[1]CHEN Hanzhang,LIU Zhizhong.Effects of Simulated Nitrogen Deposition on Litter Decomposition and Soil Microbial Activities in Pinus massoniana Plantations[J].Research of Soil and Water Conservation,2020,27(01):73-80.
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Effects of Simulated Nitrogen Deposition on Litter Decomposition and Soil Microbial Activities in Pinus massoniana Plantations
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 01
Page number:
73-80
Column:
Public date:
2020-02-20
- Title:
- Effects of Simulated Nitrogen Deposition on Litter Decomposition and Soil Microbial Activities in Pinus massoniana Plantations
- Keywords:
- Pinus massoniana plantations; litter decomposition; microbial activities; simulated nitrogen deposition
- CLC:
- S714
- DOI:
- -
- Abstract:
- This study was conducted in Pinus massoniana plantations to measure soil microbial activities and the effects of nitrogen deposition on litter decomposition. Nitrogen addition experiments were carried out within the forest in 2017. Four N addition treatments such as control, No N [CK, 0 kg N/(hm2·a)], low N [LN, 50 kg N/(hm2·a)], medium N [MN, 100 kg N/(hm2·a)] and High N [HN, 150 kg N/(hm2·a)] with three replicates were established in Pinus massoniana plantations. The results showed that:(1)simulated nitrogen deposition had a strong effect on litter decomposition and soil microbial activities in Pinus massoniana plantations; the litter decomposition coefficient increased at first and then decreased, and the largest litter decomposition coefficient was found in treatment of MN; the litter decomposition coefficients of treatments of LN, MN and HN increased by 15.36%, 56.89% and 12.97%, respectively, compared with CK;(2)simulated nitrogen deposition promoted soil microbial biomass carbon, nitrogen, phosphorus, which increased at first and then decreased, and the highest soil microbial biomass was observed in the treatment of MN;(3)simulated nitrogen deposition increased soil enzyme activity, soil enzyme activity was inhibited in the treatment of HN; the soil enzyme activity related to carbon, nitrogen, phosphorus increased at first and then decreased, and the highest soil enzyme activity was found in the treatment of MN;(4)soil microbial activity, microbial metabolic entropy, autotrophic respiration, heterotrophic respiration, total respiration showed the same change trend, which increased at first and then decreased, and the greatest values of these indicators were found in the treatment of MN;(5)correlation analysis indicated that there was a significant positive correlation between the decomposition coefficient of litter and the soil microbial biomass carbon, nitrogen, microbial activity, microbial metabolic entropy and total microbial respiration; soil microbial respiration and soil microbial metabolic entropy significantly reflected their microbial characteristics, among which soil carbon cycle enzyme, microbial activity and soil microbial metabolic entropy had the important contribution to the decomposition of litter.
- References:
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Last Update:
2020-02-25