作　　者： ; ; ; ; (李方平）;

机构地区： 北京林业大学生物科学与技术学院林木花卉遗传育种教育部重点实验室

出　　处： 《北京林业大学学报》 2009年第3期37-41,共5页

摘　　要： 为了掌握四倍体刺槐根龄与生物量和叶片营养含量之间的变化规律,更好地指导实际生产,分别测定了四倍体刺槐不同根龄的生物量及叶片的营养含量。结果表明:四倍体刺槐不同根龄中当年生植株的株高、地径、茎叶比、总重和叶重均随根龄的增长而增加,3年根当年茎的总重和叶重分别达1 138和637 g;不同树龄的株高、总重、叶重和茎叶比也随着树龄的增长而增加,3年生树龄的总重为2 230 g,远高于3年根当年茎,但其叶重仅为603 g,稍低于3年根当年茎;当年生植株的叶片粗蛋白含量高达225.45 g/kg,极显著高于2年根当年茎、3年根当年茎、4年根3年茎和5年根4年茎(P<0.01),而后4个根龄之间叶片粗蛋白含量则无显著差异(P>0.05),且叶片粗蛋白含量均高于178.75 g/kg;根龄对钙含量的影响达到极显著水平(P<0.01),并且钙含量有随着根龄的增长而增加的趋势;不同根龄对四倍体刺槐叶片的粗脂肪、粗灰分、磷和单宁含量影响均不显著(P>0.05)。从生物量和营养综合考虑,四倍体刺槐饲料林定植当年不刈割,第2年开始刈割,进行矮林作业较好。 This study was conducted to assess the impact of root age on biomass and leaf nutrition in tetraploid Robinia pseudoacacia. Results indicated that plant height, base diameter, branch/leaf, gross weight and leaf weight of new sprout increased with root age. The total gross and leaf weight of the 3-year-old plant was 1 138 and 637 g at root age 3, respectively. The plant height, branch/leaf, gross weight and leaf weight increased with tree age, and the gross weight, which amounted to 2 230 g at tree age 3, was significantly higher than that of new sprouts with a root age of 3. But the leaf weight of the 3-year-old tree was only 603 g, lower than that of new sprouts with root age 3. In addition,the amount of crude protein in leaves of new sprout was 225.45 g/kg, which was significantly larger than those of new sprout in 2 years root age, new sprout in 3 years root age, threeyear-stem in 4 years root age and four-year-stem in 5 years root age （P 〈 0.01 ）. However, there were no significant differences among new sprout with a root age of 2, new sprout with root age 3, three-year-stem with root age 4 and four-year-stem in 5 years root age （ P 〉 0.05）. However, leaf crude protein of these plants was higher than 178.75 g/kg. The amount of Ca in leaves was significantly affected by root age （ P 〈 0.01） ,and increased with root age. The amount of ether extract, crude ash, P and tannin in leaves was not significantly affected by root age （ P 〉 0.05）. Overall, the data show that tetraploid R. pseudoacacia forage forest should be cut at age 2 and develop cultivated coppice to maximize biomass and plant nutrition.

关 键 词： 四倍体刺槐 叶片营养 根龄 树龄

领　　域： [农业科学] [农业科学]