Long-Term N-15 Balance After Single-Dose Input of N-15-Labeled NH4+ and NO3- in a Subtropical Forest Under Reducing N Deposition

Xie, Danni1; Duan, Lei2,3; Si, Gaoyue4; Liu, Wenjing5; Zhang, Ting6; Mulder, Jan7

2021-07-01

10.1029/2021GB006959

GLOBAL BIOGEOCHEMICAL CYCLES   影响因子和分区

0886-6236

1944-9224

Nitrogen (N) deposition in Europe and North America decreased in the 1990s, whereas N deposition in China began to decline in the early 2010s. The response of temperate forests to decreasing N deposition implied a delay recovery, but it remains unknown whether recovery in subtropical forests follows a similar trend. Therefore, the effects of decreased N deposition on N leaching were simulated in an N-saturated forest in southwest China following ten years of N application 4.00 g N m(-2) yr(-1). The addition of N (NH4+ or NO3-) was stopped in 2014. In 2017, a single in-situ N-15 addition as NH4+ or NO3- was performed to trace the fate of N under reducing N deposition. Combining the monitoring results of the N fluxes and N-15 fates, both the actual N leaching and contribution of a "new" N input to N leaching were significantly reduced in response to decreasing the N input. The termination of N addition resulted in immediate decreases in the N mineralization and immobilization rates, which were even lower than those in the control plots with moderate (naturally occurring) deposition reduction. The ratio of N leaching from mineralization was also reduced, implying the critical role of N mineralization in the recovery from N saturation. Because the forest was still N-saturated, decreasing N deposition slightly reduced the N leaching to the gross N input ratio (including both N deposition and N mineralization). The significant decrease in the ratio and thus leaching recovery may occur due to a significant N deposition reduction.

N-15 tracing method N-15 recovery N deposition reduction N dynamics mineralization immobilization

SCI

英语

其他

National Natural Science Foundation of China[41877329,21607091] ; special fund of State Key Joint Laboratory of Environment Simulation and Pollution Control[19L02ESPC]

Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences

Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences

WOS:000677815700003

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.Changan Univ, Sch Land Engn, Xian, Shaanxi, Peoples R China
2.Tsinghua Univ, Sch Environm, State Key Lab Environm Simulat & Pollut Control, Beijing, Peoples R China
3.State Environm Protect Key Lab Sources & Control, Beijing, Peoples R China
4.Shanghai Jiao Tong Univ, Sch Agr & Biol, Shanghai, Peoples R China
5.East China Normal Univ, Career Dev Ctr, Shanghai, Peoples R China
6.Southern Univ Sci & Technol, Shenzhen Key Lab Soil & Groundwater Pollut Contro, Sch Environm Sci & Engn, Shenzhen, Guangdong, Peoples R China
7.Norwegian Univ Life Sci, Fac Environm Sci & Nat Resource Management, As, Norway

Xie, Danni,Duan, Lei,Si, Gaoyue,et al. Long-Term N-15 Balance After Single-Dose Input of N-15-Labeled NH4+ and NO3- in a Subtropical Forest Under Reducing N Deposition[J]. GLOBAL BIOGEOCHEMICAL CYCLES,2021,35(7).

Xie, Danni,Duan, Lei,Si, Gaoyue,Liu, Wenjing,Zhang, Ting,&Mulder, Jan.(2021).Long-Term N-15 Balance After Single-Dose Input of N-15-Labeled NH4+ and NO3- in a Subtropical Forest Under Reducing N Deposition.GLOBAL BIOGEOCHEMICAL CYCLES,35(7).

Xie, Danni,et al."Long-Term N-15 Balance After Single-Dose Input of N-15-Labeled NH4+ and NO3- in a Subtropical Forest Under Reducing N Deposition".GLOBAL BIOGEOCHEMICAL CYCLES 35.7(2021).