不同年龄长柄双花木枝叶氮磷钾生态化学计量特征

周世水; 沈汉; 郑成忠; 余雪琴; 姜年春; 吴家森

doi:10.3969/j.issn.1001-3776.2022.02.005

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

摘要

摘要: 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。

Abstract: 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.

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