坝上地区紫花苜蓿的需水量、需水强度和作物系数  

The Water Requirement,Water Requirement Rate and Crop Coefficient of Alfalfa in Bashang Area

作　　者：马令法[1] 孙洪仁[2] 魏臻武[3] 李品红[2] 刘爱红[2] 

机构地区：[1]甘肃农业大学草业学院,甘肃兰州730070 [2]中国农业大学草地研究所,北京100094 [3]扬州大学动物科技学院,江苏扬州225009

出　　处：《中国草地学报》2009年第2期116-120,共5页Chinese Journal of Grassland

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"科技支撑项目"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"(ny-hyzx07-022)

摘　　要：采用大型非称重式蒸渗仪法．研究了河北省坝上地区紫花苜蓿的需水量、需水强度和作物系数。结果表明：坝上地区2007年紫花苜蓿第1茬、第2茬和主生长期（1～2茬）需水量分别为499．5mm、213．3mm和712．8mm，第1茬需水量占主生长期需水量的70％，显著高于第2茬（P〈0．05）；需水强度分别为7．7mm／d、3．8mm／d和5．9mm／d，第1茬需水强度显著高于第2茬（P〈0．05）．达其2倍以上。采用Penman-Montcith公式计算参照作物蒸散量，利用需水量测定值和同期参照作物蒸散量计算了紫花苜蓿的作物系数。其第1茬、第2茬和主生长期（1～2茬）作物系数分别为1．61、0．88和1．29．第1茬作物系数明显高于第2茬，接近其2倍。The water requirement（WR） and water requirement rate（WRR） of alfalfa（Medicago sativa L. ） was studied in Bashang area of Hebei province with large scale no-weighting-lysimeter. The reference crop evapotranspiration（ETo） was calculated by the Penman-Monteith formula, and the crop coefficient（Kc） of alfalfa was determined on the measured WR and calculated ETo in the same period. The results showed that the WR of alfalfa during the first harvest,second harvest and main growth period（1st-2nd harvest） in 2007 were 499.5mm,213.3mm and 712.8 mm,separately. The WR of first harvest aceount for 70% of that of the main growth period,and it was higher than that of the second harvest obviously（P〈0.05）. The WRR of alfalfa during the first harvest,second harvest and main growth period（1st-2nd harvest） in 2007 were 7.7mm/d,3.8mm/d and 5.9 mm/d,separately. The WRR of first harvest was higher than that of the second harvest obviously（P〈0.05） ,and it reached more than 2 times of the later. The Kc of alfalfa during the first harvest,second harvest and main growth period（1st-2nd harvest） in 2007 were 1.61,0.88 and 1.29,separately. The Kc of first harvest was higher than that of the second harvest evidently, and it was close 2 times to the later.

关 键 词：紫花苜蓿 需水量 需水强度 作物系数 大型非称重式蒸渗仪 坝上地区 

分 类 号：S541[农业科学—作物学]