邻体树种多样性对杉木叶片氮与钾、钙、镁计量比的影响

doi:10.11707/j.1001-7488.LYKX20220801

摘要/Abstract

摘要：

目的: 探讨亚热带森林生态系统中邻体树种多样性对元素计量比的影响，以期为亚热带地区造林树种的选择提供养分利用效率的科学依据。方法: 基于大型野外树种多样性与生态系统功能实验平台，选取具有不同树种丰富度（1、4、8、16、32）的样地，以杉木为研究对象，在每块样地中心区域，选取8株目标树，测定其叶片氮（N）、钾（K）、钙（Ca）和镁（Mg）等养分含量，并计算其与邻体树之间功能性状差异。采用线性混合效应模型，分析邻体树种丰富度、树种间功能性状差异以及邻体树高指数对目标树叶片氮与钾、钙、镁化学计量比的影响。结果: 1）杉木与邻体树之间的比叶面积不相似性显著降低了杉木叶片氮钾比（N∶K）和氮镁比（N∶Mg），但不影响杉木叶片氮钙比（N∶Ca）；2）邻体树种丰富度增加，且提高了杉木叶片氮镁比（N∶Mg）；3）邻体树高指数（遮荫程度）显著降低了杉木叶片氮钙比（N∶Ca）。随着遮阴程度的增加，杉木和邻体树之间根组织密度的不相似性对杉木叶片N∶Ca的影响由正效应逐渐转为负效应。结论: 在亚热带地区营造混交林有利于提高树木邻体树种功能性状差异，促进钙、镁、钾等养分资源的利用，改善树木的养分平衡状况。

关键词: 树种丰富度, 功能性状, 树高指数, 生态位互补

Abstract:

Objective: This study aims to explore the impact of neighboring tree species diversity on element stoichiometry in subtropical forest ecosystems, in order to provide scientific basis for nutrient utilization efficiency in the selection of afforestation tree species in subtropical regions. Method: Based on tree diversity and a large-scale ecosystem function experimental platform, plots with different tree species richness (1, 4, 8, 16, 32) were selected, with Chinese fir (Cunninghamia lanceolata) as the target tree species, and 8 target trees were selected in the central area of each plot. The nutrient concentration of nitrogen (N), potassium (K), calcium (Ca) and magnesium (Mg) in leaves were measured, and the dissimilarities of functional traits between its neighbors were calculated. Linear mixed-effect models were used to study the effects of neighbor tree species richness, functional trait dissimilarities among tree species, and neighbor tree height index on the stoichiometric ratios of N∶K, N∶Ca and N∶Mg in target tree leaves. Result: 1) High dissimilarities in specific leaf areas between the target tree and its neighbor trees significantly reduced the ratios of N∶K and N∶Mg of the target tree's leaves, but did not affect the N∶Ca. 2) The species richness of neighbor trees increased N∶Mg of the leaves of the target trees. 3) The neighbor tree height index (shading effect) significantly reduced the N∶Ca ratio of the target tree leaves. As the shading increased, the effect of dissimilarity in root tissue density between Chinese fir and neighboring trees on the N∶Ca ratio in Chinese fir leaves shifted from positive to negative. Conclusion: Establishment of mixed forests in subtropical regions is beneficial for increasing the functional trait dissimilarities between neighboring tree species, enhancing the utilization of calcium, magnesium, and potassium nutrient resources, and improving the nutrient balance of Chinese fir.

Key words: tree species richness, functional trait, height index, niche complementarity

中图分类号:

S718.43

笪明慧,冉松松,傅彦榕,邹秉章,王思荣,万晓华,余再鹏,黄志群. 邻体树种多样性对杉木叶片氮与钾、钙、镁计量比的影响[J]. 林业科学, 2024, 60(6): 37-43.

Minghui Da,Songsong Ran,Yanrong Fu,Bingzhang Zou,Sirong Wang,Xiaohua Wan,Zaipeng Yu,Zhiqun Huang. Effects of Neighborhood Tree Species Diversity on the Stoichiometric Ratios of Nitrogen to Potassium, Calcium, and Magnesium in Cunninghamia lanceolata leaves[J]. Scientia Silvae Sinicae, 2024, 60(6): 37-43.

图/表 5

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变量 Variable		系数 Estimate	标准误 SE	自由度 df	t值 t value	P值 P value	R²m	R²c
叶片氮钾比	Intercept	0.50	0.04	31.28	12.33	< 0.001	0.04	0.37
Foliar N∶K	SLA_diss	?0.08	0.03	117.90	?2.50	0.013
叶片氮钙比	Intercept	1.62	0.06	31.72	25.83	< 0.001	0.07	0.53
Foliar N∶Ca	NHI	?0.10	0.03	247.16	?4.06	< 0.001
	RTD_diss	?0.02	0.04	164.38	?0.59	0.553
	NHI x RTD_diss	?0.08	0.03	247.60	?2.68	0.008
叶片氮镁比	Intercept	2.66	0.04	37.91	64.49	< 0.001	0.09	0.39
Foliar N∶Mg	DIA	0.07	0.02	259.32	3.35	0.001
	NSR	0.08	0.04	195.08	2.12	0.035
	SLA_diss	?0.09	0.03	244.45	?2.63	0.009
	NSR x SLA_diss	?0.04	0.02	130.10	?1.58	0.117

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