Nitrogen and phosphorus resorption of desert plants with various degree of propensity to salt in response to drought and saline stress

Luo, Yan; Chen, Yue; Peng, Qingwen; Li, Kaihui; Mohammat, Anwar

doi:10.1016/j.ecolind.2021.107488

Cited by 14 publications

(12 citation statements)

References 42 publications

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“…Previous studies have demonstrated that increasing aridity significantly decreases N return from plants to the soil (Wu et al., 2022; Yuan & Chen, 2008). This may be attributed to the fact that under high aridity conditions and low soil N availability, plants are able to alleviate N limitation by enhancing N retention (e.g., by increasing N resorption) (Luo et al., 2021; Yuan & Chen, 2008). This process may result in an increase in plant net N accumulation, thereby increasing the contribution of 15 N fractionation to soil 15 N enrichment during plant net N accumulation.…”

Section: Discussionmentioning

confidence: 99%

Aridity threshold for alpine soil nitrogen isotope signature and ecosystem nitrogen cycling

Mao,

Pan,

Song

et al. 2024

Global Change Biology

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Determination of tipping points in nitrogen (N) isotope (δ15N) natural abundance, especially soil δ15N, with increasing aridity, is critical for estimating N‐cycling dynamics and N limitation in terrestrial ecosystems. However, whether there are linear or nonlinear responses of soil δ15N to increases in aridity and if these responses correspond well with soil N cycling remains largely unknown. In this study, we investigated soil δ15N and soil N‐cycling characteristics in both topsoil and subsoil layers along a drought gradient across a 3000‐km transect of drylands on the Qinghai–Tibetan Plateau. We found that the effect of increasing aridity on soil δ15N values shifted from negative to positive with thresholds at aridity index (AI) = 0.27 and 0.29 for the topsoil and subsoil, respectively, although soil N pools and N transformation rates linearly decreased with increasing aridity in both soil layers. Furthermore, we identified markedly different correlations between soil δ15N and soil N‐cycling traits above and below the AI thresholds (0.27 and 0.29 for topsoil and subsoil, respectively). Specifically, in wetter regions, soil δ15N positively correlated with most soil N‐cycling traits, suggesting that high soil δ15N may result from the “openness” of soil N cycling. Conversely, in drier regions, soil δ15N showed insignificant relationships with soil N‐cycling traits and correlated well with factors, such as soil‐available phosphorus and foliage δ15N, demonstrating that pathways other than typical soil N cycling may dominate soil δ15N under drier conditions. Overall, these results highlight that different ecosystem N‐cycling processes may drive soil δ15N along the aridity gradient, broadening our understanding of N cycling as indicated by soil δ15N under changing drought regimes. The aridity threshold of soil δ15N should be considered in terrestrial N‐cycling models when incorporating 15N isotope signals to predict N cycling and availability under climatic dryness.

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Section: Discussionmentioning

confidence: 99%

Aridity threshold for alpine soil nitrogen isotope signature and ecosystem nitrogen cycling

Mao,

Pan,

Song

et al. 2024

Global Change Biology

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“…Furthermore, the significant negative correlation between N content and Na content in senescent leaves implies that an increase in Na content under salt treatment can inhibit plant N absorption. Finally, the enhancement of N and P resorption due to salt treatment might also provide a partial explanation, as N and P resorption efficiency significantly increased with soil salinity ( Luo et al., 2021 ). Interestingly, as salt treatment intensified, plant N remained consistent, whereas P exhibited a rising trend, with no significant correlation found between senescent leaves and green leaves.…”

Section: Discussionmentioning

confidence: 99%

Decoupling of nutrient stoichiometry in Suaeda glauca (Bunge) senesced leaves under salt treatment

Yang,

Liu,

Qian

et al. 2023

Front. Plant Sci.

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The stoichiometry of senesced leaves is pivotal in nutrient cycling and can be significantly influenced by soil salinization, a rising global issue threatening the functionality of ecosystems. However, the impacts of soil salinization on senesced leaf stoichiometry are not fully understood. In this study, we conducted a pot experiment with varying soil salt concentrations to examine their influence on the concentrations and stoichiometric ratios of nitrogen (N), phosphorus (P), sodium (Na), potassium (K), calcium (Ca), magnesium (Mg), and zinc (Zn) in the senesced leaves of Suaeda glauca (Bunge). Compared to the control group, salt treatments significantly enhanced Na concentration while diminishing the concentrations of K, Ca, Mg, Zn, N, and P. Interestingly, as salinity levels escalated, N concentration maintained stability, whereas P concentration exhibited an increasing trend. Moreover, K, Ca, and Mg significantly declined as salt levels rose. Salt treatments brought about significant changes in stoichiometric ratios, with the N:P, K:Na, N:Na, N:Mg, and Ca : Mg ratios dropping and the N:Ca and N:K ratios rising, illustrating the varying nutrient coupling cycles under different salt conditions. These findings shed light on the plasticity of stoichiometric traits in S. glauca senesced leaves in response to soil salinization shifts, which could potentially offer insights into nutrient cycling reactions to soil salinization.

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“…Desert plants are a type of zonal vegetation that thrives in arid regions and has special functional characteristics. The building of desert plants' communities is significantly influenced by the trade-off relationship between their functional traits and adversity strategies [25]. In order to compare phenotype-based tactics among different species, Westoby recommended the use of trait-based dimensions.…”

Section: Introductionmentioning

confidence: 99%

Interspecific Integration of Chemical Traits in Desert Plant Leaves with Variations in Soil Water and Salinity Habitats

Yang,

Zhang,

Song

et al. 2023

Forests

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Understanding the relationship between soil environmental conditions and the interspecific integration of plant traits might shed light on how plants adapt to their environment. In order to clarify the adaptation strategies of desert plants in the various habitats, this study calculated interspecific trait integration (ITI) and plant trait networks (PTN) by selecting plants from high water-salinity habitat (HSM) with salt stress and low water-salinity habitat (LSM) with drought stress in the Ebinur Lake region. Eight different phytochemical traits were taken into consideration, including carbon (C), nitrogen (N), phosphorus (P), sulfur (S), potassium (K), calcium (Ca), sodium (Na), and magnesium (Mg). Six soil factors were chosen, including soil pH, water content (SVWC), electrical conductivity (EC), soil nitrogen (N), phosphorus (P), and potassium (K). The results obtained are shown below: (1) the relationship between plant leaf chemical traits was closer in HSM than in LSM, and the correlation between C and other leaf chemical traits was significant in HSM and insignificant in LSM; (2) the correlations between soil factors and ITI were not statistically significant; however, in both soil water-salinity habitats, the strength of fit between SVWC and ITI was the greatest, while the strength of fit between EC and ITI was the smallest; and (3) according to the PTN, C and Ca are the two most central traits for the growth of desert leaf chemical plants in Ebinur Lake, which is consistent with the results of the PCA. Coordination of plant leaf traits along water-salinity gradients involves many different combinations of traits, and the use of ITI and PTN can quantify the complex relationships between multiple traits to a greater extent, highlighting the multivariate mechanisms of plant response and adaptation to soil habitats. This information will help expand and optimize our ability to observe and predict desert plant responses to habitat change, providing powerful insights for assessing desert plant survival strategies.

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Nitrogen and phosphorus resorption of desert plants with various degree of propensity to salt in response to drought and saline stress

Cited by 14 publications

References 42 publications

Aridity threshold for alpine soil nitrogen isotope signature and ecosystem nitrogen cycling

Aridity threshold for alpine soil nitrogen isotope signature and ecosystem nitrogen cycling

Decoupling of nutrient stoichiometry in Suaeda glauca (Bunge) senesced leaves under salt treatment

Interspecific Integration of Chemical Traits in Desert Plant Leaves with Variations in Soil Water and Salinity Habitats

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