水力性状对荒漠植物群落物种多度分布格局的影响

doi:10.13866/j.azr.2023.03.08

Abstract

Abstract:

Plant death caused by drought is an important cause of species composition changes in terrestrial ecosystems. Revealing the influence of hydraulic triats on species distribution, which is of great theoretical significance for understanding plant drought adaptation, restoration and management of desert vegetation. In this study, the woody plants in the Ebinur Lake Wetland Nature Reserve were selected as subject to compare the variation characteristics of species abundance and hydraulic traits under soil drought gradient and analyze the relationship between hydraulic traits and species abundance distribution. Results showed that the sum of abundance (community density) of all species did not change significantly. However, the responses of different species abundance to drought stress were significantly different. With the increase in soil drought, the specific conductivity, quasi-steady conductivity, and Huber value increased; the water potential of branches and leaves decreased continuously, and the stem wood density did not change significantly. The difference of hydraulic triats among species changed with the degree of drought. Redundancy analysis and generalized additive model showed that 92.8% of the variation of desert woody plant abundance distribution pattern can be explained by the measured hydraulic triats. In addition, plant abundance increased with the quasi-steady conductivity, specific conductivity, Huber value, and water potential of branches and leaves but decreased with the increase in stem wood density. Therefore, the changes of the woody plant abundance distribution can be predicted using the changes of hydraulic traits.

Key words: desert plants, hydraulic traits, abundance distribution, drought adaptation strategies

SUN Qixing, YANG Xiaodong, LI Borui, KONG Cuicui, Elhamjan ANWAR, ZHOU Jie, LYU Guanghui. Effects of hydraulic traits on the species abundance distribution pattern of desert plant communities[J].Arid Zone Research, 2023, 40(3): 412-424.

Figures/Tables 11

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采样序号	土壤含水量/%	土壤干旱梯度
D0	18.54±0.87	非干旱
D1	12.74±1.25	轻度干旱
D2	9.38±0.80	中度干旱
D3	3.63±0.66	重度干旱

排序轴	第一轴	第二轴
特征值	0.65	0.26
多度与水力性状相关性	0.99	0.99
多度变异的累计百分数/%	64.56	90.46
多度-水力性状关系的累计解释量/%	65.96	92.42

	模型	R²	D_exp/%	GCV
a	s(Ψl_min^*)	0.13	13.30	32.73
b	s(Ψl_min^**)+s(K_s)	0.28	34.00	31.17
c	s(Ψl_min^*)+s(K_s^)+s(Ψl_pd^*)	0.43	51.70	28.07
d	s(Ψl_min^*)+s(K_s^)+s(Ψl_pd^)+s(H_v^)	0.80	75.30	23.43
e	s(Ψl_min^*)+s(K_s^)+s(Ψl_pd^)+s(H_v^)+s(Ψs_min)	0.80	76.50	22.41
f	s(Ψl_min^*)+s(K_s^)+s(Ψl_pd^)+s(H_v^*)+s(Ψs_min)+s(SWD^)	0.81	76.80	19.56
g	s(Ψl_min^*)+s(K_s^)+s(Ψl_pd^)+s(H_v^)+s(Ψs_min^)+s(SWD^)+s(K_wb^)	0.87	86.40	15.62
h	s(Ψl_min^*)+s(K_s^)+s(Ψl_pd^)+s(H_v^)+s(Ψs_min^)+s(SWD^)+s(K_wb^)+s(Ψs_pd^)	0.93	92.80	14.45

Effects of hydraulic traits on the species abundance distribution pattern of desert plant communities

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