【摘要】 采用小型蒸渗仪法研究了北京地区中苜1号和WL323紫花苜蓿建植当年的耗水系数和水分利用效率。结果表明,中苜1号和WL323的生物产量耗水系数分别为915.0和939.7,经济产量耗水系数分别为786.9和808.1,2个品种之间差异不显著;不同茬次之间差异显著(P<0.05),第2茬最低,第3茬最高;中苜1号和WL323的地上部生物产量的水分利用效率分别为11.0和10.6kg/(mm.hm2),全部生物产量分别为19.2和17.9kg/(mm.hm2),经济产量水分利用效率分别为12.8和12.3kg/(mm.hm2),2个品种之间差异不显著;不同茬次之间差异显著(P<0.05),第2茬最高,第3茬最低。更多还原

【Abstract】 The water consumption coefficient(WCC) and water use efficiency(WUE) of Zhongmu No.1 and WL323 Medicago sativain the establishment year in the Beijing plain were studied with a micro-lysimeter.The WCCs based on biological yield of Zhongmu No.1 and WL323 were 915.0 and 939.7 and based on economic yield were 786.9 and 808.1,respectively with no significant differences between varieties.The WCCs at different harvests were significantly different(P<0.05),and lowest at the 2nd harvest but highest at the 3rd harvest.The WUEs based on above-ground biological yield of Zhongmu No.1 and WL323 were 11.0 and 10.6 kg/(mm·hm2),while those based on whole biological yield were 19.2 and 17.9 kg/(mm·hm2) and those based oneconomic yield were 12.8 and 12.3 kg/(mm·hm2),respectively.There were no significant differences between varieties.The WUEs at different harvests were significantly different(P<0.05) and were highest at 2nd but lowest at the 3rd harvest.更多还原