The interaction between nitrogen and phosphorous is a strong predictor of intra-plant variation in nitrogen isotope composition in a desert species

Zhang, Jinxin; Gu, Lianhong; Zhang, Jingbo; Wu, Rina; Feng, 王锋 Wang; Lin, Guanghui; Wu, Bo; Lu, Qi; Meng, Ping

doi:10.5194/bg-14-131-2017

Cited by 10 publications

(3 citation statements)

References 83 publications

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“…Our data, for the first time, show that leaf economic traits relate to nutrient resorption in dioecious trees. In desert regions, the high summer temperature and low rainfall lead to a slow plant decomposition and slow biogeochemical cycles of N and P, which results in a decline of the soil nutrient use efficiency (Delgado‐Baquerizo et al, 2013; Zhang et al, 2017). Therefore, plant leaves strengthen N and P retention and have a conservative nutrient strategy to reduce their dependence on the external environment.…”

Section: Discussionmentioning

confidence: 99%

Sex‐specific strategies of nutrient resorption associated with leaf economics in Populus euphratica

Huang

et al. 2022

Journal of Ecology

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There are differences between sexes in physiological and functional traits and possibly in nutrient resorption, particularly in nutrient‐poor environments. However, little is known about the extent of nutrient resorption from fine stems and fine roots, and about how nutrient resorption is related to leaf economics in the males and females of dioecious trees. We investigated nutrient resorption of different organs and explored whether nutrient resorption is associated with nutrient conservation traits of leaves (e.g. leaf thickness, leaf mass per area, LMA) in Populus euphratica females and males in four natural forests along the Tarim River, China. Both female and male leaves had the highest N resorption efficiency (NRE), than stems and roots. We found sexual dimorphism in leaf nutrient resorption at Shaya, Luntai and Yuli forest sites, where P. euphratica males had higher leaf NRE than females, whereas females had a higher leaf P resorption efficiency (PRE). Moreover, the different nutrient resorption strategies were related to leaf economics. P. euphratica males possess a conservation strategy with a higher leaf thickness, LMA and leaf vein density, which positively correlated with leaf NRE, while females with higher leaf PRE resorbed disproportionately more P for the reproductive investment. Synthesis. Populus euphratica males possess a conservation strategy with higher leaf NRE, while females have higher leaf PRE for the reproductive investment. Due to spatial sexual segregation across environmental gradients, dioecious plants are especially vulnerable under future climate change. The differences in nutrient uptake and utilization strategies between females and males may result in a situation where one sex is more prone to future climate change than the other one. Such sex‐specific nutrient resorption strategies are associated with leaf economics. The present study deepens our understanding of the nutrient balance and adaptation strategies of plants under climate change.

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Section: Discussionmentioning

confidence: 99%

Sex‐specific strategies of nutrient resorption associated with leaf economics in Populus euphratica

Huang

et al. 2022

Journal of Ecology

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“…Therefore, they are more closely related to the external environment and can be nutrient-storing tissue. Roots and stems can accumulate more nutrients than necessary to maintain the current metabolic activity and thereafter translocate them to sink tissues like shoot in springtime or leaves when nutrient uptake from the soil is not enough (Zhang et al, 2017). In addition to SAN, SOC1, SOC2, and SAP1 also correlated with the C:N ratio of roots.…”

Section: Effects Of Mean Annual Precipitation and Soil Water Content On Soil Nutrients At Different Depths Of The Soil Profilementioning

confidence: 98%

Stoichiometry of C:N:P in the Roots of Alhagi sparsifolia Is More Sensitive to Soil Nutrients Than Aboveground Organs

et al. 2021

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The stoichiometry of carbon, nitrogen, and phosphorus (C:N:P) among leaves, stems, and roots reflects trade-offs in plants for acquiring resources and their growth strategy. The widely distributed plant Alhagi sparsifolia is an ideal species to study the ecological stoichiometry in different organs in response to the availability of nutrients and water in the desert ecosystem. However, which response of organs is most sensitive to environmental conditions is still unclear. To answer this question, we collected samples of plants and soils including not only aboveground leaves and stems, but also underground roots and soils from a wide range of arid areas during the growing season. The C, N, P, C:N, C:P, and N:P ratios in leaves, thorns, stems, and roots were derived to explore their relationship as well as their response mechanisms to nutrients and water spanning 1 m deep in the soil. The results showed that the order of N concentration was leaves > thorns > stems > roots, that the concentration of P in the leaves, thorns, and stems was similar, and that their values were higher than those in the roots. First, the C:N ratios in the leaves and stems were significantly positively correlated with the ratio in roots. The C:N ratios in each organ showed a significant relationship with the soil alkali hydrolyzable nitrogen (SAN) above a depth of 60 cm. In addition to SAN, soil available phosphorus (SAP) and soil organic carbon (SOC) affect the C:N ratio in the roots. Second, the C:P and N:P ratios in aboveground organs showed no correlations with the ratios in roots. The C:P and N:P ratios in the leaves and thorns have no relationship with soil nutrients, while the C:P ratio in roots was influenced by SAN and SOC in all soil layers. Finally, the N:P ratios in roots were also affected by nutrients in different soil depths at 0–20 and 60–80 cm. These results illustrate that the roots were more sensitive to soil nutrients than the aboveground parts. Our study of ecological stoichiometry also suggests a novel systematic approach for analyzing the sensitivity of responses of an organ to environmental conditions.

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“…Another reason for the negative relationship between 15 N and WUE whole-plant might be the decreased NO − 3 transport from root to shoot of plants exposed to stress-condition (Yousfi et al, 2012). Due to the fractionation induced by nitrate reductase (NR), NO − 3 not assimilated in the roots would be enriched in 15 N and exported to shoots for assimilation, causing an increased d 15 N in shoots relative to roots (Zhang et al, 2017). Hence, stress conditions would restrict NO − 3 transport from the roots to the shoots, therefore increasing 15 N in root while decreasing it in the shoots compared with the flooding irrigation (Yousfi et al, 2012).…”

Section: Relationship Between Organs D 15 N and Wuementioning

confidence: 99%

Relationships between stable isotope natural abundances (δ13C and δ15N) and water use efficiency in rice under alternate wetting and drying irrigation in soils with high clay contents

et al. 2022

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Natural abundance of the stable isotope (δ13C and δ15N) in plants is widely used to indicate water use efficiency (WUE). However, soil water and texture properties may affect this relationship, which remains largely elusive. Therefore, the purpose of this study was to evaluate δ13C as affected by different combinations of alternate wetting and drying irrigation (AWD) with varied soil clay contents in different organs and whole plant and assess the feasibility of using δ13C and δ15N as a physiological indicator of whole-plant water use efficiency (WUEwhole-plant). Three AWD regimes, I100 (30 mm flooded when soil reached 100% saturation), I90 (30 mm flooded when reached 90% saturation) and I70 (30 mm flooded when reached 70% saturation) and three soil clay contents, 40% (S40), 50% (S50), and 60% (S60), were included. Observed variations in WUEwhole-plant did not conform to theoretical expectations of the organs δ13C (δ13Corgans) of plant biomass based on pooled data from all treatments. However, a positive relationship between δ13Cleaf and WUEET (dry biomass/evapotranspiration) was observed under I90 regime, whereas there were no significant relationships between δ13Corgans and WUEET under I100 or I70 regimes. Under I100, weak relationships between δ13Corgans and WUEET could be explained by (i) variation in C allocation patterns under different clay content, and (ii) relatively higher rate of panicle water loss, which was independent of stomatal regulation and photosynthesis. Under I70, weak relationships between δ13Corgans and WUEET could be ascribed to (i) bigger cracks induced by water-limited irrigation regime and high clay content soil, and (ii) damage caused by severe drought. In addition, a negative relationship was observed between WUEwhole-plant and shoot δ15N (δ15Nshoot) across the three irrigation treatments, indicating that WUEwhole-plant is tightly associated with N metabolism and N isotope discrimination in rice. Therefore, δ13C should be used cautiously as an indicator of rice WUEwhole-plant at different AWD regimes with high clay content, whereas δ15N could be considered an effective indicator of WUEwhole-plant.

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The interaction between nitrogen and phosphorous is a strong predictor of intra-plant variation in nitrogen isotope composition in a desert species

Cited by 10 publications

References 83 publications

Sex‐specific strategies of nutrient resorption associated with leaf economics in Populus euphratica

Sex‐specific strategies of nutrient resorption associated with leaf economics in Populus euphratica

Stoichiometry of C:N:P in the Roots of Alhagi sparsifolia Is More Sensitive to Soil Nutrients Than Aboveground Organs

Relationships between stable isotope natural abundances (δ13C and δ15N) and water use efficiency in rice under alternate wetting and drying irrigation in soils with high clay contents

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