Estimation of hydraulic redistribution ofPopulus euphratica in Ebinur Lake Wetland Nature Reserve in Xinjiang Uygur Autonomous Region, China

doi:10.3724/SP.J.1258.2011.00816

Abstract

Abstract:

Aims Our objective was to construct and use a Ryel model to quantify hydraulic redistribution of Populus euphratica, a species in desert riparian vegetation.

Methods We constructed a Ryel model to estimate the amount of net water redistribution under the canopy of P. euphratica. We based the model on data from studies measuring the shape and distribution of roots under the canopy of P. euphratica and observing values for volumetric water contents (θ_s), saturated hydraulic conductivity (K_s), maximum radial soil-root conductance of the entire active root system for water (C_RT), soil water potential (ψ_i) and residual volumetric water contents (θ_r) in five soil layers. We used this model to make a short-term simulation of root hydraulic redistribution in different seasons.

Important findings Hydraulic redistribution under the canopy of P. euphratica reached a maximum at 2:30 am. The amount of net water redistribution under the canopy decreased and moved towards the underlying soil with changes in the growing season. In June, hydraulic redistribution mainly occurred in the 0-40 cm soil layer, the maximum amount of redistribution was 0.022 0 cm and the total at night was up to 0.111 0 cm. In August, hydraulic redistribution mainly occurred in the 10-70 cm soil layer, the maximum amount of redistribution was 0.006 5 cm and the total at night was up to 0.018 4 cm. In October, hydraulic redistribution mainly occurred in the 70-100 cm soil layer, the maximum amount of redistribution was 0.003 9 cm and the total at night was up to 0.008 6 cm.

Key words: Ebinur Lake Wetland Nature Reserve, hydraulic redistribution, Populus euphratica, Ryel model

YANG Xiao-Dong, LÜ Guang-Hui. Estimation of hydraulic redistribution ofPopulus euphratica in Ebinur Lake Wetland Nature Reserve in Xinjiang Uygur Autonomous Region, China[J]. Chin J Plant Ecol, 2011, 35(8): 816-824.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2011.00816

https://www.plant-ecology.com/EN/Y2011/V35/I8/816

Figures/Tables 8

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土层 Soil layer (cm)	活跃根系比例 Active root proportion
0-10	0.493
10-40	0.497
40-70	0.499
70-100	0.500
100-150	0.501

土层 Soil layer (cm)	活跃根系比例 Active root proportion
0-10	0.493
10-40	0.497
40-70	0.499
70-100	0.500
100-150	0.501

土层 Soil layer (cm)	饱和容积含水量 Saturated volumetric water content (cm³·cm^-3)	剩余容积含水量 Residual volumetric water content (cm³·cm^-3)
0-10	0.29	0.073
10-40	0.36	0.066
40-70	0.41	0.067
70-100	0.40	0.067
100-150	0.34	0.063

土层 Soil layer (cm)	饱和容积含水量 Saturated volumetric water content (cm³·cm^-3)	剩余容积含水量 Residual volumetric water content (cm³·cm^-3)
0-10	0.29	0.073
10-40	0.36	0.066
40-70	0.41	0.067
70-100	0.40	0.067
100-150	0.34	0.063

6月 June		8月 August		10月 October
土层 Soil layer (cm)	Ψ₅₀ (MPa)	土层 Soil layer (cm)	Ψ₅₀ (MPa)	土层 Soil layer (cm)	Ψ₅₀ (MPa)
0-10	-2.45	0-10	-0.33	0-10	-0.13
10-40	-1.60	10-40	-2.16	10-40	-0.26
40-70	-0.46	40-70	-1.86	40-70	-0.58
70-100	-1.20	70-100	-1.33	70-100	-2.00
100-150	-0.40	100-150	-2.40	100-150	-1.60