Trade-off relationship between vein density and vein diameter of Achnatherum splendens in response to habitat changes in Zhangye wetland

doi:10.17521/cjpe.2016.0316

Abstract

Abstract:

Aims The coevolution between vein traits has influences on water use strategies of plant and the formation of leaf economic spectrum, and therefore is important for understanding the trade-off between carbon input in leaf vein construction and the functional feedback from leaf veins. Our aim is to study the allometric relationship between vein density and vein diameter of Achnatherum splendens populations at three natural microhabitats (subcanopy, transitional and open areas) in Zhangye wetland. Methods According to the shade condition of the arbor canopy and the distance to arbor, the A. splendens community were divided into three microenvironments: subcanopy, transitional and open areas. We sampled 10 (4 m × 4 m) A. splendens plots from each microenvironment and investigate the biological characteristics of the plots and leaf traits of the plants within the plots. Then the soil physical and chemical properties, and community photosynthetically active radiation (PAR) were investigated at three gradients. Six individual of A. splendens were selected in each plot and the leaf length, leaf width, vein density and vein diameter of two or three healthy and complete leaves from four directions of each individual were measured in laboratory. The SMA estimation method and correlation analysis were then used to examine the allometric relationship between vein density and vein diameter. Important findings Along the gradient from subcanopy, transitional zone to open areas, soil moisture displayed a pattern of initial decrease of plant community, and soil electric conductivity displayed increase changing trends. Photosynthetically active radiation (PAR), vapor pressure deficit (VPD), vein density (1.28-1.59 mm·mm^-2), leaf width and water use efficiency (WUE) increase gradually, while the leaf length, vein diameter (0.21-0.16 mm) of A. splendens decrease. The average value of plasticity indexes of leaf characteristics was 0.19. Leaf net photosynthetic rate (P_n), transpiration rate (T_r) and bundle density increase first and them decrease. The vein density and vein diameter of A. splendens were negatively correlated with each other in subcanopy environment (p < 0.01), transitional and open areas (p < 0.05). The SMA (0.54-1.50) slope of regression equation in the scaling relationships between vein density and vein diameter decrease gradually from subcanopy to open areas.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201708006

Key words: Achnatherum splendens, light, vein density, vein diameter, trade-off, Zhangye wetland

Ling HAN, Cheng-Zhang ZHAO, Wei FENG, Ting XU, Hui-Ling ZHENG, Bei-Bei DUAN. Trade-off relationship between vein density and vein diameter of Achnatherum splendens in response to habitat changes in Zhangye wetland[J]. Chin J Plant Ecol, 2017, 41(8): 872-881.

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Figures/Tables 4

References 54

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样地 Plot	PAR (μmol·m^-2·s^-1)	VPD (Pa·kPa)	土壤含水量 Soil moisture (%)	土壤电导率 Soil electrical conductivity (ms·cm^-1)
冠盖区 Subcanopy areas	636.30 ± 14.18^c	27.24 ± 2.68^c	40.07 ± 1.24^a	314 ± 13.89^c
过渡区 Transitional areas	879.20 ± 27.95^b	29.79 ± 4.22^b	37.64 ± 1.07^b	669 ± 15.02^b
空旷区区 Open areas	1 205.10 ± 50.75^a	31.84 ± 3.34^a	31.4 ± 0.67^c	1 090 ± 20.45^a

样地 Plot	PAR (μmol·m^-2·s^-1)	VPD (Pa·kPa)	土壤含水量 Soil moisture (%)	土壤电导率 Soil electrical conductivity (ms·cm^-1)
冠盖区 Subcanopy areas	636.30 ± 14.18^c	27.24 ± 2.68^c	40.07 ± 1.24^a	314 ± 13.89^c
过渡区 Transitional areas	879.20 ± 27.95^b	29.79 ± 4.22^b	37.64 ± 1.07^b	669 ± 15.02^b
空旷区区 Open areas	1 205.10 ± 50.75^a	31.84 ± 3.34^a	31.4 ± 0.67^c	1 090 ± 20.45^a

样地 Plot	冠盖区 Subcanopy areas	过渡区 Transitional areas	空旷区 Open areas	可塑性指数 Plasticity index
叶脉密度 Vein destiny (mm·mm^-2)	1.28 ± 0.14^c	1.46 ± 0.15^b	1.59 ± 0.18^a	0.20
叶脉直径 Vein diameter (mm)	0.21 ± 0.04^a	0.18 ± 0.03^b	0.16 ± 0.02^c	0.24
叶片长度 Leaf length (cm)	58.6 ± 0.39^a	51.99 ± 0.28^b	49.08 ± 0.22^c	0.16
叶片宽度 Leaf width (cm)	0.28 ± 0.04^c	0.31 ± 0.05^b	0.34 ± 0.07^a	0.17
株丛密度 Bundle density (bundle·m^-2)	4.25 ± 0.32^c	13.50 ± 0.82^b	11.75 ± 1.02^a	0.64
P_n(μmol·m^-2·s^-1)	13.2 ± 0.12^c	14.01 ± 0.18^a	13.87 ± 0.13^b	0.05
T_r(mmol·m^-2·s^-1)	6.35 ± 0.07^c	6.83 ± 0.11^a	6.65 ± 0.09^b	0.05
WUE (μmol·mmol^-1)	1.93 ± 0.01^c	2.12 ± 0.02^b	2.18 ± 0.03^a	0.11

样地 Plot	冠盖区 Subcanopy areas	过渡区 Transitional areas	空旷区 Open areas	可塑性指数 Plasticity index
叶脉密度 Vein destiny (mm·mm^-2)	1.28 ± 0.14^c	1.46 ± 0.15^b	1.59 ± 0.18^a	0.20
叶脉直径 Vein diameter (mm)	0.21 ± 0.04^a	0.18 ± 0.03^b	0.16 ± 0.02^c	0.24
叶片长度 Leaf length (cm)	58.6 ± 0.39^a	51.99 ± 0.28^b	49.08 ± 0.22^c	0.16
叶片宽度 Leaf width (cm)	0.28 ± 0.04^c	0.31 ± 0.05^b	0.34 ± 0.07^a	0.17
株丛密度 Bundle density (bundle·m^-2)	4.25 ± 0.32^c	13.50 ± 0.82^b	11.75 ± 1.02^a	0.64
P_n(μmol·m^-2·s^-1)	13.2 ± 0.12^c	14.01 ± 0.18^a	13.87 ± 0.13^b	0.05
T_r(mmol·m^-2·s^-1)	6.35 ± 0.07^c	6.83 ± 0.11^a	6.65 ± 0.09^b	0.05
WUE (μmol·mmol^-1)	1.93 ± 0.01^c	2.12 ± 0.02^b	2.18 ± 0.03^a	0.11

	叶脉密度 Vein destiny	叶脉直径 Vein diameter	LL	LW	BD	SM	PAR	VPD	P_n	T_r	WUE
叶脉密度 Vein destiny	1
叶脉直径 Vein diameter	-0.98^**	1
LL	-0.83^*	0.84^*	1
LW	0.81^*	-0.82^*	-0.86^*	1
BD	0.72^*	-0.73	-0.81^*	0.85^*	1
SM	-0.84^*	0.81^*	0.63	0.63	-0.57	1
PAR	0.83^*	-0.84^*	-0.82^*	0.85^*	0.58	-0.84^*	1
VPD	0.53	-0.63	-0.49	0.58	0.71	-0.83^*	-0.86^*	1
P_n	0.87^*	0.84^*	0.62	0.78	-0.56	-0.81^*	0.86^*	0.82^*	1
T_r	0.83^*	0.81^*	0.61	0.73	0.53	-0.87^*	0.83^*	0.86^*	0.89^*	1
WUE	0.87^*	0.82^*	0.64	0.59	0.73	-0.86^*	0.88^*	0.83^*	0.83^*	-0.88^*	1