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Root ecological stoichiometry (A–F) of Carex brevicuspis (means ± standard errors, n = 7) under different P addition frequencies (treatments A–D represent: no P addition treatment; three - time P addition treatment; two-time P addition treatment; and one-time P addition treatment, respectively). Different letters indicate significant differences between treatments at the 0.05 significance level.
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Phosphorus (P) enrichment as a result of anthropogenic activities can potentially alter plant C:N:P stoichiometry. However, the influence of different P enrichment frequencies on plant C:N:P stoichiometry in P-limited ecosystems is still unclear. In this study, we conducted a P-addition experiment to elucidate the effect of various P enrichment fre...
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Eucalypt seedlings differently modulate root morphology in response to phosphorus availability, with changes in the length or density of root hairs being more common that changes in root length.
Abstract
Phosphorus (P) is an essential nutrient for plant growth and development and thus can restrict biomass accumulation when it is at low...
Various types of flat rhizoboxes aid in root visualization and tracking in experiments where the focus is upon root system growth and development. While size of the pot is known to affect experiments, nothing is known about the impact of rhizoboxes—not only their volume, but also their shape might affect root and shoot growth. Therefore, we investi...
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This study was conducted to assess the effect of different soil compaction levels on the establishment and growth of sesame. Four compaction levels were used, namely, 1.2, 1.4, 1.6 and 1.8 g/cm 3 as well as the control (0.95 g/cm 3). The average plant growth parameters were found to be increased as the compaction level is increased. At the compacti...
Aeschynanthus longicaulis is a gesneriad that can be grown as a hanging basket or indoor pot plant. Fertilization practice is rarely researched in relation to the genus Aeschynanthus cultivation. This pot experiment is conducted on soilless media to optimize the best NPK ratio for the vegetative growth of A. longicaulis. Four fertilization levels (...
Citations
... Besides affecting plant biomass, height, and density, the hydrological regime (e.g., water level and submergence time) can also affect nutrient transformation and availability by controlling various biogeochemical processes, which then determine plant stoichiometric characteristics (Anderson and Lockaby, 2011;Li et al., 2018c). Our results showed that leaf TC concentration significantly decreased while leaf TN and TP concentrations significantly increased with increasing water level, indicating that water level had a significant effect on leaf nutrient concentrations. ...
... The stoichiometric homeostasis coefficient (H) represents the ability of a plant to maintain a relatively stable nutrient composition under a changing environment and underpins the interpretation of observed variations in plant elemental stoichiometric ratios (Sterner and Elser, 2002). Previous studies reported that vascular plants had a strong ability to regulate stoichiometric homeostasis in freshwater aquatic ecosystems (Li et al., 2018c;Liu et al., 2018b;Su et al., 2018). However, stoichiometric homeostasis could reflect the variation in species and plant nutrients responding to external environmental fluctuations. ...
Water level and submergence time are important factors influencing plant growth and plant C:N:P characteristics in freshwater wetlands. Here, we performed a controlled experiment using water levels and submergence times with the aim of investigating the changes in plant growth and stoichiometric characteristics, as well as the strength of N, P, and N:P homeostasis in Carex brevicuspis, China. Results showed that biomass, density, height, and total carbon (TC) decreased significantly with increasing water level; however, total nitrogen (TN) and total phosphorus (TP) increased significantly. The highest TN and TP were at 40 cm water level, while the highest C:N, C:P, and N:P ratios were at 0 cm water level. Furthermore, significant stoichiometric homeostasis of C. brevicuspis was found for N (HN) and P (HP) except for N:P (HN:P). HN and HP decreased with increasing submergence time, and HN was consistently greater than HP, indicating that C. brevicuspis had a weak ability to maintain its internal P balance under long-term submergence. Therefore, the impact of water level and submergence time on plant growth and stoichiometric characteristics in this study are applicable to the conservation and management of the wetlands dominated with C. brevicuspis.
... Plant nutrient content and stoichiometry have been studied to detect tissue nutrient allocation (Wang et al., 2015b;Hu et al., 2018), seasonal nutrient variation (Fu et al., 2018), nutrient limitation (Bedford et al., 1999;Demars and Edwards, 2007) or variation between plant functional types (Wang and Moore, 2014;Hu et al., 2018). For example, Li et al. (2017) and Li et al. (2018) showed that soil nutrient content and stoichiometry are changing along hydrological gradients, and that plant nutrient content and stoichiometry are regulated rather by flooding duration than by soil nutrient content. ...
Wetlands occupy the transitional zone between aquatic and terrestrial systems. Hydrological conditions have significant influence on wetland plant communities and soil biogeochemistry. However, our knowledge about plant-soil interactions in wetlands along hydrological gradients is still limited, although it is crucial to guide wetland management decisions and to adapt, whenever possible, hydrological conditions to the different plant communities. To this aim, we related vegetation composition, plant functional traits, soil physicochemical properties, soil microbial biomass, and soil enzymatic activities in wetlands on the southeastern shore of Neuchâtel lake, Switzerland, a lake whose level is partly regulated. Aboveground and belowground plant biomass and correspondent C, N and P concentrations remained constant or decreased moving from the vegetation community subjected to more frequent flooding events to the community with almost no flooding. The soil organic layer exhibited always higher nutrient concentrations and greater enzymatic activities than the organo-mineral and mineral layers. The chemical and biological characteristics of the soil organic layer showed decreasing values for most of the parameters along the hydrological gradient from lakeshore to upland wetland communities. On the basis of nutrient stoichiometry, plant-soil system in the plant community with most flooding events had no-nutrient limitation, while there was a N limitation in the transitional community. In the upland plant community where there was no flooding effect, the plant-soil system was characterized by N and P co-limitation. These findings are important because they provide a threshold for flooding regime by the lake in the context of optimization of lake level regulation under various stakeholders needs.
Phosphorus is an important nutrient factor to restricts plant growth. However, the influence of phosphorus deficiency on elemental homeostasis and the application of growth rate hypothesis in higher plants remain to be assessed.
Two shrubs, Zygophyllum xanthoxylum and Nitraria tangutorum, were used as experiment materials and subjected to five P addition treatments: 0,17.5, 35, 52.5 and 70mg P kg‐1 soil.
The biomass and relative growth rate of Z. xanthoxylum did not change with altered P supplies. There was no significant difference in P concentration among the treatments for Z. xanthoxylum, but N. tangutorum showed an upward trend. P stoichiometric homeostasis of Z. xanthoxylum was higher than N. tangutorum. For Z. xanthoxylum, available P in rhizosphere were improved significantly under extreme P deficiency conditions and P concentrations in all treatments were lower than N. tangutorum, showing that Z. xanthoxylum had stronger P absorption and P utilization capabilities.
Relationships between growth rate and C:N:P ratios were not found in Z. xanthoxylum. The strong P efficiencies, high and stable dry matter accumulation are likely contributors for maintaining stoichiometric homeostasis. Additionally, the relatively high biomass accumulation and high P utilization efficiency for Z. xanthoxylum does not support growth rate hypothesis for this species.
