Variation of the water-use efficiency and nutrients of Pinus armandii under different ages and growth season

IF 1.7 3区农林科学 Q2 FORESTRY

Canadian Journal of Forest Research Pub Date : 2023-08-08 DOI:10.1139/cjfr-2023-0078

Yuanxi Liu, Jun-Yan Wu, Danzi Wu, Jiandong Xiao, Jianli Sun, Zhijuan Zhao

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引用次数: 0

Abstract

Seasonal changes in carbon (C), nitrogen (N), and phosphorus (P) stoichiometry and water-use efficiency (WUE) in the needles of Pinus armandii were investigated. The needles of P. armandii were sampled in January, May, August, and November 2021. The results showed that (1) the needle δ13C values of young P. armandii forests were higher than those of middle-aged P. armandii forests, and these differences were significant in winter. (2) Both young and middle-aged P. armandii forests were restricted by N and P, and P. armandii was more restricted by N in summer, autumn, and winter. (3) Needle δ13C values were significantly positively correlated with P and negatively correlated with N, C/P, and N/P in young P. armandii forests; P. armandii (especially young stands) can compensate for decreases in N-use efficiency by increasing WUE. The C, N, and P content and their stoichiometric ratios were affected by a combination of season, stand age, and WUE. This study contributes to an in-depth understanding of the adaptive mechanisms of nutrients and WUE in P. armandii in the subtropical region. Our findings also have implications for the management of P. armandii plantations in the study area.

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不同树龄和生长季节下黑松水分利用效率和养分的变化

研究了华山松针叶中碳、氮、磷化学计量和水分利用效率的季节变化。在2021年1月、5月、8月和11月对阿玛迪P.armandii的针头进行了采样。结果表明：（1）华山松幼林的针叶δ13C值高于华山松中年林，且在冬季差异显著。（2）青壮年华山松林均受到N和P的限制，夏季、秋季和冬季华山松林更受N的限制。（3）针叶δ13C值与P呈正相关，与N、C/P和N/P呈负相关；华山松（尤其是幼林）可以通过提高水分利用效率来弥补氮素利用效率的下降。碳、氮、磷含量及其化学计量比受季节、林分年龄和水分利用效率的影响。本研究有助于深入了解亚热带地区华山松营养物质和水分利用效率的适应机制。我们的研究结果也对研究区域内P.armandii种植园的管理有启示。

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来源期刊

Canadian Journal of Forest Research 农林科学-林学

CiteScore

4.20

自引率

9.10%

发文量

109

审稿时长

3 months

期刊介绍： Published since 1971, the Canadian Journal of Forest Research is a monthly journal that features articles, reviews, notes and concept papers on a broad spectrum of forest sciences, including biometrics, conservation, disturbances, ecology, economics, entomology, genetics, hydrology, management, nutrient cycling, pathology, physiology, remote sensing, silviculture, social sciences, soils, stand dynamics, and wood science, all in relation to the understanding or management of ecosystem services. It also publishes special issues dedicated to a topic of current interest.