increasing effects of winter wheat intercropping maize on dryland of East Gansu, soil water use, combined water consumption and corn rhizosphere compensatory water supply effect were studied. The results showed that: (1) Wheat maize intercropping in dryland has the advantages of increasing yield and utilizing resources efficiently; Equivalence ratio, yield equivalence ratio, light energy utilization rate and precipitation production efficiency reached 1.215,1.199,0.205% and 8.69kg / mm · hm2, respectively. ② The advantage of the borderline is the key to the wheat yield increase. However, the competition of wheat for soil moisture is the main reason for insufficient soil moisture in corn belt. The wheat-corn intercropping water consumption was significantly less than that of corn and wheat alone, and the water deficit was 110.2-153.8mm. (3) The corn rhizosphere compensation water supply had a significant stimulation effect, but the water supply effect was between different precipitation years big different