Nitrogen and phosphorus additions accelerate decomposition of slow carbon pool and lower total soil organic carbon pool in alpine meadows

Li, Jin Hua; Cheng, Bing Heng; Zhang, Rui; Li, Wen Jin; Shi, Xiaomei; Han, Yong Wei; Ye, Lu Feng; Ostle, Nicholas J.; Bardgett, Richard D.

doi:10.1002/ldr.3824

Cited by 35 publications

(33 citation statements)

References 62 publications

(192 reference statements)

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“…As shown previously, short-term N addition increased the richness and Shannon and McIntosh indices of bacterial and fungal communities in the paddy soil [22]. However, long-term N addition decreased bacterial richness by changing soil pH and plant composition in temperate steppe grassland and increased fungal diversity and relative abundance of complex carbohydrate-decomposing bacterial and fungal groups in alpine meadows [23]. Biogeochemical processes and ecosystem functions are directly associated with altered abundance, diversity, and composition of soil microbial communities [18,24].…”

Section: Introductionsupporting

confidence: 72%

“…Fang et al [69] reported that the decrease in DOC concentration in soil was a consequence of changing microbial decomposition and humidification processes. Soil TP content significantly decreased in the N3 treatment due to the increase in absorption and utilization of TP by plants in a high-N environment [28,67], limiting P availability compared to N [23]. The integrated effect of soil organic carbon stimulation resulted in no significant effect on TC in different N addition treatments.…”

Section: Effects Of Soil Chemical Properties On the Soil Microorganisms Under Nitrogen Addition In Permafrost Peatlandmentioning

confidence: 97%

“…We observed that N1 treatment increased the Ace and Chao indices of bacteria and the Simpson index of fungi in permafrost peatlands. Li et al [23] also reported that N addition increased fungal diversity and differentially affected microbial community composition and structure by modifying microbial preferences in alpine meadows soil. However, these positive effects were different from the results of previous studies, which reported that N addition reduced the bacterial Chao1 index in agricultural grassland and forests soils [56,61] and the fungal Simpson index in forests soils [62].…”

Section: Effects Of N Addition On Soil Microbial Community Composition and Diversity In Permafrost Peatlandmentioning

confidence: 97%

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Effect of Nitrogen Addition on Soil Microbial Functional Gene Abundance and Community Diversity in Permafrost Peatland

Song

et al. 2021

Microorganisms

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Nitrogen is the limiting nutrient for plant growth in peatland ecosystems. Nitrogen addition significantly affects the plant biomass, diversity and community structure in peatlands. However, the response of belowground microbe to nitrogen addition in peatland ecosystems remains largely unknown. In this study, we performed long-term nitrogen addition experiments in a permafrost peatland in the northwest slope of the Great Xing’an Mountains. The four nitrogen addition treatments applied in this study were 0 g N·m−2·year−1 (CK), 6 g N·m−2·year−1 (N1), 12 g N·m−2·year−1 (N2), and 24 g N·m−2·year−1 (N3). Effects of nitrogen addition over a period of nine growing seasons on the soil microbial abundance and community diversity in permafrost peatland were analyzed. The results showed that the abundances of soil bacteria, fungi, archaea, nitrogen-cycling genes (nifH and b-amoA), and mcrA increased in N1, N2, and N3 treatments compared to CK. This indicated that nitrogen addition promoted microbial decomposition of soil organic matter, nitrogen fixation, ammonia oxidation, nitrification, and methane production. Moreover, nitrogen addition altered the microbial community composition. At the phylum level, the relative abundance of Proteobacteria increased significantly in the N2 treatment. However, the relative abundances of Actinobacteria and Verrucifera in the N2 treatment and Patescibacteria in the N1 treatment decreased significantly. The heatmap showed that the dominant order composition of soil bacteria in N1, N2, and N3 treatments and the CK treatment were different, and the dominant order composition of soil fungi in CK and N3 treatments were different. The N1 treatment showed a significant increase in the Ace and Chao indices of bacteria and Simpson index of fungi. The outcomes of this study suggest that nitrogen addition altered the soil microbial abundance, community structure, and diversity, affecting the soil microbial carbon and nitrogen cycling in permafrost peatland. The results are helpful to understand the microbial mediation on ecological processes in response to N addition.

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Section: Introductionsupporting

confidence: 72%

Section: Effects Of Soil Chemical Properties On the Soil Microorganisms Under Nitrogen Addition In Permafrost Peatlandmentioning

confidence: 97%

Section: Effects Of N Addition On Soil Microbial Community Composition and Diversity In Permafrost Peatlandmentioning

confidence: 97%

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Effect of Nitrogen Addition on Soil Microbial Functional Gene Abundance and Community Diversity in Permafrost Peatland

Song

et al. 2021

Microorganisms

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“…The ratio of carbon to nitrogen was higher under the balanced fertilization and low fertilization treatments (Table S5), which contributed to a reduction in the decomposition of crop residue by soil microorganisms and increased the stabilization rate of plant biomass input carbon, thereby improving SOC sequestration (Lu et al, 2011). In addition, N and P enrichment from a high rate of fertilizer application in the long term can accelerate the decomposition of recalcitrant carbon, leading to negative impact on soil carbon sequestration (J. H. Li et al, 2021). This could result in the lower SOC content in conventional fertilization than that in balanced fertilization.…”

Section: Impacts Of Long-term Tillage and Fertilization On Soc Content And Soc Stocksmentioning

confidence: 99%

“…However, the efficacy of mineral fertilization for increasing SOC sequestration has been questioned in recent studies. J. H. Li et al (2021) reported that fertilization with N and/or P increased SOC decomposition and led to a 2%-9% decrease in the SOC stock at the depth of 0-20 cm. The main reason why fertilization increases SOC sequestration is that fertilization promotes crop growth and increases the amount of crop residue returned to the soil (Lu et al, 2011).…”

mentioning

confidence: 99%

Optimization of tillage rotation and fertilization increased the soil organic carbon pool and crop yield in a semiarid region

Zhang

Wang

et al. 2021

Land Degrad Dev

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Tillage and mineral fertilization are important strategies for maintaining crop production, but their effects on soil organic carbon (SOC) and labile fractions in semiarid regions are controversial. A 10-year field experiment was conducted to evaluate the effects of fertilization and tillage on SOC stock, labile fractions, soil quality and crop yields in a wheat-maize cropping system at the Loess Plateau. Results showed that balanced fertilization could provide comprehensive nutrition for crops and increase the crop residue input carbon, thereby increasing the SOC, readily oxidizable carbon, particulate organic carbon and dissolved organic carbon contents. In 0-50 cm layers, the SOC stock was increased by 3% under balanced fertilization compared to conventional fertilization. For tillage, no-tillage (zero tillage) and subsoiling rotation with less soil disturbance and higher stabilization rate of input carbon was the most effective tillage practice for increasing SOC stock. This tillage technique increased the labile carbon contents by 41%-63%, 5%-19% and 26%-67% compared to ploughing in 0-10 cm, 20-35 cm and 35-50 cm layers, respectively. Balanced fertilization combined with no-tillage and subsoiling rotation (BF + NS) increased carbon pool management index due to higher SOC and labile carbon contents, which contributed to the improvement of soil quality and the promotion of crop growth. Among all treatments, BF + NS treatment produced the highest SOC stock as well as wheat and maize yields. Therefore, BF + NS is the best strategy to increase SOC sequestration and to improve soil quality and productivity in semiarid regions.

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Effects of nitrogen and phosphorus fertilization on soil organic matter priming and net carbon balance in alpine meadows

Han

et al. 2023

Land Degrad Dev

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Fertilizers-induced priming effects of soil organic matter (SOM) decomposition influences net carbon balance and nutrient release. We hypothesize that very strong limitation of plant productivity and microbial activities by nitrogen (N) and phosphorus (P), common in Tibetan meadows, retard SOM decomposition and turnover. Consequently, N and/or P fertilization will induce priming effects of SOM and have implications for carbon balance. Soils from a nine-year fertilization experiment (N alone, P alone, NP together, and control) from a Tibetan alpine meadow were used to investigate priming effect of SOM and carbon balance after addition of 13 C labeled glucose.N and/or P fertilization acidified soil by 0.5 pH unit, decreased SOM content, and increased total and available N, total P. Regardless of fertilization, glucose addition accelerated SOM decomposition with priming effects of 30-60 μg C g À1 soil during 78 days. Alleviation of N and P limitation by N and NP fertilization lowered the priming effect by 17% and 14%, respectively, but P fertilization increased priming effect by 67%. The negative correlation of priming effect intensity with SOM, nitrate or total N, and microbial biomass contents indicated that fertilization-induced differences in soil N and the microbial community are responsible for the priming effects.Positive correlation of carbon balance with total N and ammonium contents suggested that soil N accounts for carbon sequestration. Therefore, long-term N and/or P fertilization accelerate SOM decomposition and reduce SOM storage in alpine meadows, of which P fertilization induces the highest priming effect and the lowest SOM storage.

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Nitrogen and phosphorus additions accelerate decomposition of slow carbon pool and lower total soil organic carbon pool in alpine meadows

Cited by 35 publications

References 62 publications

Effect of Nitrogen Addition on Soil Microbial Functional Gene Abundance and Community Diversity in Permafrost Peatland

Effect of Nitrogen Addition on Soil Microbial Functional Gene Abundance and Community Diversity in Permafrost Peatland

Optimization of tillage rotation and fertilization increased the soil organic carbon pool and crop yield in a semiarid region

Effects of nitrogen and phosphorus fertilization on soil organic matter priming and net carbon balance in alpine meadows

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