Spatio-temporal dynamics of leaf litter in a karst seasonal rainforest in southwest Guangxi

doi:10.17520/biods.2019403

Abstract

Abstract:

Leaf litter production is a major contributor to ecosystem net primary productivity and biogeochemical cycles. However, various abiotic and biotic drivers inﬂuence leaf litter production in heterogeneous natural forests. In this study, we quantified leaf litter production, composition, and spatio-temporal dynamics in a 15 ha forest dynamics plot in Nonggang National Nature Reserve, Guangxi. We set up 90 litter fall traps and collected leaf litter weekly beginning in May 2012. We explored the spatial and temporal dynamics of leaf litter production in order to gain an in-depth understanding of the material circulation process of forest ecosystem in this region. Ecological factors had significant influence on the inter-annual dynamics of leaf litter volume and explained 69.3% of the cumulative deviation. The effect of altitude on leaf litter was the strongest, explaining 46.5% of the deviation. However, biological factors, such as the coefficient of variation of DBH, the sum of stand basal area per unit area, and species-richness, had smaller effect sizes on annual leaf litter production. Years of continuous monitoring show that there are obvious differences in the leaf litter production between years in karst seasonal rainforests, but abiotic factors, such as altitude, heavily influence leaf litter production.

Key words: karst seasonal rainforests, leaf litter production, annual difference, rhythmicity, ecological factors

Mengke Jia,Yili Guo,Dongxing Li,Bin Wang,Wusheng Xiang,Ailong Wang,Shengyuan Liu,Tao Ding,Fuzhao Huang,Shujun Wen,Shuhua Lu,Xiankun Li. Spatio-temporal dynamics of leaf litter in a karst seasonal rainforest in southwest Guangxi[J]. Biodiv Sci, 2020, 28(4): 455-462.

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URL: https://www.biodiversity-science.net/EN/10.17520/biods.2019403

https://www.biodiversity-science.net/EN/Y2020/V28/I4/455

Figures/Tables 7

References 35

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	2013	2014	2015	2016	2017	2018	平均值 Mean
海拔 Elevation	0.578^**	0.670^**	0.644^**	0.394^**	0.491^**	0.697^**	0.682^**
坡度 Slope	0.447^**	0.400^**	0.421^**	0.422^**	0.314^**	0.255^*	0.411^**
凹凸度 Convexity	0.276^**	0.223^*	0.302^**	0.286^**	0.238^*	0.139	0.262^*
坡向 Aspect	0.141	0.296^**	0.095	0.01	0.046	0.222^*	0.172
岩石裸露率 Rock-bareness rate	0.183^*	0.223^*	0.192^*	0.289^**	0.268^**	0.334^**	0.255^**
湿润度指数 Topographic wetness index	-0.461^**	-0.494^**	-0.509^**	-0.446^**	-0.400^**	-0.363^**	-0.497^**
干旱度指数 Altitude above channel	0.2	0.264^*	0.324^**	0.220^*	0.343^**	0.294^**	0.316^**
胸径变异系数 DBH variation	-0.281^**	-0.352^**	-0.284^**	-0.137	-0.114	-0.326^**	-0.299^**
胸高断面积之和 Total basal area	0.229^**	0.218^**	0.229^**	0.243^*	0.145^*	0.196^*	0.234^**
物种丰富度 Species richness	0.089	0.112	0.091	0.132	0.103	0.078	0.097

	2013	2014	2015	2016	2017	2018	平均值 Mean
海拔 Elevation	0.578^**	0.670^**	0.644^**	0.394^**	0.491^**	0.697^**	0.682^**
坡度 Slope	0.447^**	0.400^**	0.421^**	0.422^**	0.314^**	0.255^*	0.411^**
凹凸度 Convexity	0.276^**	0.223^*	0.302^**	0.286^**	0.238^*	0.139	0.262^*
坡向 Aspect	0.141	0.296^**	0.095	0.01	0.046	0.222^*	0.172
岩石裸露率 Rock-bareness rate	0.183^*	0.223^*	0.192^*	0.289^**	0.268^**	0.334^**	0.255^**
湿润度指数 Topographic wetness index	-0.461^**	-0.494^**	-0.509^**	-0.446^**	-0.400^**	-0.363^**	-0.497^**
干旱度指数 Altitude above channel	0.2	0.264^*	0.324^**	0.220^*	0.343^**	0.294^**	0.316^**
胸径变异系数 DBH variation	-0.281^**	-0.352^**	-0.284^**	-0.137	-0.114	-0.326^**	-0.299^**
胸高断面积之和 Total basal area	0.229^**	0.218^**	0.229^**	0.243^*	0.145^*	0.196^*	0.234^**
物种丰富度 Species richness	0.089	0.112	0.091	0.132	0.103	0.078	0.097

模型因子 Environmental parameters	r²_adj	累计解释率 Cumulative explained deviation (%)	AIC	贡献拟合值 Fitted contribution values	卡方检验 P_r(χ)
海拔 Elevation	0.425	46.5	116.366	9.344	0.000
坡度 Slope	0.256	29.1	1,137.742	6.254	0.000
凹凸度 Convexity	0.210	25.9	1,144.322	4.041	0.001
坡向 Aspect	0.114	16.7	1,154.586	2.161	0.056
岩石裸露率 Rock-bareness rate	0.171	22.8	1,149.297	2.848	0.008
湿润度指数 Topographic wetness index	0.257	27.2	1,135.356	13.75	0.000
干旱度指数 Altitude above channel	0.071	8.15	1,154.644	7.809	0.006
胸径变异系数 DBH variation	0.042	5.32	1,157.379	4.943	0.029
胸高断面积之和 Total basal area	0.162	22.9	1,151.089	2.598	0.015
物种丰富度 Species richness	0.044	7.87	1,159.372	1.437	0.229

模型因子 Environmental parameters	r²_adj	累计解释率 Cumulative explained deviation (%)	AIC	贡献拟合值 Fitted contribution values	卡方检验 P_r(χ)
海拔 Elevation	0.425	46.5	116.366	9.344	0.000
坡度 Slope	0.256	29.1	1,137.742	6.254	0.000
凹凸度 Convexity	0.210	25.9	1,144.322	4.041	0.001
坡向 Aspect	0.114	16.7	1,154.586	2.161	0.056
岩石裸露率 Rock-bareness rate	0.171	22.8	1,149.297	2.848	0.008
湿润度指数 Topographic wetness index	0.257	27.2	1,135.356	13.75	0.000
干旱度指数 Altitude above channel	0.071	8.15	1,154.644	7.809	0.006
胸径变异系数 DBH variation	0.042	5.32	1,157.379	4.943	0.029
胸高断面积之和 Total basal area	0.162	22.9	1,151.089	2.598	0.015
物种丰富度 Species richness	0.044	7.87	1,159.372	1.437	0.229

模型因子 Environmental parameters	r²_adj	累计解释率 Cumulative explained deviation (%)	AIC	贡献拟合值 Fitted contribution values	卡方检验 P_r(χ)
海拔 Elevation	0.425	46.5	1,116.366	6.108	0.000
坡度 Slope	0.458	49.2	1,110.539	0.025	0.874
凹凸度 Convexity	0.513	57.7	1,106.171	1.289	0.260
坡向 Aspect	0.525	58.9	1,104.41	2.215	0.033
岩石裸露率 Rock-bareness rate	0.596	67.5	1,093.937	2.631	0.109
湿润度指数 Topographic wetness index	0.602	69.3	1,094.793	0.887	0.349
干旱度指数 Altitude above channel	0.593	68.1	1,095.75	0.821	0.368
胸径变异系数 DBH variation	0.591	68.4	1,096.955	0.002	0.963
胸高断面积之和 Total basal area	0.594	69.1	1,097.032	1.312	0.256