Nitrogen and phosphorus co-limitation and grazing moderate nitrogen impacts on plant growth and nutrient cycling in sand dune grassland

Ford, Hilary; Roberts, A.H.C.; Jones, Laurence

doi:10.1016/j.scitotenv.2015.10.089

Cited by 41 publications

(15 citation statements)

References 46 publications

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“…In a field study in the Netherlands, vegetation did not respond to N-fertilization at all (Ten Harkel and van der Meulen, 1995). In a field study in Wales, biomass first increased with Nfertilization (Plassmann et al, 2009), but after six years, only with N and P combined (Ford et al, 2016).…”

Section: Nutrient Availability In Different Dune Zonesmentioning

confidence: 97%

“…Also, the response of Grey dunes to high N-deposition partly depends on the chemical status of the soil and availability of P (Kooijman et al 1998;Kooijman and Besse, 2002;Kooijman et al, 2009). The effect of grazing, applied to counteract grass encroachment (Ford et al, 2016), may be determined by soil chemistry as well. Furthermore, cumulative N-deposition, i.e., the total N-deposition cumulated over time, may have led to increased N-levels in the soil, as in forest ecosystems (Mulder et al, 2015), or increased net N-mineralization, as in inland dunes (Sparrius and Kooijman, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen deposition and grass encroachment in calcareous and acidic Grey dunes (H2130) in NW-Europe

Kooijman

Til²,

Noordijk³

et al. 2017

Biological Conservation

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We present an overview of high nitrogen deposition effects on coastal dune grasslands in NW-Europe (H2130), especially concerning grass encroachment in calcareous and acidic Grey Dunes. The problem is larger than previously assumed, because critical loads are still too high, and extra N-input from the sea may amount to 10 kg ha −1 yr −1 . Grass encroachment clearly leads to loss of characteristic plant species, from approximately 16 in open dune grassland to 2 in tall-grass vegetation. Dune zones differ in grass encroachment, due to the chemical status of the soil. In calcareous and iron-rich dunes (Renodunal district), grass encroachment showed a clear gradient over the dune area. Grass encroachment is low in calcareous foredunes, due to low P-availability, and large grazers were not needed to counteract grass encroachment after 2001. In partly decalcified middle dunes, P-availability and grass encroachment are high due to dissolution of calcium phosphates, and grazing only partially helped to control this. In acidic, iron-rich hinterdunes, grass encroachment gradually increased between 1990 and 2014, possibly because P-availability increased with time due to increased soil organic matter content. In acidic, iron-poor dunes (Wadden district), grass encroachment is a large problem, because chemical P-fixation with Ca or Fe does not occur. Large grazers may however reduce tall-grass cover. High cumulative Ndeposition could theoretically lead to increased N-storage and N-mineralization in the soil. Mineralization indeed increased with N-deposition, but in 15 N experiments, most ammonium was converted to nitrate, and storage in soil organic matter was low. Soil N-storage is probably reduced by high nitrate leaching, which will favour dune restoration when N-deposition levels decrease.

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Section: Nutrient Availability In Different Dune Zonesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Nitrogen deposition and grass encroachment in calcareous and acidic Grey dunes (H2130) in NW-Europe

Kooijman

Til²,

Noordijk³

et al. 2017

Biological Conservation

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“…Conversely, the perennial patches provide favorable soils with lower EC and pH but higher SOM for dominant species and forbs, such as L. chinensis, Medicago ruthenica, Thalictrum simplex and Kalimeris integrifolia, which are species demanding relatively rich nutrient and low alkaline-salinity stress levels. Here the higher richness could be interpreted mainly as an effect of abundant organic matter, the limiting factors for plant biomass accumulation (Roem and Berendse 2000;Ford et al 2016). Specifically, the clonal perennial grasses, L. chinensis and P. australis, can respond to habitat heterogeneity by shifting their morphology and architecture (Wang et al 2017).…”

Section: Spatial Pattern Of Plant Variables and Soil Propertiesmentioning

confidence: 99%

Fine-scale characteristics of the boundaries between annual patches and perennial patches in a meadow steppe

et al. 2019

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Context Boundaries are ubiquitous and may have crucial influence on the pattern, process, and dynamics of landscapes. However, there is little understanding of mechanisms that govern changes in the location and composition of boundaries. Especially, it is still uncertain whether there are definite relationships between vegetation and soil. At smaller scales, investigation of more detailed soil and vegetation characteristics can more clearly reveal the linkages between soil properties and vegetation patterns. Objectives We studied fine-scale characteristics of boundaries between two physiognomically distinct patch types, annual patches and perennial patches, in a saline-alkaline grassland. The aims were to examine the relationship between vegetation patterns and soil properties, and to explore mechanisms that govern changes in the location and composition of boundaries. Methods In a 50 ha grassland fenced for more than ten years and where a recovery process had been initiated and where annual grasses were dominating in most salinealkaline areas, we quantitatively characterized the spatial gradients across the visually-identified physiognomic boundary (subsequently adjusted by hierarchical clustering approach) between the annual patches and perennial patches at a fine spatial scale (220 cm × 50 cm transects consisting of 11 quadrats). We statistically defined the boundaries by the Split Moving Window method based on soil and plant variables. We also applied Canonical Correspondence Analysis and Nonmetric Multidimensional Scaling to assess the relationship between the fine-scale functional 3 patterns and soil properties along the studied environmental gradient. Results At fine scale, the vegetation and soil boundaries were well-defined and statistically characterized by a high rate of change, compared to the immediately adjacent areas. The plant characteristics were markedly influenced by soil properties. The alteration of salinity and alkalinity were the most important factors explaining the plant patterns across the patch boundaries. However, physiognomic vegetation boundaries did not fully coincide with the soil boundaries, nor with statisticallydefined boundary in species richness and biomass. There were successional processes of colonization involved in perennials encroachment in the annual patches. Conclusions Underlying soil properties primarily determine the plant patterns of the boundary; the plant succession caused by interspecific competition is superimposed on the plant-soil feedback loop maintaining soil nutrient conditions. These processes ultimately alter the characteristics and locations of patch boundaries in response to changing disturbance regimes. Our findings offer insight into the processes occurring at the boundary and how the boundary may respond to the changes of environmental conditions and drive landscape-level dynamics.

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“…Various factors control the dynamic changes in the content of P fractions, including soil texture (TokuraI et al, 2011), management systems , chemical and organic fertilizers (Liu et al, 2020;Gichangi et al, 2009), and biology (Beutler et al, 2015;Li, 2001). Previous studies have shown that overgrazing may hinder the mineralization of phosphorus (Ford et al, 2016) and reduce its solubility (Sigua et al, 2014). Moreover, Li (2001) reported that long-term grazing reduced the soil P stock-particularly for organic P (Po).…”

Section: Introductionmentioning

confidence: 99%

Effects of Chicken Farming on Soil Phosphorus Availability and Associated Microbial Properties in Lei Bamboo (Phyllostachys praecox) Forest Ecosystems

Gai

Zhang

et al. 2021

Preprint

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Background: Bamboo-chicken farming (BCF) is a popular bamboo complex management model in Southeast Asia owing to its high economic benefits. However, the effects of BCF on phosphorus (P) availability and the associated microbial communities in soil remain poorly understood. In this study, we compared the soil properties, P fractions, phosphatase activities, and bacterial community compositions in the surface soil (0–20 cm) of a typical bamboo (Phyllostachys praecox)-chicken farming system under different grazing densities (represented as distances of 5, 15, 25, and 35 m from the henhouse, respectively). The variables were also compared with the soil measurements from an adjacent pure bamboo forest without chicken framing (control site).Results: We observed a significant increase in soil pH, cation exchange capacity (CEC), total N (TN), total P (TP), and available potassium (AK) with increasing grazing density, while soil organic carbon (SOC) showed no significant difference between the sites. The total P accumulation of the soil was also more rapid than that of SOC and TN with increasing grazing density. Labile P and moderately labile P dominated the soil P accumulation under BCF. In particular, Resin-Pi (labile P), NaHCO3-Pi (labile P), and 1 M HCl-Pi (moderately labile P) increased by 100–233%, 83–183% and 414–1314%, respectively, compared with the control values. In contrast, the contribution of labile or moderately labile organic phosphorus to the total phosphorus (Pt) content decreased significantly with increasing grazing density from 38.54% (control) to 17.65% (5-m site). Phosphatase activity also increased with increasing grazing density, which suggests that BCF effectively promoted the mineralization of soil Po. A redundancy analysis showed that the changes in bacterial community structure were closely related to Resin-Pi and 1 M HCl-Pi (r2 = 0.938 and 0.958, respectively). The relative abundances of the phosphobacteria Flavobacterium, Pseudomonas, Streptomyces, and Arthobacter increased with increasing grazing density, while the abundance of Burkholderia decreased at the 5-m site. Inorganic P (Resin-Pi, NaHCO3-Pi, and 1 M HCl-Pi) was positively correlated with the abundances of Flavobacterium, Pseudomonas, and Arthrobacter but negatively correlated with the abundance of Burkholderia; this highlights the different functional bacteria involved in P cycling. Conclusions: We conclude that BCF generally increases soil P availability and supply, and the changes in the P forms were closely related to the changes in soil bacterial community composition. However, excessive grazing density or long-term BCF practices can cause soil nutrient imbalance, labile and moderately labile P accumulation, and P leaching. Therefore, appropriate grazing densities and/or an interval of no grazing are required under the BCF model for effective and sustainable bamboo forest management.

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Nitrogen and phosphorus co-limitation and grazing moderate nitrogen impacts on plant growth and nutrient cycling in sand dune grassland

Cited by 41 publications

References 46 publications

Nitrogen deposition and grass encroachment in calcareous and acidic Grey dunes (H2130) in NW-Europe

Nitrogen deposition and grass encroachment in calcareous and acidic Grey dunes (H2130) in NW-Europe

Fine-scale characteristics of the boundaries between annual patches and perennial patches in a meadow steppe

Effects of Chicken Farming on Soil Phosphorus Availability and Associated Microbial Properties in Lei Bamboo (Phyllostachys praecox) Forest Ecosystems

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