福建三明格氏栲和杉木叶片养分季节动态及再吸收特征

doi:10.16036/j.issn.1000-2650.2019.03.013

摘要/Abstract

摘要： 【目的】理解格氏栲和杉木叶片养分季节动态及其再吸收机制。【方法】以福建三明格氏栲和杉木人工林为研究对象,通过测定叶片中N、P、K、Ca、Mg等5种大量养分元素含量,分析叶片养分含量及其再吸收率的季节动态。【结果】①格氏栲和杉木成熟叶片中养分元素季节动态基本一致,N、Mg含量呈现出先降低后升高的趋势,在生长旺季最低,而P含量为旺季最高,Ca含量均为冬季最低,K含量没有表现出一致的规律,总体来看元素含量顺序为：N>K>Mg>Ca>P。②格氏栲和杉木叶片中N、P、K、Mg都有一定程度的回收,其中杉木叶片的养分回收率更高,不同养分元素再吸收率大小排序为：RE_K>RE_P>RE_N>RE_Mg,不同季节间养分再吸收率差异不显著。③格氏栲和杉木衰老叶片养分含量与再吸收率均呈负相关,说明养分转移度越高,养分再吸收率越大。【结论】杉木更能适应相对贫瘠的环境,格氏栲和杉木叶片养分再吸收率无明显的季节动态。

关键词: 人工林, 叶片养分元素, 季节动态, 再吸收率

Abstract: 【Objective】 The seasonal dynamics and resorption mechanism of nutrients in the leaves of Castanopsis kawakamii and Cunninghamia lanceolata were identified. 【Method】 The seasonal dynamics of leaf nutrient concentrations and resorptions were analyzed by measuring the concentrations of five nutrient elements such as N, P, K, Ca and Mg in the leaves of C. kawakamii and C. lanceolata plantations in Sanming, Fujian province. 【Result】 ①We found that C. kawakamii and C. lanceolata exhibited similar seasonal patterns of mature leaves. In each species,we observed the contents of N and Mg increased at first and then increased, which was the lowest in the growing season, while the content of P was the highest in the growing season and the content of Ca was the lowest in winter. The content of K did not show a consistent pattern. Overall, the order of contents was: N>K>Mg>Ca>P.②The nutrient resorption efficiencies of foliar N, P, K and Mg were higher in C. lanceolata than C. kawakamii, Nutrient resorption efficiency was in the order of RE_K>RE_P>RE_N>RE_Mg. There was no significant difference in nutrient resorptions between different seasons. ③There was a negative correlation between nutrient content and resorption rate in senescent leaves of C. kawakamii and C. lanceolata, indicating that the higher the nutrient transfer degree, the greater the nutrient resorption rate. 【Conclusion】 C. lanceolata can adapt to the relatively poor environment, and the nutrient resorption rate of leaves of C. kawakamii and C. lanceolata has no obvious seasonal dynamics.

Key words: plantation, leaf nutrient elements, seasonal dynamics, nutrient resorption efficiency

中图分类号:

S718.554.2

孟庆权, 葛露露, 王俊, 杨馨邈, 林宇, 何宗明, 胡欢甜, 邱岭军. 福建三明格氏栲和杉木叶片养分季节动态及再吸收特征[J]. 四川农业大学学报, 2019, 37(03): 366-373.

MENG Qingquan, GE Lulu, WANG Jun, YANG Xinmiao, LIN Yu, HE Zongming, HU Huantian, QIU Lingjun. Seasonal Dynamics on Nutrient Concentrations and Resorptions in the Leaves of Castanopsis kawakamii and Cunninghamia lanceolata, in Sanming, Fujian Province[J]. Journal of Sichuan Agricultural University, 2019, 37(03): 366-373.

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