Key nitrogen cycling processes in pine plantations along a short urban–rural gradient in Nanchang, China

Chen, Fusheng; Fahey, Timothy J.; Yu, Ming-yuan; Gan, Lei

doi:10.1016/j.foreco.2009.11.003

Cited by 42 publications

(26 citation statements)

References 47 publications

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“…Nitrate was always dominated in soil inorganic N in urbanized (urban and urban/suburban) sites (Table 2), similar results were reported that nitrate was elevated nearer to the urban core [13] and was dominant N form in urban areas [11,12]. Urbanization producing various urban sources of nitrate and resulting in nitrate enrichment of atmospheric N deposition (> 30 kg N ha -1 yr -1 , Huang et al, 2015a) contributed greatly to soil dominated nitrate.…”

Section: Nitrate Enriching In Urbanized Areassupporting

confidence: 79%

“…Obviously, soil inorganic N availability is not immune to urbanization. The research showed that urbanization increases soil inorganic N availability [11,12], especial for nitrate, which always dominated in urban soils [11] and exhibits an increase pattern from rural to urban core [13].…”

Section: Introductionmentioning

confidence: 95%

“…Enriched nitrate occurs in urban areas suggested potential N loss and N saturation [12,20]. N saturation is a condition where N input to the ecosystems exceeds plant and microbial demand [21].…”

Section: Introductionmentioning

confidence: 99%

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Responses of Inorganic Nitrogen of Forest Soils to Urbanization in Pearl River Delta, South China

Huang¹,

Mo²,

Chen³

2017

dteees

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Abstract. Urbanization results in high N deposition and impacts N cycling of forest ecosystems, which increases soil inorganic N pool, including soil N availability, especially for nitrate. However, it is still unknown it is true in south China where ammonium always dominates in soils for long-term traditional agricultural activities. We investigated the changes in soil inorganic N availability responding to urbanization in Pearl River Delta (PRD), China, one of the largest urban areas of the world. Soil total inorganic N levels did not show an obvious growth in urbanized (urban and urban/suburban) sites compared with non-urbanized (suburban/rural and rural) sites based on non-significant differences in their concentrations, but nitrate enriched. Our study demonstrated that urbanization resulting in extra N input does not significantly enhance soil total inorganic N availability instead of the changes in its composition, indicating that N cycling in this region is accelerated and its N status is N-rich even N-saturated, consequently potential ecological risks might happen, including nitrate leaching, eutrophication, and plant preference for nitrate. Therein N pollution dominated by nitrate should be paid special attention in China.

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Section: Nitrate Enriching In Urbanized Areassupporting

confidence: 79%

Section: Introductionmentioning

confidence: 95%

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Responses of Inorganic Nitrogen of Forest Soils to Urbanization in Pearl River Delta, South China

Huang¹,

Mo²,

Chen³

2017

dteees

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“…N is a key nutrient required by all living organisms, which controlling the species composition, diversity, dynamics and function of many terrestrial ecosystems (Vitousek et al 1997;Chen et al 2010;Geisseler et al 2010). However, urban soil sealing alternated the biotic and abiotic factors that regulating N transformation and seriously affected soil N pool and flux (Lorenz and Lal 2009).…”

Section: Introductionmentioning

confidence: 99%

Effect of soil sealing on the microbial biomass, N transformation and related enzyme activities at various depths of soils in urban area of Beijing, China

et al. 2012

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“…The total metropolitan area is 7,402 km 2 with a population that increased from 2.4 million in 1970, to 4.0 million in 1996 and 4.8 million in 2009. The number of motor vehicles increased almost 8-fold between 1995 and 2006 (Chen et al 2010a). The study region has a subtropical monsoon climate (wet and mild) with mean annual precipitation of about 1700 mm and mean annual relative humidity of about 77%.…”

Section: Study Areamentioning

confidence: 99%

Soil phosphorus fractions and tree phosphorus resorption in pine forests along an urban-to-rural gradient in Nanchang, China

Chen

Nagle

et al. 2011

Plant Soil

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Urbanization has been rapid across the world but the responses of phosphorus (P) cycling to urbanization have not been well-investigated. This study was to understand the influences of rapid urbanization on forest P cycling in a developing country. Soil P fractions and P resportion were determined for nine slash pine (Pinus elliottii Engelm.) forests along a 30-km long urban-suburban-rural gradient in Nanchang City, southern China. The total P stocks in the surface soils in urban and suburban forests were 317% and 182% higher, respectively, than levels found in rural forests. The concentrations of soil available P, labile P, slow P, occluded P and total extractable P were also much higher in urban and suburban forests than in rural forests (P<0.05). Soil weathered P concentrations were highest in urban forests. Annual mean foliar P concentrations were enhanced in urban and suburban forests compared to rural forests. The P resorption efficiency (PRE) was higher in rural forests than in suburban and urban forests, while the P resorption proficiency (PRP) was lower in rural forests than in suburban and urban forests. Urbanization associated with high extraneous P inputs has altered soil P status and plant P uptake. Foliar P concentration, PRE and PRP were largely dependent on soil P availability in our study forests.

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Key nitrogen cycling processes in pine plantations along a short urban–rural gradient in Nanchang, China

Cited by 42 publications

References 47 publications

Responses of Inorganic Nitrogen of Forest Soils to Urbanization in Pearl River Delta, South China

Responses of Inorganic Nitrogen of Forest Soils to Urbanization in Pearl River Delta, South China

Effect of soil sealing on the microbial biomass, N transformation and related enzyme activities at various depths of soils in urban area of Beijing, China

Soil phosphorus fractions and tree phosphorus resorption in pine forests along an urban-to-rural gradient in Nanchang, China

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