不同年龄长柄双花木枝叶氮磷钾生态化学计量特征

Ecological Stoichiometry of N,P and K in Leaves and Branches of Different Aged Disanthus cercidifolius var.longipes

为揭示不同年龄长柄双花木Disanthus cercidifolius var.longipes叶片和枝干元素间的变化规律,以钱江源国家森林公园中的长柄双花木居群为研究对象,采样分析了1、3、5、7年生长柄双花木叶片和枝干中的N、P、K含量,探讨不同年龄植株叶片和枝干的N、P、K生态化学计量特征。结果表明:长柄双花木叶片的N、P、K含量和K∶P均显著大于枝干的(P<0.05);随着年龄的增长,长柄双花木叶片和枝干中的N、P、K含量均表现为下降的趋势;不同年龄长柄双花木叶片和枝干的N∶P介于20.62~27.61,N∶K介于4.07~5.17,K∶P介于4.30~5.79;随年龄的增长,长柄双花木叶片和枝干的N∶P和N∶K均呈现出增大的趋势,K∶P先下降而后升高。综上分析,P元素是影响长柄双花木生长的限制性营养元素,在保护与种植过程中可适当增施P肥。

In August 2021,leaves and branches were collected from 1-,3-,5-,7-year Disanthus cercidifolius var.longipes in Qianjiangyuan National Forest Park in Kaihua county,Zhejiang province.The content of N,P and K in leaves and branches collected was analyzed.The results showed that the content of N,P,K and K:P was leaves>branches.The N,P and K content in leaves and branches had negative relation with age.Of different aged D.cidifolius var.longipes,the values of N:P were 20.62-27.61,of N:K 4.07-5.17,and of K:P,4.30-5.79.N:P and N:K in leaves and branches had positive relation with age,while K:P decreased first and then increased.