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

Abstract

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

CLC Number:

S718.43

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.

Figures/Tables 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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Effects of Neighborhood Tree Species Diversity on the Stoichiometric Ratios of Nitrogen to Potassium, Calcium, and Magnesium in Cunninghamia lanceolata leaves

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