Impacts of silicon on biogeochemical cycles of carbon and nutrients in croplands

Li, Zi chuan; Song, Zichen; Yang, Xiaoshan; Song, Alin; Yu, Changxun; Wang, Tao; Xia, Shaopan; Liang, Yansheng

doi:10.1016/s2095-3119(18)62018-0

Cited by 32 publications

(64 citation statements)

References 83 publications

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“…In this study, Si concentration in grass was not correlated with N concentration and this is consistent with the result of rice (Klotzbücher et al, 2018;Li et al, 2018b). This effect may be caused by the offset between the "diluting effect" and the promoting influence that cannot be quantified in this study.…”

Section: Impacts Of Si On C N and P Concentrations In Grassessupporting

confidence: 85%

“…In addition to these mechanisms, Si absorption from soil and deposition in grasses could also affect grassland C, N, and P cycles by controlling the synthesis of structural organic compounds and elemental stoichiometry. Increasing evidence shows that Si uptake by plants can enhance the accumulation of C and nutrient elements (Eneji et al, 2008;Song et al, 2014a;Neu et al, 2017;Li et al, 2018b). For example, Li et al (2018a) summarized the positive effects of Si on total C accumulation in plants under different stresses in terrestrial ecosystems and found that Si-mediated recovery could potentially lead to a 35% increase in C accumulation.…”

Section: Implications and Limitation Of The Studymentioning

confidence: 99%

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Silicon Affects Plant Stoichiometry and Accumulation of C, N, and P in Grasslands

et al. 2020

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Silicon (Si) plays an important role in improving soil nutrient availability and plant carbon (C) accumulation and may therefore impact the biogeochemical cycles of C, nitrogen (N), and phosphorus (P) in terrestrial ecosystems profoundly. However, research on this process in grassland ecosystems is scarce, despite the fact that these ecosystems are one of the most significant accumulators of biogenic Si (BSi). In this study, we collected the aboveground parts of four widespread grasses and soil profile samples in northern China and assessed the correlations between Si concentrations and stoichiometry and accumulation of C, N, and P in grasses at the landscape scale. Our results showed that Si concentrations in plants were significantly negatively correlated (p < 0.01) with associated C concentrations. There was no significant correlation between Si and N concentrations. It is worth noting that since the Si concentration increased, the P concentration increased from less than 0.10% to more than 0.20% and therefore C:P and N:P ratios decreased concomitantly. Besides, the soil noncrystalline Si played more important role in C, N, and P accumulation than other environmental factors (e.g., MAT, MAP, and altitude). These findings indicate that Si may facilitate grasses in adjusting the utilization of nutrients (C, N, and P) and may particularly alleviate P deficiency in grasslands. We conclude that Si positively alters the concentrations and accumulation of C, N, and P likely resulting in the variation of ecological stoichiometry in both vegetation and litter decomposition in soils. This study further suggests that the physiological function of Si is an important but overlooked factor in influencing biogeochemical cycles of C and P in grassland ecosystems.

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Section: Impacts Of Si On C N and P Concentrations In Grassessupporting

confidence: 85%

Section: Implications and Limitation Of The Studymentioning

confidence: 99%

Silicon Affects Plant Stoichiometry and Accumulation of C, N, and P in Grasslands

et al. 2020

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“…The processes responsible for the high growth rate observed in sugarcane and crops such as rice, pea, maize and wheat 8 , 9 supplied with Si include mitigating different stresses 10 , 11 , especially those that affect photosynthetic capacity, and improving physiological processes due to nutrient accumulation and use 12 , 13 .…”

Section: Introductionmentioning

confidence: 99%

“…However, some studies have suggested that elements such as Si may affect photosynthetic performance, even in plants grown under stress 20 . Silicon has been reported to increase A and chlorophyll content 9 , 21 , 22 , with significant impacts on leaf N and P content 9 .…”

Section: Introductionmentioning

confidence: 99%

Silicon changes C:N:P stoichiometry of sugarcane and its consequences for photosynthesis, biomass partitioning and plant growth

Frazão

Prado

Rossatto

2020

Sci Rep

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Silicon (Si) application has improved yield and stress tolerance in sugarcane crops. In this respect, C:N:P stoichiometry makes it possible to identify flows and interaction between elements in plants and their relationship with growth. However, few studies have investigated the influence of Si on physiological variables and C:N:P stoichiometry in sugarcane. As such, this study aimed to assess the effect of increasing Si concentrations on the growth and stoichiometric composition of sugarcane plants in the early growth stage. The experiment was conducted in pots, using four Si concentrations (0, 0.8, 1.6 and 3.2 mM). Biomass production, the concentration and accumulation of C, N, P and Si as well as the relationship between them were assessed. Silicon application increased biomass production, the rate of photosynthesis, instantaneous carboxylation efficiency and C, N, P and Si accumulation, in addition to altering stoichiometric ratios (C:N, C:P, N:P and C:Si) in different parts of the plants. The decline in C concentration associated with greater N and P absorption indicates that Si favoured physiological processes, which is reflected in biomass production. Our results demonstrate that Si supply improved carbon use efficiency, directly influencing sugarcane yield as well as C and nutrient cycling.

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“…The application of N + Si had a higher plant abundance and aboveground biomass than N-only. Many studies have reported that Si addition can stimulate higher rates of photo-assimilate translocation, consequently enhancing C sink strength 13,49 . Furthermore, some studies have reported that plants that accumulate Si can increase their competitiveness in herbaceous communities under nutrient-enriched soil, leading to increased abundance of leguminous plants in the community 20,48,50 .…”

Section: Discussionmentioning

confidence: 99%

Silicon addition improves plant productivity and soil nutrient availability without changing the grass:legume ratio response to N fertilization

Gao

Fang

et al. 2020

Sci Rep

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Silicon (Si) plays an important role in plant nutrient capture and absorption, and also promotes plant mechanical strength and light interception in alpine meadows. In this study, we conducted a field experiment to examine the effect of nitrogen (N) application, with (N + Si) and without Si (N-only), on the potential for soil nutrient and the growth of grass and legume plant functional types (pfts) in an alpine meadow. It was found that N + Si resulted in higher soil nutrient contents, leaf N and P concentrations, abundance and biomass of legume and grass PFTs than N-only. The aboveground biomass of grass (598 g m −2) and legume (12.68 g m −2) PFTs under 600 kg ha −1 ammonium nitrate (nH 4 no 3) per year addition with Si was significantly higher than that under the same level of N addition without Si (515 and 8.68 g m −2 , respectively). The grass:legume biomass ratio did not differ significantly between the N + Si and N-only. This demonstrates that Si enhances N fertilization with apparently little effect on grass:legume ratio and increases plant-available nutrients, indicating that Si is essential for the plant community in alpine meadows. Nitrogen (N) is often the primary limiting nutrient for plant growth in terrestrial ecosystems, especially in alpine meadows, where the low temperatures and short growing season limit plant growth and nutrient cycling, and thus N fertilization is widely used in these environments 1-3. Nitrogen fertilization has been reported to influence ecosystems in a variety of ways, including changes in species diversity, biomass production, nutrient availability and soil conditions 1,4-7. Silicon (Si) is important for nutrition and nutrient cycling in soil and plants, especially for grassland environments 8-10. In natural ecosystems, Si fertilization can increase plant growth, plant N use efficiency 7,11-13 and alleviate the loss of biodiversity induced by N addition 6,14. The availability of Si during plant growth not only modifies the concentration of nutrient ions such as N and phosphorus (P) in soils 15-17 , but also strongly affects growth and abundance of grass and legume species in grasslands 16,18-20. Hence, Si could play an important role in plant community composition such as plant abundance and biomass ratios of different plant functional types (PFTs), but has received little research attention 21-23. Legume species are an important PFT in grassland. Legumes not only increase soil N and plant biomass 7,12 , but also maintain a balance of dominance of grass and other non-legume species in plant community. Therefore, management involving mixing legumes with grasses provides economic and environmental benefits and is considered a sustainable intensification in grassland 17,19,24. However, to our knowledge, no studies have examined the impacts of N + Si on soil nutrient ions and growth of grass and legume PFTs (plant abundance, aboveground biomass, leaf N and P concentration) and abundance and biomass grass:legume ratios. In this study, we tested the hypothesis that there are high...

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Impacts of silicon on biogeochemical cycles of carbon and nutrients in croplands

Cited by 32 publications

References 83 publications

Silicon Affects Plant Stoichiometry and Accumulation of C, N, and P in Grasslands

Silicon Affects Plant Stoichiometry and Accumulation of C, N, and P in Grasslands

Silicon changes C:N:P stoichiometry of sugarcane and its consequences for photosynthesis, biomass partitioning and plant growth

Silicon addition improves plant productivity and soil nutrient availability without changing the grass:legume ratio response to N fertilization

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