Comparison of plant species diversity and composition in the dry valleys of Yalong River and Dadu River: evaluating the effects of climate, topography and space

doi:10.17520/biods.2015300

Abstract

Abstract:

The vegetation of dry valleys is a suit of unique azonal ecosystems embedded in the Hengduan Mountains region of Southwest China, with the difference of plant communities between the valleys and the causal factors still elusive. In this study, we investigated the dry valleys of the Yalong River and the Dadu River and compared plant diversity. Different factors were found to impact the vegetation types between the two rivers. Elevation and topography (slope and aspect) impacted vegetation types of the Yalong River and mean annual precipitation impacted the Dadu River. Plant richness in the valleys of the two rivers decreased with greater mean annual temperature. From a north to south aspect, plant richness of the dry valley communities decreased in the Yalong River, while increased in the Dadu River. Richness of shrubs in both the Yalong River and the Dadu River were greater at increased slopes. The β diversity of plant community in the dry valleys of the Yalong River and the Dadu River was affected more by environmental than geographical distance. The effect of geographical isolation on the two rivers was approximately 5 times greater than the effect of geographical distance. This research fills the knowledge gap about plant diversity of dry valleys vegetation in the Yalong River and the Dadu River, and reference information for vegetation conservation in the dry valleys of the two rivers. In addition, it provides a practical method for the quantitative assessment of geographical isolation effect on regional biodiversity difference.

http://jtp.cnki.net/bilingual/detail/html/SWDY201604007

Key words: dry valley, plant diversity, vegetation types, geographical isolation

Jie Han, Zehao Shen, Songlin Shi, Peihao Peng. Comparison of plant species diversity and composition in the dry valleys of Yalong River and Dadu River: evaluating the effects of climate, topography and space[J]. Biodiv Sci, 2016, 24(4): 421-430.

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URL: https://www.biodiversity-science.net/EN/10.17520/biods.2015300

https://www.biodiversity-science.net/EN/Y2016/V24/I4/421

Figures/Tables 8

References 62

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		年均温 Mean annual temperature	坡向 Aspect	坡度 Slope	河流解释 River explanation	限制性最大似然估计 REML criterion
灌木层 Shrub layer	雅砻江 The Yalong River	-0.202^**	-0.747^**	0.020^*	92.10%	76.1
灌木层 Shrub layer	大渡河 The Dadu River	-0.432^**	1.005^**	0.016^*	92.10%	76.1
草本层 Herb layer	雅砻江 The Yalong River	-0.537^**	-0.687^**	-	92.20%	104.9
草本层 Herb layer	大渡河 The Dadu River	-0.969^**	1.451^**	-	92.20%	104.9

		年均温 Mean annual temperature	坡向 Aspect	坡度 Slope	河流解释 River explanation	限制性最大似然估计 REML criterion
灌木层 Shrub layer	雅砻江 The Yalong River	-0.202^**	-0.747^**	0.020^*	92.10%	76.1
灌木层 Shrub layer	大渡河 The Dadu River	-0.432^**	1.005^**	0.016^*	92.10%	76.1
草本层 Herb layer	雅砻江 The Yalong River	-0.537^**	-0.687^**	-	92.20%	104.9
草本层 Herb layer	大渡河 The Dadu River	-0.969^**	1.451^**	-	92.20%	104.9

群落类型 Community type	河流 River	海拔 Elevation (m)	灌木密度 Shrub density (/100 m²)	草本密度 Herb density (/100 m²)	植被型 Vegetation type
类型A Type A	大渡河 The Dadu River	1,200	9 ± 4	41 ± 10	亚热带针阔叶混交林Coniferous and broadleaved mixed forest in subtropical
类型B Type B	大渡河-雅砻江 The Dadu River-the Yalong River	1,400	3 ± 1	19 ± 3	暖性落叶阔叶灌丛 Warm deciduous broadleaved shrub
类型C Type C	雅砻江 The Yalong River	2,600	4 ± 2	21 ± 4	暖性落叶阔叶灌丛 Warm deciduous broadleaved shrub
类型D Type D	雅砻江 The Yalong River	2,700	6 ± 3	26 ± 6	暖性落叶阔叶灌丛 Warm deciduous broadleaved shrub
类型E Type E	雅砻江 The Yalong River	2,500	4 ± 1	25 ± 7	暖性落叶阔叶灌丛 Warm deciduous broadleaved shrub

群落类型 Community type	河流 River	海拔 Elevation (m)	灌木密度 Shrub density (/100 m²)	草本密度 Herb density (/100 m²)	植被型 Vegetation type
类型A Type A	大渡河 The Dadu River	1,200	9 ± 4	41 ± 10	亚热带针阔叶混交林Coniferous and broadleaved mixed forest in subtropical
类型B Type B	大渡河-雅砻江 The Dadu River-the Yalong River	1,400	3 ± 1	19 ± 3	暖性落叶阔叶灌丛 Warm deciduous broadleaved shrub
类型C Type C	雅砻江 The Yalong River	2,600	4 ± 2	21 ± 4	暖性落叶阔叶灌丛 Warm deciduous broadleaved shrub
类型D Type D	雅砻江 The Yalong River	2,700	6 ± 3	26 ± 6	暖性落叶阔叶灌丛 Warm deciduous broadleaved shrub
类型E Type E	雅砻江 The Yalong River	2,500	4 ± 1	25 ± 7	暖性落叶阔叶灌丛 Warm deciduous broadleaved shrub

距离矩阵 Distance matrices	R	P
环境 Environmental	-0.727	0.001
环境\|地理距离 Environmental \| Geographical distance	-0.543	0.001
环境\|5倍地理距离 Environments \| 5 × Geographical distance	-0.401	0.002
地理距离 Geographical distance	-0.576	0.001
地理距离\|环境 Geographical distance \| Environments	-0.013	0.513
5 ×地理距离\|环境 5 × Geographical distance \| Environments	-0.451	0.001