几种栽培豆科牧草生物量与结构的研究——兼论Ladino白三叶的栽培密度

牧草生物学特性差异导致牧草生物量和结构的差异，结构的差异表现出品种间对时空的利用各不相同。Ｌａｄｉｎｏ白三叶（Ｔｒｉｆｏｌｉｕｍｒｅｐｅｎｓ）密度试验，其生物量表现出株行距小的窄行定植ａ大于株行距大的窄行定植ｃ，中行定植ｃ的生物量介于二者之间，同密度试验的雅安白三叶（Ｔ．ｒｅｐｅｎｓ），其生物量和抗草害的能力较低。１８０天的不同物候期的盖度与密度的大小为正相关。且经三年的盆栽封闭性试验得以证实。几种豆科牧草地上部的倒“”字结构和地下部的半“Ｔ”字型结构中：无性繁殖的Ｌａｄｉｎｏ白三叶生物量大于雅安白三叶；种子直播的金花菜（Ｍｅｄｉｃａｇｏｈｉｓｐｉｄａ）、紫云英（Ａｓｔｒａｇａｌｕｓｓｉｎｉｃｕｓ）和苕子（Ｖｉｃｉａｃｏｒａｃｃａ）与两种白三叶都分别表现出地下部０～１０ｃｍ与０～４０ｃｍ的根产量关系为正相关

STUDY ON BIOMASSES AND STRUCTURES OF SEVERAL CULTIVATED LEGUMES——CONCURRENT ANALYSIS OF PLANTING DENSITY OF LADINO WHITE CLOVER

The biological variation characterized by forage plant species was indicated in the differences of those forage biomasses and their various plant sturctures that displaying the different usages of time and space by respective plant species. The results obtained from the density experiment had been shown that the white colver biomass with narrow drilling belt was the highest in all of the three densities in the treatment, while the wide drilling belt planting treatment went on the other way around, being the lowest. The biomass yield and weed tolerance of the Ya′an white clover was then lower than those of cv. Ladino. The pop ulation coverage was positvely related to the density at each and every stages, which had been demonstrated by pot experiment during three years since trial. The biomass strucures of all the tested legume species were presented as ‘ ’ and ‘T’ pattern on aboveground & within underground Astragalus sinicus and Vicia cracca all sown by seed in the depth of soil layer 0～10cm was positively correlated to that of 0～40 cm.