Water Supply Increases N Acquisition and N Resorption from Old Branches in the Leafless Shrub <i>Calligonum caput-medusae</i> at the Taklimakan Desert Margin

Irrigation is the main strategy deployed to improve vegetation establishment, but the effects of increasing water availability on N use strategies in desert shrub species have received little attention. Pot experiments with drought-tolerant shrub <i>Calligonum caput-medusae</i> supplied...

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Autores principales:	Caibian Huang, Fanjiang Zeng, Bo Zhang, Jie Xue, Shaomin Zhang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	<i>Calligonum caput-medusae</i> N resorption water addition soil inorganic N biomass Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/bc0d8fde654d4afc90d370fb4bd6cd40
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spelling	oai:doaj.org-article:bc0d8fde654d4afc90d370fb4bd6cd402021-11-25T19:16:24ZWater Supply Increases N Acquisition and N Resorption from Old Branches in the Leafless Shrub <i>Calligonum caput-medusae</i> at the Taklimakan Desert Margin10.3390/w132232882073-4441https://doaj.org/article/bc0d8fde654d4afc90d370fb4bd6cd402021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/22/3288https://doaj.org/toc/2073-4441Irrigation is the main strategy deployed to improve vegetation establishment, but the effects of increasing water availability on N use strategies in desert shrub species have received little attention. Pot experiments with drought-tolerant shrub <i>Calligonum caput-medusae</i> supplied with water at five field capacities in the range of 30–85% were conducted using local soil at the southern margin of the Taklimakan Desert. We examined the changes in plant biomass, soil N status, and plant N traits, and addressed the relationships between them in four- and seven-month-old saplings and mature shrubs after 28 months. Results showed that the growth of <i>C. caput-medusae</i> was highly responsive to increased soil moisture supply, and strongly depleted the soil available inorganic N pools from 16.7 mg kg<sup>−1</sup> to an average of 1.9 mg kg<sup>−1</sup>, although the total soil N pool increased in all treatments. Enhancement of biomass production by increasing water supply was closely linked to increasing total plant N pool, N use efficiency (NUE), N resorption efficiency (NRE), and proficiency (NRP) in four-month saplings, but that to total plant N pool, NRE, and NRP after 28 months. The well-watered plants had lower N concentrations in senesced branches compared to their counterparts experiencing the two lowest water inputs. The mature shrubs had higher NRE and NRP than saplings and the world mean levels, suggesting a higher N conservation. Structural equation models showed that NRE was largely controlled by senesced branch N concentrations, and indirectly affected by water supply, whereas NRP was mainly determined by water supply. Our results indicated that increasing water availability increased the total N uptake and N resorption from old branches to satisfy the N requirement of <i>C. caput-medusae</i>. The findings lay important groundwork for vegetation establishment in desert ecosystems.Caibian HuangFanjiang ZengBo ZhangJie XueShaomin ZhangMDPI AGarticle<i>Calligonum caput-medusae</i>N resorptionwater additionsoil inorganic NbiomassHydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3288, p 3288 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	<i>Calligonum caput-medusae</i> N resorption water addition soil inorganic N biomass Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	<i>Calligonum caput-medusae</i> N resorption water addition soil inorganic N biomass Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Caibian Huang Fanjiang Zeng Bo Zhang Jie Xue Shaomin Zhang Water Supply Increases N Acquisition and N Resorption from Old Branches in the Leafless Shrub <i>Calligonum caput-medusae</i> at the Taklimakan Desert Margin
description	Irrigation is the main strategy deployed to improve vegetation establishment, but the effects of increasing water availability on N use strategies in desert shrub species have received little attention. Pot experiments with drought-tolerant shrub <i>Calligonum caput-medusae</i> supplied with water at five field capacities in the range of 30–85% were conducted using local soil at the southern margin of the Taklimakan Desert. We examined the changes in plant biomass, soil N status, and plant N traits, and addressed the relationships between them in four- and seven-month-old saplings and mature shrubs after 28 months. Results showed that the growth of <i>C. caput-medusae</i> was highly responsive to increased soil moisture supply, and strongly depleted the soil available inorganic N pools from 16.7 mg kg<sup>−1</sup> to an average of 1.9 mg kg<sup>−1</sup>, although the total soil N pool increased in all treatments. Enhancement of biomass production by increasing water supply was closely linked to increasing total plant N pool, N use efficiency (NUE), N resorption efficiency (NRE), and proficiency (NRP) in four-month saplings, but that to total plant N pool, NRE, and NRP after 28 months. The well-watered plants had lower N concentrations in senesced branches compared to their counterparts experiencing the two lowest water inputs. The mature shrubs had higher NRE and NRP than saplings and the world mean levels, suggesting a higher N conservation. Structural equation models showed that NRE was largely controlled by senesced branch N concentrations, and indirectly affected by water supply, whereas NRP was mainly determined by water supply. Our results indicated that increasing water availability increased the total N uptake and N resorption from old branches to satisfy the N requirement of <i>C. caput-medusae</i>. The findings lay important groundwork for vegetation establishment in desert ecosystems.
format	article
author	Caibian Huang Fanjiang Zeng Bo Zhang Jie Xue Shaomin Zhang
author_facet	Caibian Huang Fanjiang Zeng Bo Zhang Jie Xue Shaomin Zhang
author_sort	Caibian Huang
title	Water Supply Increases N Acquisition and N Resorption from Old Branches in the Leafless Shrub <i>Calligonum caput-medusae</i> at the Taklimakan Desert Margin
title_short	Water Supply Increases N Acquisition and N Resorption from Old Branches in the Leafless Shrub <i>Calligonum caput-medusae</i> at the Taklimakan Desert Margin
title_full	Water Supply Increases N Acquisition and N Resorption from Old Branches in the Leafless Shrub <i>Calligonum caput-medusae</i> at the Taklimakan Desert Margin
title_fullStr	Water Supply Increases N Acquisition and N Resorption from Old Branches in the Leafless Shrub <i>Calligonum caput-medusae</i> at the Taklimakan Desert Margin
title_full_unstemmed	Water Supply Increases N Acquisition and N Resorption from Old Branches in the Leafless Shrub <i>Calligonum caput-medusae</i> at the Taklimakan Desert Margin
title_sort	water supply increases n acquisition and n resorption from old branches in the leafless shrub <i>calligonum caput-medusae</i> at the taklimakan desert margin
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/bc0d8fde654d4afc90d370fb4bd6cd40
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Water Supply Increases N Acquisition and N Resorption from Old Branches in the Leafless Shrub <i>Calligonum caput-medusae</i> at the Taklimakan Desert Margin

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