Soil microbial properties under N and P additions in a semi-arid, sandy grassland

Li, Lu-Jun; Zeng, De‐Hui; Yu, Zhan-Yuan; Fan, Zhiping; Mao, Rong

doi:10.1007/s00374-010-0463-y

Cited by 41 publications

(32 citation statements)

References 27 publications

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“…The increased soil organic C only appeared in 10 g m −2 yr −1 of N, P and 15 g m −2 yr −1 of N+P compared to control. The increase in soil organic C agreed with previous studies, which showed that N and P additions significantly enhanced C stocks and C sequestration in grassland soils [34], [49]–[51]. In our study, plant community biomass increased and grasses accounted for 70% of the total biomass in eight of nine fertilization treatments.…”

Section: Discussionsupporting

confidence: 92%

Effects of Nitrogen and Phosphorus Fertilization on Soil Carbon Fractions in Alpine Meadows on the Qinghai-Tibetan Plateau

et al. 2014

PLoS ONE

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In grassland ecosystems, N and P fertilization often increase plant productivity, but there is no concensus if fertilization affects soil C fractions. We tested effects of N, P and N+P fertilization at 5, 10, 15 g m−2 yr−1 (N5, N10, N15, P5, P10, P15, N5P5, N10P10, and N15P15) compared to unfertilized control on soil C, soil microbial biomass and functional diversity at the 0–20 cm and 20–40 cm depth in an alpine meadow after 5 years of continuous fertilization. Fertilization increased total aboveground biomass of community and grass but decreased legume and forb biomass compared to no fertilization. All fertilization treatments decreased the C:N ratios of legumes and roots compared to control, however fertilization at rates of 5 and 15 g m−2 yr−1 decreased the C:N ratios of the grasses. Compared to the control, soil microbial biomass C increased in N5, N10, P5, and P10 in 0–20 cm, and increased in N10 and P5 while decreased in other treatments in 20–40 cm. Most of the fertilization treatments decreased the respiratory quotient (qCO2) in 0–20 cm but increased qCO2 in 20–40 cm. Fertilization increased soil microbial functional diversity (except N15) but decreased cumulative C mineralization (except in N15 in 0–20 cm and N5 in 20–40 cm). Soil organic C (SOC) decreased in P5 and P15 in 0–20 cm and for most of the fertilization treatments (except N15P15) in 20–40 cm. Overall, these results suggested that soils will not be a C sink (except N15P15). Nitrogen and phosphorus fertilization may lower the SOC pool by altering the plant biomass composition, especially the C:N ratios of different plant functional groups, and modifying C substrate utilization patterns of soil microbial communities. The N+P fertilization at 15 g m−2 yr−1 may be used in increasing plant aboveground biomass and soil C accumulation under these meadows.

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Section: Discussionsupporting

confidence: 92%

Effects of Nitrogen and Phosphorus Fertilization on Soil Carbon Fractions in Alpine Meadows on the Qinghai-Tibetan Plateau

et al. 2014

PLoS ONE

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“…It has widely been documented that nutrient enrichment usually alters botanical composition and productivity of plant community (Matson et al, 2002;Snyman, 2002;Knorr et al, 2005). Also, our previous studies from the same site showed that N addition led to dramatic changes in vegetation composition and species diversity (Zeng et al, 2010a), and that N and P fertilizations significantly changed soil physicochemical and microbial properties (Li et al, 2010). Thus, both indirect effects of shifts in species composition/dominance and direct changes in soil nutrient availability under nutrient enrichment will affect litter decomposition and subsequently change C and nutrient cycling of ecosystem.…”

Section: Discussionmentioning

confidence: 92%

Impact of litter quality and soil nutrient availability on leaf decomposition rate in a semi-arid grassland of Northeast China

Zeng

et al. 2011

Journal of Arid Environments

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“…However, excessive N input has negative effects on microbial activity. Many studies have reported that long-term nitrogen deposition reduced soil MBC2526. Nitrogen saturation induced by excess N input can decrease soil pH, leading to leaching of magnesium and calcium and mobilization of aluminum45.…”

Section: Discussionmentioning

confidence: 99%

Nitrogen deposition and management practices increase soil microbial biomass carbon but decrease diversity in Moso bamboo plantations

Quan

Song

et al. 2016

Sci Rep

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Because microbial communities play a key role in carbon (C) and nitrogen (N) cycling, changes in the soil microbial community may directly affect ecosystem functioning. However, the effects of N deposition and management practices on soil microbes are still poorly understood. We studied the effects of these two factors on soil microbial biomass carbon (MBC) and community composition in Moso bamboo plantations using high-throughput sequencing of the 16S rRNA gene. Plantations under conventional (CM) or intensive management (IM) were subjected to one of four N treatments for 30 months. IM and N addition, both separately and in combination, significantly increased soil MBC while decreasing bacterial diversity. However, increases in soil MBC were inhibited when N addition exceeded 60 kg N∙ha−1∙yr−1. IM increased the relative abundances of Actinobacteria and Crenarchaeota but decreased that of Acidobacteria. N addition increased the relative abundances of Acidobacteria, Crenarchaeota, and Actinobacteria but decreased that of Proteobacteria. Soil bacterial diversity was significantly related to soil pH, C/N ratio, and nitrogen and available phosphorus content. Management practices exerted a greater influence over regulation of the soil MBC and microbial diversity compared to that of N deposition in Moso bamboo plantations.

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Soil microbial properties under N and P additions in a semi-arid, sandy grassland

Cited by 41 publications

References 27 publications

Effects of Nitrogen and Phosphorus Fertilization on Soil Carbon Fractions in Alpine Meadows on the Qinghai-Tibetan Plateau

Effects of Nitrogen and Phosphorus Fertilization on Soil Carbon Fractions in Alpine Meadows on the Qinghai-Tibetan Plateau

Impact of litter quality and soil nutrient availability on leaf decomposition rate in a semi-arid grassland of Northeast China

Nitrogen deposition and management practices increase soil microbial biomass carbon but decrease diversity in Moso bamboo plantations

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