Effects of nitrogen addition on soil aggregate distribution and carbon and nitrogen contents in alpine meadow

Yang Jiaming; Hu Jian; Pan Junxiao; Peng Yifei; Wei Chunxue; Wang Jinsong; Tian Dashuan; Zhou Qingping

doi:10.12171/j.1000-1522.20210439

Journal of Beijing Forestry University > 2022 > 44(12): 102-110. > DOI: 10.12171/j.1000-1522.20210439

Yang Jiaming, Hu Jian, Pan Junxiao, Peng Yifei, Wei Chunxue, Wang Jinsong, Tian Dashuan, Zhou Qingping. Effects of nitrogen addition on soil aggregate distribution and carbon and nitrogen contents in alpine meadow[J]. Journal of Beijing Forestry University, 2022, 44(12): 102-110. DOI: 10.12171/j.1000-1522.20210439

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Effects of nitrogen addition on soil aggregate distribution and carbon and nitrogen contents in alpine meadow

1.
Institute of Qinghai-Tibet Plateau, Southwest Minzu University, Chengdu 610041, Sichuan, China
2.
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
3.
School of Resources and Environmental Sciences, Hebei Agricultural University, Baoding 071000, Hebei, China

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Received Date: November 03, 2021
Revised Date: March 05, 2022
Accepted Date: May 06, 2022
Available Online: May 06, 2022
Published Date: December 24, 2023

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Abstract

Abstract

Objective This study aims to investigate the response characteristics of soil aggregate distribution and carbon (C) and nitrogen (N) contents under different N addition conditions in order to provide data support for soil C sequestration mechanism in alpine meadow under the background of N deposition.
Method In 2014, a long-term N addition platform was established in an alpine meadow on the Qinghai-Tibet Plateau of western China. A completely randomized block design was used to simulate N deposition with six N addition levels: 0 g/(m²·year) (N0, control), 2 g/(m²·year) (N2), 4 g/(m²·year) (N4), 8 g/(m²·year) (N8), 16 g/(m²·year) (N16), 32 g/(m²·year) (N32). Macroaggregates (0.25−2 mm), microaggregates (0.053−0.25 mm), silt and clay (< 0.053 mm) were obtained by wet sieving method, and the organic C and total N contents of soil aggregates were determined.
Result The mass proportion of macroaggregates (79%) was significantly higher than that of silt and clay (13%) and microaggregates (8%) (P < 0.05). There was no significant difference in the distribution of soil aggregates under different N addition gradients (P > 0.05), whereas the mean mass diameter of soil aggregates did not change with N addition (P > 0.05), which could attribute to the trade off between the positive effect of N addition on root biomass and the decreased microbial activity. Moreover, N addition decreased the organic C content of macroaggregates and microaggregates, but increased the organic C content of silt and clay (P > 0.05). Compared with the control, nitrogen addition reduced the total nitrogen content of microaggregates and clay particles by 2% and 12%, respectively (P > 0.05). The C/N ratio of all aggregates significantly decreased under N addition (P < 0.05).
Conclusion The C/N ratios of different size of soil aggregate decreased, indicating the acceleration of SOC mineralization in alpine meadow under increased N deposition.
- alpine meadow,
- soil aggregates,
- mean mass diameter,
- organic carbon,
- total nitrogen,
- C/N ratio

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