坝上地区紫花苜蓿的需水量、需水强度和作物系数(Ⅱ)  

The water requirement,water requirement rate and crop coefficient of alfalfa in Bashang area

作　　者：李品红[1] 孙洪仁[1] 刘爱红[1] 谢勇[1] 孙雅源[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9期124-128,共5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"(nyhyzx07-022)

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Medicago sativa的需水量和需水强度。采用Penman—Monteith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。结果表明:坝上地区2008年紫花苜蓿第1、2、3茬和全生长季(1—3茬)需水量分别为157.8、192.0、199.5和549.3 mm,第1茬显著低于第2和3茬(P<0.05),第2和3茬差异不显著。需水强度分别为2.6、6.2、4.2和3.9 mm/d,第2茬显著高于第1和3茬(P<0.05),第3茬显著高于第1茬(P<0.05)。作物系数分别为0.61、1.34、1.30和0.99,第2和3茬作物系数明显高于第1茬,超过其2倍。The water requirement （WR） and water requirement rate （WRR） of alfalfa （Medicago sativa） were studied in Bashang area of Hebei Province with large scale no-weighting-lysimeter. The reference crop evapo-transpiration（ETo） was calculated by the Penrnan-Monteith formula, and the crop coefficient（Ke）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, third harvest and whole growth season（1st-3rd harvest） in 2008 were 157.8, 192.0, 199.5 and 549.3 turn, separately. The WR of first harvest was lower than that of the second and third harvest significantly（P〈 0.05） ,and the WR of second and third harvest was not significantly different. The WRR were 2.6, 6.2, 4.2 and 3.9 mm/d, separately. The WRR of second harvest was higher than that of the first and third harvest significantly （P〈0.05）, and the WRR of third harvest was higher than that of the first harvest significantly （P〈0.05）. The Kc were 0. 61, 1.34, 1.30 and 0. 99,separately. The Kc of the second and third harvest were higher than that of the first harvest evidently, and they were more than 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：S541.901[农业科学—作物学]