碱茅草需水量测定  

MEASUREMENT OF WATER REQUIREMENT OF JIANMAO GRASS

作　　者：罗家雄 魏一谦 

机构地区：[1]新疆水利水电研究所,830049 [2]新疆农垦科学院

出　　处：《草业科学》1993年第1期44-48,50,共6页Pratacultural Science

摘　　要：本文介绍在新疆干旱地区用筒测法测定的碱茅草各种需水参数:头茬草总需水量4500—4800m^3/公顷(实际净灌水量2250—3000m^3/公顷),需水模数两头小中间大,需水强度43.5—49.5m^3/公顷/日,需水系数0.5-0.7;二茬草总需水量2400m^3/公顷,需水强度22.5—25.5m^3/公顷/日;叶面蒸腾量占总需水量53%—55%,棵间蒸发量45%—47%,各生育阶段的两者比值0.23—1.73。以上可作为拟定碱茅草灌溉制度的依据。Measuring various water requirement parameters of Jianmao grass(Puccinallia Tenuiflora(Turcz)scrib- net Merr and Puccinallia Chinanipoensis Ohwi)with the method of bobbin measuring in the arid zone of Xinjiang was introduced in this paper:The total water requirement before first cutting of the grass was 4500 --4800m^3/ha(net duty 2250-3000m^3/ha),water requiring rate was small in the two ends of growing period and big in the middle.The intensity of water requirement was 43.5-49.5m^3/ha·d,water requirement factor was 0.5-0.7.The total water requirement for the second cutting of the grass was 2400m^3/ha,intensity of water requirement 22.5-25.5m^3/ha·d.The evapotranspiration amount of the leaf surface accounted for 53%-55% of its total water requirement,evaporation between plants 45%- 47%.The ratio of leaf evapotranspiration over between plants evaporation in each growing period of the grass varied from 0.23 to 1.73,which is a basis for drawing up irrigation procedure of Jianmao grass.

关 键 词：碱茅草 需水量 分析 

分 类 号：S543.901[农业科学—作物学]