Impact of canopy vertical height on leaf functional traits in a lower subtropical evergreen broad-leaved forest of Dinghushan

doi:10.17520/biods.2021414

Abstract

Abstract:

Aims: Plant functional traits, which reflect the adaptation mechanisms of plants to their environment, are important for ecosystem function. Leaves are the main photosynthetic organs of plants and the primary research object of functional traits. However, there are few studies about the variation of leaf functional traits with the increase of canopy vertical height. Taking a lower subtropical evergreen broad-leaved forest of Dinghushan as example, our study aims to detect the changes of leaf functional traits with the canopy vertical height, and explore the influence of canopy vertical height on leaf functional traits.

Methods: Six dominant species from a subtropical evergreen broad-leaved forest in the Dinghushan National Nature Reserve and a total of 10 leaf functional traits of these species at different canopy heights were compared and analyzed in this study. Leaf functional traits include specific leaf area (SLA), chlorophyll relative content (SPAD), leaf dry matter content (LDMC), leaf carbon content (LCC), leaf nitrogen content (LNC), leaf phosphorus content (LPC), leaf N : P (N : P), equivalent water thickness (EWT), nitrogen balance index (NBI), and flavonoids content (FLAV).

Results: The results revealed that: (1) With the increase of canopy vertical height, LDMC, FLAV, EWT, and LPC exhibited an increasing trend, while SLA and NBI exhibited a decreasing trend. There was a significant correlation between leaf traits and vertical height, as exemplified by FLAV and NBI, SLA and EWT with a negative correlation, while LNC and LPC were positively correlated. (2) Leaf traits showed significant discrepancy among different tree species, which might be affected by the plant’s own characteristics and the succession process of species in the community. (3) The intraspecific variation of leaf traits demonstrated different trends along vertical layers. With the increase of canopy vertical height, 67% of species displayed a significant increase in FLAV, while the NBI of 67% of species decreased significantly.

Conclusion: The variation of leaf traits with the increase of canopy vertical height in the subtropical evergreen broad-leaved forest reflects the adaptation of plants to the light environment and the utilization of water resources and energy.

Key words: Dinghushan tower crane plot, plant functional traits, dominant plants, vertical structure, species coexistence

Tian Luo, Fangyuan Yu, Juyu Lian, Junjie Wang, Jian Shen, Zhifeng Wu, Wanhui Ye. Impact of canopy vertical height on leaf functional traits in a lower subtropical evergreen broad-leaved forest of Dinghushan[J]. Biodiv Sci, 2022, 30(5): 21414.

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URL: https://www.biodiversity-science.net/EN/10.17520/biods.2021414

https://www.biodiversity-science.net/EN/Y2022/V30/I5/21414

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性状 Leaf trait	下层 Lower				中层 Middle				上层 Upper
性状 Leaf trait	最小值Min.	最大值Max.	平均值Mean	标准差SD	最小值Min.	最大值Max.	平均值Mean	标准差SD	最小值Min.	最大值Max.	平均值Mean	标准差SD
LDMC (mg/g)	207.47	560.79	440.17	49.24	369.02	548.13	444.40	41.52	357.96	544.94	453.99	47.63
SPAD	33.40	63.30	50.30	6.26	36.20	62.70	52.35	5.19	41.30	65.30	50.92	4.58
FLAV	0.93	3.98	2.08	0.76	0.72	3.90	2.35	0.80	1.07	4.11	2.69	0.93
NBI	9.64	56.28	25.85	10.14	9.64	57.40	24.38	9.86	10.80	51.61	20.96	8.99
SLA (cm²/g)	26.80	158.77	55.95	22.53	26.61	248.98	52.18	26.84	21.38	102.43	45.32	14.93
EWT (cm)	0.0095	0.0425	0.0256	0.0079	0.0051	0.0558	0.0271	0.0079	0.0126	0.0516	0.0289	0.0075
LCC (g/kg)	433.97	525.13	478.66	20.43	445.93	534.07	485.12	18.84	444.23	525.92	484.13	19.30
LNC (g/kg)	11.05	21.46	15.90	2.37	11.05	24.25	16.40	2.18	12.30	22.44	16.27	2.22
LPC (g/kg)	0.49	2.01	0.80	0.22	0.47	1.43	0.82	0.20	0.48	1.45	0.84	0.22
N : P	6.92	33.27	20.89	4.74	11.12	31.39	20.91	4.53	12.02	28.06	20.32	4.04

性状 Leaf trait	下层 Lower				中层 Middle				上层 Upper
性状 Leaf trait	最小值Min.	最大值Max.	平均值Mean	标准差SD	最小值Min.	最大值Max.	平均值Mean	标准差SD	最小值Min.	最大值Max.	平均值Mean	标准差SD
LDMC (mg/g)	207.47	560.79	440.17	49.24	369.02	548.13	444.40	41.52	357.96	544.94	453.99	47.63
SPAD	33.40	63.30	50.30	6.26	36.20	62.70	52.35	5.19	41.30	65.30	50.92	4.58
FLAV	0.93	3.98	2.08	0.76	0.72	3.90	2.35	0.80	1.07	4.11	2.69	0.93
NBI	9.64	56.28	25.85	10.14	9.64	57.40	24.38	9.86	10.80	51.61	20.96	8.99
SLA (cm²/g)	26.80	158.77	55.95	22.53	26.61	248.98	52.18	26.84	21.38	102.43	45.32	14.93
EWT (cm)	0.0095	0.0425	0.0256	0.0079	0.0051	0.0558	0.0271	0.0079	0.0126	0.0516	0.0289	0.0075
LCC (g/kg)	433.97	525.13	478.66	20.43	445.93	534.07	485.12	18.84	444.23	525.92	484.13	19.30
LNC (g/kg)	11.05	21.46	15.90	2.37	11.05	24.25	16.40	2.18	12.30	22.44	16.27	2.22
LPC (g/kg)	0.49	2.01	0.80	0.22	0.47	1.43	0.82	0.20	0.48	1.45	0.84	0.22
N : P	6.92	33.27	20.89	4.74	11.12	31.39	20.91	4.53	12.02	28.06	20.32	4.04