Latitudinal variability and driving factors of functional diversity in Pinus thunbergiicommunities across sea-islands in Eastern China

doi:10.17521/cjpe.2020.0227

Abstract

Abstract:

Aims The Pinus thunbergii communities is widespread across islands in both Yellow Sea and East China Sea. The objective of this study is to examine the latitudinal pattern of functional diversity and abiotic and biotic drivers of P. thunbergii communities. Our aims are to advance understanding of whether the zonal character of latitude oriented pattern of biodiversity still holds in the same community type across the highly isolated and fragmented landscape.
Methods We investigated community structure and measured plant functional traits across 60 P. thunbergii communities in 27 islands, spanning 13 degree in latitudes of Eastern China. Linear regression was used to analyze the relationships between functional diversity of the P. thunbergii community and each of the biotic factors (the dominance of P. thunbergii and species diversity) and abiotic factors (annual mean temperature, total solar radiation and aridity index). The relative importance of abiotic and biotic factors on the functional diversity of P. thunbergii communities was determined by using the generalized linear model and variance decomposition.
Important findings With the increasing latitude, the dominance of P. thunbergii,species richness, and functional richness, functional dispersion and Rao's quadratic entropy (RaoQ) of stem traits alone and stem and leaf traits in combination decreased significantly but those of leaf traits did not show clear trend, across P. thunbergii communities. The dominance of P. thunbergii, species richness and climatic factors jointly explained 63%, 47% and 39% of variation in each of functional richness, functional dispersion and RaoQ of the combination of leaf and stem traits, and 56%, 67% and 53% of variation in each of functional richness, functional dispersion and RaoQ of stem traits, but small variations in leaf traits (21%-30%). Species richness and Simpson diversity significantly increased but Shannon-Wiener diversity significantly decreased leaf functional richness. Aridity significantly increased functional diversity of stem traits and the combination of leaf and stem traits. Annual mean temperature significantly decreased functional dispersion and RaoQ of wood traits. These results indicate that there is a clear latitudinal pattern of functional diversity in P. thunbergii communities across islands. Climate and species richness play the key roles for shaping the latitudinal variations in functional diversity of P. thunbergii communities across islands in Eastern China.

Key words: Key words, functional dispersion, climatic factor, Rao's quadratic entropy (RaoQ), species diversity, plant functional trait

SHI Jiao-Xing, XU Ming-Shan, FANG Xiao-Chen, ZHENG Li-Ting, ZHANG Yu, BAO Di-Feng, YANG An-Na, YAN En-Rong. Latitudinal variability and driving factors of functional diversity in Pinus thunbergiicommunities across sea-islands in Eastern China[J]. Chin J Plant Ecol, 2021, 45(2): 163-173.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2020.0227

https://www.plant-ecology.com/EN/Y2021/V45/I2/163

Figures/Tables 5

References 37

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区域 Region	海岛 Island	纬度/经度 Latitude/Longitude	样地数 Number of plots	物种丰富度 Species richness	年平均降水量 Mean annual precipitation (mm)	干旱指数 Aridity index	年平均气温 Mean annual air temperature (℃)	总太阳辐射 Total solar radiation (MJ·m^-2·a^-1)
1	北长山岛、南长山岛、庙岛、大黑山岛 Beichangshan island, Nanchangshan island, Miao island, Daheishan island	37.92°-37.99° N/ 120.61°-120.74° E	12	5-10	480-505	1.78-1.88	11.3-11.8	43 566-43 944
2	秦山岛 Qinshan island	34.87° N/119.28° E	2	5-6	913	0.99	13.9	27 158
3	册子岛、大长涂岛、岱山岛、枸杞岛、花鸟岛、盘峙岛、普陀山岛、青浜岛、衢山岛、泗礁岛、外马廊岛、秀山岛、摘箬山岛 Cezi island, Dachangtu island, Daishan island, Gouqi island, Huaniao island, Panzhi island, Putuoshan island, Qingbang island, Qushan island, Sijiao island, Waimalang island, Xiushan island, Zhairuoshan island	29.95°-30.85° N/ 121.93°-122.79° E	28	8-21	981-1 275	0.86-1.12	15.8-16.8	32 469-33 335
4	大屿岛、大嵛岛^、烽火岛、西洋岛^Dayu island, Dayú island^, Fenghuo island, Xiyang island^	26.51°-26.95° N/ 119.93°-120.36° E	10	5-19	1 405-1 523	0.92-0.99	17-18.9	33 784-34 852
5	东庠岛^、海坛岛^、湄洲岛^、南日岛^、屿头岛 Dongxiang island^, Haitan island^, Meizhou island^, Nanri island^, Yutou island	25.06°-25.65° N/ 119.13°-119.88° E	8	7-20	1 116-1 258	1.09-1.25	19.6-20.5	18 036-35 862

区域 Region	海岛 Island	纬度/经度 Latitude/Longitude	样地数 Number of plots	物种丰富度 Species richness	年平均降水量 Mean annual precipitation (mm)	干旱指数 Aridity index	年平均气温 Mean annual air temperature (℃)	总太阳辐射 Total solar radiation (MJ·m^-2·a^-1)
1	北长山岛、南长山岛、庙岛、大黑山岛 Beichangshan island, Nanchangshan island, Miao island, Daheishan island	37.92°-37.99° N/ 120.61°-120.74° E	12	5-10	480-505	1.78-1.88	11.3-11.8	43 566-43 944
2	秦山岛 Qinshan island	34.87° N/119.28° E	2	5-6	913	0.99	13.9	27 158
3	册子岛、大长涂岛、岱山岛、枸杞岛、花鸟岛、盘峙岛、普陀山岛、青浜岛、衢山岛、泗礁岛、外马廊岛、秀山岛、摘箬山岛 Cezi island, Dachangtu island, Daishan island, Gouqi island, Huaniao island, Panzhi island, Putuoshan island, Qingbang island, Qushan island, Sijiao island, Waimalang island, Xiushan island, Zhairuoshan island	29.95°-30.85° N/ 121.93°-122.79° E	28	8-21	981-1 275	0.86-1.12	15.8-16.8	32 469-33 335
4	大屿岛、大嵛岛^、烽火岛、西洋岛^Dayu island, Dayú island^, Fenghuo island, Xiyang island^	26.51°-26.95° N/ 119.93°-120.36° E	10	5-19	1 405-1 523	0.92-0.99	17-18.9	33 784-34 852
5	东庠岛^、海坛岛^、湄洲岛^、南日岛^、屿头岛 Dongxiang island^, Haitan island^, Meizhou island^, Nanri island^, Yutou island	25.06°-25.65° N/ 119.13°-119.88° E	8	7-20	1 116-1 258	1.09-1.25	19.6-20.5	18 036-35 862