Seasonal Dynamics of N,P,and K Stoichiometry in Twigs and Needles of Pinus dabeshanensis,An Endangered Gymnosperm Species

doi:10.7525/j.issn.1673-5102.2021.03.010

Abstract

Abstract:

In order to understand the nutrient status and seasonal variations in the twigs and needles of Pinus dabeshanensis，a rare and endangered plant in China，the dynamics of N，P and K contents and their stoichiometric ratios in twigs and needles，and the differences between organs were explored， the field sampling and N，P，K analyses in laboratory were carried out in 12 consecutive months. The results showed that organ and month represented significant influences on the stoichiometric characteristics of P.dabeshanensis，and the organ showed the greatest influence. The seasonal changes of stoichiometric characteristics in twigs were irregular； the N∶K showed the greatest variation（the variation coefficients for twig and needle were 26.75% and 28.00%，respectively） and the rest stoichiometric indices belonged to weak variation （variation coefficients <25%）. The average contents of N，P and K in needles（10.40，1.43 and 5.15 mg·g^-1，respectively） showed significantly higher than that in twigs（6.56，1.26 and 4.80 mg·g^-1，respectively），and the mean N∶P in needles（7.27） was also significantly higher than that in twigs（5.18）. However，both of the two N∶P ratios were far lower than 14，showed a serious N-limitation. The N∶P，N∶K and P∶K ratios were dominated by N，K，and K，respectively，in both needles and twigs（i.e.，the highest correlation coefficients were observed between them）. Significant allometric scaling relationships were detected among N，P，and K in both needles and twigs（except for N-K in twigs）； the partitioning rate of needle N was higher than that of twigs，while the partitioning rate of P was lower than that of twigs. The precipitation and temperature showed different influences on stoichiometric characteristics in twigs and needles. The precipitation presented significantly obvious temporal-scale effect. The short temporal-scale precipitation mostly affected needles，while the long temporal-scale precipitation mostly affected twigs. At all temporal-scales，temperature was negatively correlated with P content in needles，but positively correlated with K content in twigs. As a whole，there were significant differences in the stoichiometric characteristics between needles and twigs of P.dabeshanensis，and they exhibited obvious seasonal variation，and were affected by precipitation and temperature to some extent.

Key words: Pinus dabeshanensis, twig, needle, seasonal change, stoichiometric characteristic, meteorological factor

CLC Number:

S791.24

Jing-Ming YAN, Shi-Hang ZHANG, Man WANG, Wei HANG, Shen QIAN, Dong QIU, Ye TAO. Seasonal Dynamics of N,P,and K Stoichiometry in Twigs and Needles of Pinus dabeshanensis,An Endangered Gymnosperm Species[J]. Bulletin of Botanical Research, 2021, 41(3): 395-407.

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