不同年限紫花苜蓿(生长)水分利用效率和耗水系数的差异  

Difference of water use efficiency and water consumption coefficient of alfalfa different in growing season

作　　者：孙洪仁[1] 关天复[1] 孙建益[1] 武瑞鑫[1] 李品红[1] 

机构地区：[1]中国农业大学草地研究所,北京100193

出　　处：《草业科学》2009年第3期39-42,共4页Pratacultural Science

基　　金：农业部"948"国际先进农业科技引进重大专项"优质草产品加工技术"(2006-G38);科技部"十一五"科技支撑"优质草产品加工与高效利用关键技术研究"(2006BAD16B03);农业部公益性行业科研专项"人工草地优质牧草生产技术研究与示范"(nyhyzx07-022)

摘　　要：采用小型蒸渗仪法,在北京平原区研究了一年生和二年生紫花苜蓿Medicago sativa水分利用效率和耗水系数的差异。研究结果表明:二年生紫花苜蓿的生物产量和经济产量水分利用效率[14.7和17.1kg/(hm2.mm)]显著高于一年生紫花苜蓿[12.6和14.7 kg/(hm2.mm)](P<0.05);生物产量和经济产量耗水系数(679和584)显著低于一年生紫花苜蓿(793和682)(P<0.05)。研究表明生长年限对紫花苜蓿的水分利用效率和耗水系数具有影响。Difference of water use efficiency（WUE） and water consumption coefficient（WCC） of alfalfa（Medicago sativa） between the first growing season and the second growing season was studied in Beijing plain with micro-lysimeter.The results showed that the WUE based on biological and economic yields [14.7 and 17.1 kg/（hm^2·mm）] of the second growing season were significantly（P〈0.05） higher than that of the first growing season [12.6 and 14.7 kg/（hm^2·mm）],the WCC based on biological yield and economic yield（679 and 584）of the second growing season were significantly（P〈0.05） lower than that of the first growing season（793 and 682）.This proved that the growing years affected the WUE and WCC.

关 键 词：紫花苜蓿 水分利用效率 耗水系数 生长年限 小型蒸渗仪 北京平原区 

分 类 号：S541.9[农业科学—作物学]