Response of nitrogen transformation to glucose additions in soils at two subtropical forest types subjected to simulated nitrogen deposition

Hongliang Ma, Yunfeng Yin, Ren Gao, Raza Taqi, Xinhua He

Research output: Contribution to journalArticle

Abstract

Purpose Soil nitrogen (N) transformation is an important phenomenon in forest ecosystems and it is regulated by carbon (C) input. This study aimed to evaluate the impacts of labile C levels on soil N mineralization under different simulated N deposition rates.

Materials and methods Soils at 0-15-cm depth were collected from two contrasting subtropical forests, a coniferous fir forest (CFF) and an evergreen broadleaf forest (EBF); both soils had been subjected to 3 years of artificial NH4NO3 input or deposition (no-N control, N-0; low N (30kg N ha(-1) year(-1); N30), and high N (100 kg N ha(-1) year(-1)); N100). The impacts of external glucose-C (G) on N mineralization of these N-deposited soils were investigated by the addition of six C rates (mg C kg(-1) dry weight soil-0, G0; 100, G100; 300, G300; 1000, G1000; 2000, G2000; and 5000, G5000), at a temperature of 25 degrees C, and a 60% water-holding capacity for 21 days.

Results and discussion The results showed that, after 21days of incubation, concentrations of inorganic N (NH4+-N and NO3--N) decreased significantly (P <0.05) with increasing C rates and reached a minimum value when the added C rate was G1000. The lowest NH4+-N under G1000 was 9.2 mg kg(-1) in all of these three N-deposited soils at the CFF site while 11.6 mg kg(-1) in the N30 soil at the EBF site. The concentration of NO3- -N was decreased to 0 under G1000 and G2000 in the CFF and EBF soils, respectively. These results revealed that the higher the soil NO3--N concentration was, the greater the NO3--N reduced, with a maximum decrease of 80 mg NO3--N kg(-1) in the N100 soil from the EBF site. In addition, the soil mineralization and nitrification rates were significantly higher (P

Conclusions Our results suggested that there could be a critical C level at which N transformation being altered in certain soils, based on their N status, and that the impacts of C on soil N mineralization were independent of soil N availability.

Original languageEnglish
Pages (from-to)2166-2175
Number of pages10
JournalJournal of Soils and Sediments
Volume19
Issue number5
DOIs
Publication statusPublished - May 2019

Cite this

@article{a556f794539a4b6b9f1b8259454d9165,
title = "Response of nitrogen transformation to glucose additions in soils at two subtropical forest types subjected to simulated nitrogen deposition",
abstract = "Purpose Soil nitrogen (N) transformation is an important phenomenon in forest ecosystems and it is regulated by carbon (C) input. This study aimed to evaluate the impacts of labile C levels on soil N mineralization under different simulated N deposition rates.Materials and methods Soils at 0-15-cm depth were collected from two contrasting subtropical forests, a coniferous fir forest (CFF) and an evergreen broadleaf forest (EBF); both soils had been subjected to 3 years of artificial NH4NO3 input or deposition (no-N control, N-0; low N (30kg N ha(-1) year(-1); N30), and high N (100 kg N ha(-1) year(-1)); N100). The impacts of external glucose-C (G) on N mineralization of these N-deposited soils were investigated by the addition of six C rates (mg C kg(-1) dry weight soil-0, G0; 100, G100; 300, G300; 1000, G1000; 2000, G2000; and 5000, G5000), at a temperature of 25 degrees C, and a 60{\%} water-holding capacity for 21 days.Results and discussion The results showed that, after 21days of incubation, concentrations of inorganic N (NH4+-N and NO3--N) decreased significantly (P <0.05) with increasing C rates and reached a minimum value when the added C rate was G1000. The lowest NH4+-N under G1000 was 9.2 mg kg(-1) in all of these three N-deposited soils at the CFF site while 11.6 mg kg(-1) in the N30 soil at the EBF site. The concentration of NO3- -N was decreased to 0 under G1000 and G2000 in the CFF and EBF soils, respectively. These results revealed that the higher the soil NO3--N concentration was, the greater the NO3--N reduced, with a maximum decrease of 80 mg NO3--N kg(-1) in the N100 soil from the EBF site. In addition, the soil mineralization and nitrification rates were significantly higher (PConclusions Our results suggested that there could be a critical C level at which N transformation being altered in certain soils, based on their N status, and that the impacts of C on soil N mineralization were independent of soil N availability.",
keywords = "Carbon level, Forest soil, Nitrogen deposition, Nitrate immobilization, Nitrogen transformation, ORGANIC-CARBON, MICROBIAL IMMOBILIZATION, LEAF-LITTER, NITRATE, MINERALIZATION, NITRIFICATION, DYNAMICS, AMMONIUM, DENITRIFICATION, CONSERVATION",
author = "Hongliang Ma and Yunfeng Yin and Ren Gao and Raza Taqi and Xinhua He",
year = "2019",
month = "5",
doi = "10.1007/s11368-018-02237-8",
language = "English",
volume = "19",
pages = "2166--2175",
journal = "Journal of Soils and Sediments: protection, risk assessment and remediation",
issn = "1439-0108",
publisher = "Springer Heidelberg",
number = "5",

}

Response of nitrogen transformation to glucose additions in soils at two subtropical forest types subjected to simulated nitrogen deposition. / Ma, Hongliang; Yin, Yunfeng; Gao, Ren; Taqi, Raza; He, Xinhua.

In: Journal of Soils and Sediments, Vol. 19, No. 5, 05.2019, p. 2166-2175.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Response of nitrogen transformation to glucose additions in soils at two subtropical forest types subjected to simulated nitrogen deposition

AU - Ma, Hongliang

AU - Yin, Yunfeng

AU - Gao, Ren

AU - Taqi, Raza

AU - He, Xinhua

PY - 2019/5

Y1 - 2019/5

N2 - Purpose Soil nitrogen (N) transformation is an important phenomenon in forest ecosystems and it is regulated by carbon (C) input. This study aimed to evaluate the impacts of labile C levels on soil N mineralization under different simulated N deposition rates.Materials and methods Soils at 0-15-cm depth were collected from two contrasting subtropical forests, a coniferous fir forest (CFF) and an evergreen broadleaf forest (EBF); both soils had been subjected to 3 years of artificial NH4NO3 input or deposition (no-N control, N-0; low N (30kg N ha(-1) year(-1); N30), and high N (100 kg N ha(-1) year(-1)); N100). The impacts of external glucose-C (G) on N mineralization of these N-deposited soils were investigated by the addition of six C rates (mg C kg(-1) dry weight soil-0, G0; 100, G100; 300, G300; 1000, G1000; 2000, G2000; and 5000, G5000), at a temperature of 25 degrees C, and a 60% water-holding capacity for 21 days.Results and discussion The results showed that, after 21days of incubation, concentrations of inorganic N (NH4+-N and NO3--N) decreased significantly (P <0.05) with increasing C rates and reached a minimum value when the added C rate was G1000. The lowest NH4+-N under G1000 was 9.2 mg kg(-1) in all of these three N-deposited soils at the CFF site while 11.6 mg kg(-1) in the N30 soil at the EBF site. The concentration of NO3- -N was decreased to 0 under G1000 and G2000 in the CFF and EBF soils, respectively. These results revealed that the higher the soil NO3--N concentration was, the greater the NO3--N reduced, with a maximum decrease of 80 mg NO3--N kg(-1) in the N100 soil from the EBF site. In addition, the soil mineralization and nitrification rates were significantly higher (PConclusions Our results suggested that there could be a critical C level at which N transformation being altered in certain soils, based on their N status, and that the impacts of C on soil N mineralization were independent of soil N availability.

AB - Purpose Soil nitrogen (N) transformation is an important phenomenon in forest ecosystems and it is regulated by carbon (C) input. This study aimed to evaluate the impacts of labile C levels on soil N mineralization under different simulated N deposition rates.Materials and methods Soils at 0-15-cm depth were collected from two contrasting subtropical forests, a coniferous fir forest (CFF) and an evergreen broadleaf forest (EBF); both soils had been subjected to 3 years of artificial NH4NO3 input or deposition (no-N control, N-0; low N (30kg N ha(-1) year(-1); N30), and high N (100 kg N ha(-1) year(-1)); N100). The impacts of external glucose-C (G) on N mineralization of these N-deposited soils were investigated by the addition of six C rates (mg C kg(-1) dry weight soil-0, G0; 100, G100; 300, G300; 1000, G1000; 2000, G2000; and 5000, G5000), at a temperature of 25 degrees C, and a 60% water-holding capacity for 21 days.Results and discussion The results showed that, after 21days of incubation, concentrations of inorganic N (NH4+-N and NO3--N) decreased significantly (P <0.05) with increasing C rates and reached a minimum value when the added C rate was G1000. The lowest NH4+-N under G1000 was 9.2 mg kg(-1) in all of these three N-deposited soils at the CFF site while 11.6 mg kg(-1) in the N30 soil at the EBF site. The concentration of NO3- -N was decreased to 0 under G1000 and G2000 in the CFF and EBF soils, respectively. These results revealed that the higher the soil NO3--N concentration was, the greater the NO3--N reduced, with a maximum decrease of 80 mg NO3--N kg(-1) in the N100 soil from the EBF site. In addition, the soil mineralization and nitrification rates were significantly higher (PConclusions Our results suggested that there could be a critical C level at which N transformation being altered in certain soils, based on their N status, and that the impacts of C on soil N mineralization were independent of soil N availability.

KW - Carbon level

KW - Forest soil

KW - Nitrogen deposition

KW - Nitrate immobilization

KW - Nitrogen transformation

KW - ORGANIC-CARBON

KW - MICROBIAL IMMOBILIZATION

KW - LEAF-LITTER

KW - NITRATE

KW - MINERALIZATION

KW - NITRIFICATION

KW - DYNAMICS

KW - AMMONIUM

KW - DENITRIFICATION

KW - CONSERVATION

U2 - 10.1007/s11368-018-02237-8

DO - 10.1007/s11368-018-02237-8

M3 - Article

VL - 19

SP - 2166

EP - 2175

JO - Journal of Soils and Sediments: protection, risk assessment and remediation

JF - Journal of Soils and Sediments: protection, risk assessment and remediation

SN - 1439-0108

IS - 5

ER -