title: Nitrate leaching, direct and indirect nitrous oxide fluxes from sloping cropland in the purple soil area, southwestern China.
abstract: This study provides a combined dataset on N loss pathways and fluxes from sloping cropland in the purple soil area, southwestern China. A lysimeter experiment was conducted to quantify nitrate leaching (May 2004-May 2010) and N(2)O emission (May 2009-May 2010) losses. Nitrate leaching was the dominant N loss pathway and annual leaching fluxes ranged from 19.2 to 53.4 kg N ha(-1), with significant differences between individual observation years (P < 0.05). Direct N(2)O emissions due to N fertilizer use were 1.72 ± 0.34 kg N ha(-1) yr(-1), which corresponds to an emission factor of 0.58 ± 0.12%. However, indirect N(2)O emissions caused by nitrate leaching and surface runoff N losses, may contribute another 0.15-0.42 kg N ha(-1) yr(-1). Our study shows that nitrate leaching lowered direct N(2)O emissions, highlighting the importance for a better understanding of the tradeoff between direct and indirect N(2)O emissions for the development of meaningful N(2)O emission strategies.
authors.affiliation: Key Laboratory of Mountain Environment Evolvement and Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China.
authors.forename: Minghua
authors.initials: M
authors.lastname: Zhou
authors.forename: Bo
authors.initials: B
authors.lastname: Zhu
authors.forename: Klaus
authors.initials: K
authors.lastname: Butterbach-Bahl
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.forename: Jessica
authors.initials: J
authors.lastname: Bergmann
authors.forename: Nicolas
authors.initials: N
authors.lastname: Brüggemann
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Wang
authors.forename: Taikui
authors.initials: T
authors.lastname: Li
authors.forename: Fuhong
authors.initials: F
authors.lastname: Kuang
mesh_terms: D002681:China; D004784:Environmental Monitoring; D005308:Fertilizers / Q000032:analysis; D009566:Nitrates / Q000032:analysis*; D058458:Nitrogen Cycle; D009609:Nitrous Oxide / Q000032:analysis*; D012987:Soil / Q000032:analysis*
chemical_list: D005308:Fertilizers; D009566:Nitrates; D012987:Soil; D009609:Nitrous Oxide