蓖麻干物质积累和分配规律的研究

蓖麻生育期内各器官干物质积累模型属Logistic函数的有根、茎,叶(出苗至出苗后75天)、营养体、蒴果、籽粒、生殖体和全株。函数曲线呈“S”型。其干物质积累强度的变化为“慢—快—慢”式,其分配率变化特点是:生育初期干物质主要分配于营养体;出苗60天后,生殖体的生长开始占优势,至出苗72天左右其分配率达最大值,之后呈下降趋势,且以蒴壳等下降显著;而营养体的分配率却出现了回升现象,且以茎叶回升明显。

STUDIES ON DRY MATTER ACCUMULATION AND DISTRIBUTION IN CASTOR

The accumulation dynamies of dry matter in root,stem,leaf,vegetative mass,capsule ,seed,reproductive mass and plant in castor were studied during growing period and shown to agree with Logistic function Intensity of dry matter accumulation shown a "S" form with "slow-fast-slow".The distribution was mainly in vegetative mass at the first period of growing stage.The superiority of reproductive mass occurred at 60 days after emergence and reached the maximum about 72 days,and then shown a decreasing trend.And the rate of the distribution in the vegetative mass shown a increasing trend and more obvious in leaf and stem than others.