A Sharp Decline in Nitrogen Input in a N-Saturated Subtropical Forest Causes an Instantaneous Reduction in Nitrogen Leaching

Xie, Danni1; Zhang, Ting2; Yu, Qian1; Huang, Yongmei3; Mulder, Jan4; Duan, Lei1

2018-10

10.1029/2017JG004322

Journal of Geophysical Research-Biogeosciences   影响因子和分区

2169-8953

2169-8961

In China, as in other parts of the world, the emission and deposition of reactive nitrogen (N) have been reduced in recent years. Several decades of elevated N deposition in southwest China (40 to 60kgha(-1)year(-1)) have resulted in extreme cases of N saturation, where N outputs are nearly equal to N inputs. Doubling N inputs using either NH4NO3 or NaNO3 fertilizer in a subtropical forest in Tieshanping, near Chongqing city in southwest China, caused an immediate doubling of N leaching (as NO3-). Reducing N inputs to ambient atmospheric deposition levels after 10years of fertilization led to a rapid decrease in soil water NO3- concentration to levels similar to those in the reference plots that had not receive N fertilizer application. NO3- leaching via the soil water in the NH4NO3 plots was even lower than that in the NaNO3 plots or the reference plots, confirming the finding of a previous N-fertilizing experiment that found that NH4+ deposition, in contrast to NO3- deposition, increased N retention in the forest ecosystem. The N sink remained for at least 2years after the cessation of N addition. Even with reduced N inputs, ambient atmospheric N deposition caused significant acidification, buffered partly by SO42- sorption. Therefore, further abatement of reactive N emissions is necessary in the future.

leaching N saturation acidification recovery

SCI

英语

其他

Tsinghua University Initiative Scientific Research Program[2015Z22029]

Environmental Sciences & Ecology ; Geology

Environmental Sciences ; Geosciences, Multidisciplinary

WOS:000450721000016

AMER GEOPHYSICAL UNION

Web of Science

1.Tsinghua Univ, Sch Environm, State Key Lab Environm Simulat & Pollut Control, Beijing, Peoples R China
2.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen Key Lab Soil & Groundwater Pollut Contro, Shenzhen, Peoples R China
3.Beijing Normal Univ, Fac Geog Sci, Beijing, Peoples R China
4.Norwegian Univ Life Sci, Fac Environm Sci & Nat Resource Management, As, Norway

Xie, Danni,Zhang, Ting,Yu, Qian,et al. A Sharp Decline in Nitrogen Input in a N-Saturated Subtropical Forest Causes an Instantaneous Reduction in Nitrogen Leaching[J]. Journal of Geophysical Research-Biogeosciences,2018,123(10):3320-3330.

Xie, Danni,Zhang, Ting,Yu, Qian,Huang, Yongmei,Mulder, Jan,&Duan, Lei.(2018).A Sharp Decline in Nitrogen Input in a N-Saturated Subtropical Forest Causes an Instantaneous Reduction in Nitrogen Leaching.Journal of Geophysical Research-Biogeosciences,123(10),3320-3330.

Xie, Danni,et al."A Sharp Decline in Nitrogen Input in a N-Saturated Subtropical Forest Causes an Instantaneous Reduction in Nitrogen Leaching".Journal of Geophysical Research-Biogeosciences 123.10(2018):3320-3330.