Distribution and Seasonal Dynamics of Roots in a Revegetated Stand of<i>Artemisia ordosica</i>Kracsh. in the Tengger Desert (North China)

Zhang, Zhishan; Li, Xinrong; Wang, Tao; Wang, Xinping; Xue, Qin-Wu; Liu, Lichao

doi:10.1080/15324980802182980

Cited by 33 publications

(26 citation statements)

References 42 publications

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“…Compared to A. ordosica, C. korshinskii had a deeper root distribution and could use deep soil water through the dry periods when precipitation did not supply the deep soil. A. ordosica had a greater proportion of its root distribution in the shallow soil, layers and was therefore limited to using precipitation [13,29,102]. The seasonal dynamics of fine roots were significantly influenced by SWC.…”

Section: Morphological Adjustment and The Regulation Threshold Of Vegmentioning

confidence: 99%

“…When SWC is lower than this threshold, the plants are water stressed and need a large root system so that they can obtain sufficient water to maintain normal physiological activities. This study revealed the response of the desert plant roots to water variation and the ecological countermeasures taken by them [29,102]. The ecological mechanism adapted by many desert plants seemed to be to produce large root systems [6].…”

Section: Morphological Adjustment and The Regulation Threshold Of Vegmentioning

confidence: 99%

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Review of the ecohydrological processes and feedback mechanisms controlling sand-binding vegetation systems in sandy desert regions of China

et al. 2013

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Soil water is the key abiotic limiting factor in desert areas and hydrological processes determine the vegetation composition, patterns and processes in desert regions. The hydrological processes can be altered by vegetation succession. In this paper, we review the major advances in ecohydrological research and their potential impact on plant-water relations in revegetated desert communities. The major advances in ecohydrological research over the past 50 years in desert areas were analyzed using a case study that investigated the long-term ecosystem effects of sand-binding vegetation in the Tengger Desert. Key challenges and opportunities for ecohydrology research in the future are also discussed in the context of the major scientific issues affecting sand binding vegetation.

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Section: Morphological Adjustment and The Regulation Threshold Of Vegmentioning

confidence: 99%

Section: Morphological Adjustment and The Regulation Threshold Of Vegmentioning

confidence: 99%

Review of the ecohydrological processes and feedback mechanisms controlling sand-binding vegetation systems in sandy desert regions of China

et al. 2013

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“…As the root density and litter production rate are commonly larger under canopy than interspace (e.g. Zhang et al, 2008), the lower respiration rate under canopy tends to facilitate the accumulation of biomass and organic matter and feedback to the functioning of resource islands during prolonged periods.…”

Section: Plant-interspace Differences In Soil C Fluxesmentioning

confidence: 99%

“…The vertical distribution of the SOM pools was described following Shi et al (2013). At the ecosystem level, the aboveground biomass was linearly related to the crown projection area (M S = 0.2917 × π (0.5D) 2 ; see Zhang et al, 2008). The total root biomass was then calculated as proportional to the aboveground biomass using a root-shoot ratio of 0.47 (M R = 0.47M S ; Xiao et al, 2005).…”

Section: Parameterization Of Soil C and N Poolsmentioning

confidence: 99%

“…The vertical profile of root biomass was parameterized as decreasing exponentially with depth, using the depth profile reported by Lai et al (2016). In the horizontal direction, root biomass was set to decrease linearly with the distance from the centre of a shrub crown (Zhang et al, 2008). The N content was parameterized following the measurement of Wang et al (2015).…”

Section: Parameterization Of Soil C and N Poolsmentioning

confidence: 99%

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Modelling the diurnal and seasonal dynamics of soil CO<sub>2</sub> exchange in a semiarid ecosystem with high plant–interspace heterogeneity

et al. 2018

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Abstract. We used process-based modelling to investigate the roles of carbon-flux (C-flux) components and plantinterspace heterogeneities in regulating soil CO 2 exchanges (F S ) in a dryland ecosystem with sparse vegetation. To simulate the diurnal and seasonal dynamics of F S , the modelling considered simultaneously the CO 2 production, transport and surface exchanges (e.g. biocrust photosynthesis, respiration and photodegradation). The model was parameterized and validated with multivariate data measured during the years 2013-2014 in a semiarid shrubland ecosystem in Yanchi, northwestern China. The model simulation showed that soil rewetting could enhance CO 2 dissolution and delay the emission of CO 2 produced from rooting zone. In addition, an ineligible fraction of respired CO 2 might be removed from soil volumes under respiration chambers by lateral water flows and root uptakes. During rewetting, the lichen-crusted soil could shift temporally from net CO 2 source to sink due to the activated photosynthesis of biocrust but the restricted CO 2 emissions from subsoil. The presence of plant cover could decrease the root-zone CO 2 production and biocrust C sequestration but increase the temperature sensitivities of these fluxes. On the other hand, the sensitivities of root-zone emissions to water content were lower under canopy, which may be due to the advection of water flows from the interspace to canopy. To conclude, the complexity and plant-interspace heterogeneities of soil C processes should be carefully considered to extrapolate findings from chamber to ecosystem scales and to predict the ecosystem responses to climate change and extreme climatic events. Our model can serve as a useful tool to simulate the soil CO 2 efflux dynamics in dryland ecosystems.

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Nitrogen enrichment alters nutrient resorption and exacerbates phosphorus limitation in the desert shrub Artemisia ordosica

Zheng

She

Zhang

et al. 2018

Ecology and Evolution

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Increasing nitrogen (N) deposition and precipitation are major drivers of global changes that are expected to influence plant nutrient resorption in desert ecosystems, where plant growth is often nutrient and water limited. However, knowledge on the effects of increased N and precipitation on them remain poorly understood. This study determined the effects of increased N (ambient, 60 kg N ha−1 year−1) and water supply (ambient, +20%, +40%), and their combination on the leaf nutrient resorption of Artemisia ordosica, a dominant shrub in the Mu Us Desert of northern China. After 2 years of treatments, only N addition significantly decreased the N resorption efficiency of A. ordosica. Both N and water addition had no effect on the phosphorus (P) resorption efficiency of this shrub, and there were no interactive effects of N and water availability on shrub nutrient resorption. The responses of shrub leaf N:P ratio tended to saturate as soil available N:P increased. The aboveground net primary productivity of A. ordosica was positively correlated with leaf P resorption efficiency, rather than N resorption efficiency. Our results suggest that N addition exacerbated the P limitation of the shrub growth and played a more fundamental role than water addition in controlling the nutrient resorption process of the desert shrub A. ordosica. This information contributes to understand the relationship between nutrient conservation strategy and plant growth of desert shrub species under global environmental changes.

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Distribution and Seasonal Dynamics of Roots in a Revegetated Stand ofArtemisia ordosicaKracsh. in the Tengger Desert (North China)

Cited by 33 publications

References 42 publications

Review of the ecohydrological processes and feedback mechanisms controlling sand-binding vegetation systems in sandy desert regions of China

Review of the ecohydrological processes and feedback mechanisms controlling sand-binding vegetation systems in sandy desert regions of China

Modelling the diurnal and seasonal dynamics of soil CO<sub>2</sub> exchange in a semiarid ecosystem with high plant–interspace heterogeneity

Nitrogen enrichment alters nutrient resorption and exacerbates phosphorus limitation in the desert shrub Artemisia ordosica

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Distribution and Seasonal Dynamics of Roots in a Revegetated Stand ofArtemisia ordosicaKracsh. in the Tengger Desert (North China)

Cited by 33 publications

References 42 publications

Review of the ecohydrological processes and feedback mechanisms controlling sand-binding vegetation systems in sandy desert regions of China

Review of the ecohydrological processes and feedback mechanisms controlling sand-binding vegetation systems in sandy desert regions of China

Modelling the diurnal and seasonal dynamics of soil CO&lt;sub&gt;2&lt;/sub&gt; exchange in a semiarid ecosystem with high plant–interspace heterogeneity

Nitrogen enrichment alters nutrient resorption and exacerbates phosphorus limitation in the desert shrub Artemisia ordosica

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Modelling the diurnal and seasonal dynamics of soil CO<sub>2</sub> exchange in a semiarid ecosystem with high plant–interspace heterogeneity