紫花苜蓿第1茬地上部干物质生长过程与有效积温的关系  

Relationship between the aboveground dry matter accumulation of alfalfa and the effective accumulated temperature in the first cutting

作　　者：史纪安[1,2] 刘玉华[1,2] 贾志宽[2] 

机构地区：[1]河南科技大学农学院,河南洛阳471003 [2]西北农林科技大学干旱半干旱中心,陕西杨凌712100

出　　处：《草业科学》2009年第8期81-86,共6页Pratacultural Science

基　　金：河南科技大学博士科研启动基金资助项目(09001159);农业部‘948’项目"高产优质高抗逆苜蓿新品种的引进与繁育"(2001-372)

摘　　要：对不同秋眠级数的4年生紫花苜蓿Medicago sativa品种第1茬干物质生长与≥5℃有效积温的研究结果表明：1）不同紫花苜蓿品种各器官干物质生长趋势一致，干物质生产潜力、最大生长速率、干物质生长盛期的平均生长速率均表现为全株〉茎〉叶，但是最大生长速率和平均生长速率所对应的有效积温值范围有差异。全株、茎和叶干物质最大生长速率分别出现在5℃初日后有效积温达504．72～609．45℃、574．47～643．91℃、444．53～543．25℃之时；平均生长速率转折点所对应的有效积温值范围为总干物质为384．61～716．54℃；茎干物质为424．48～773．36℃；叶干物质为320．42～642．48℃。2）不同苜蓿品种闯干物质生长存在差异。半秋眠性品种路宝、牧歌401和美国杂交熊全株、茎、叶的干物质潜力大，最大生长速率较大，生长盛期内的平均生长速率较大，各转折点所对应的有效积温值相对较高．且其迟滞期的有效积温值也相对较高．秋眠性品种超级13R则相反。The results of field experiments on relationship between dry matter yield of the four-year al- falfa in the first cutting and ≥5℃ accumulated temperature indicated that 1） The dry matter growth pattern of different parts of alfalfa varieties was same. The order of the production potential of dry matter, maximum growth rate, average growth rate were whole plant 〉 stem 〉 leaf. But the ranges of the effective accumulated temperature for the maximum growth rate and average growth rate were different. The maximum growth rates of whole plant, stern and leaf were reached while the effective accumulated temperatures were 504.72 to 609.45 ℃, 574.47 to 643.91℃, 444.53 to 543.25℃ respectively. And for the average growth rates, they were 384.61 to 716.54℃, 424.48 to 773.36℃, 320.42 to 642.48℃ ; 2） The dry matter growth of different alfalfa varieties was different. For whole plant, stern and leaf of Lobo, Amerigraze 401 and Meiguozajiao, their potential dry matter growth, maximum growth rates and average growth rates in peak of growing season were higher.

关 键 词：紫花苜蓿 干物质 有效积温 

分 类 号：S541.9[农业科学—作物学]