title: [Crop-soil nitrogen cycling and soil organic carbon balance in black soil zone of Jilin Province based on DSSAT model].
abstract: By using the CERES-Maize crop model and Century soil model in Decision Support System of Agrotechnology Transfer (DSSAT) model, this paper studied the effects of crop management parameters, fertilizer N application rate, soil initial N supply, and crop residue application on the maize growth, crop-soil N cycling, and soil organic C and N ecological balance in black soil (Mollisol) zone of Jilin Province, Northeast China. Taking 12,000-15,000 kg x hm(-2) as the target yield of maize, the optimum N application rate was 200-240 kg N x hm(-2). Under this fertilization, the aboveground part N uptake was 250-290 kg N x hm(-2), among which, 120-140 kg N x hm(-2) came from soil, and 130-150 kg N x hm(-2) came from fertilizer. Increasing the N application rate (250-420 kg N x hm(-2)) induced an obvious increase of soil residual N (63-183 kg x hm(-2)); delaying the N topdressing date also induced the increase of the residual N. When the crop residue application exceeded 6000 kg x hm(-2), the soil active organic C and N could maintain the supply/demand balance during maize growth season. To achieve the target maize yield and maintain the ecological balance of soil organic C and N in black soil zone of Jilin Province, the chemical N application rate would be controlled in the range of 200-240 kg N x hm(-2), topdressing N should be at proper date, and the application amount of crop residue would be up to 6000 kg x hm(-2).
authors.affiliation: College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China. yangjingmin2001@163.com
authors.forename: Jing-min
authors.initials: JM
authors.lastname: Yang
authors.forename: Sen
authors.initials: S
authors.lastname: Dou
authors.forename: Jing-yi
authors.initials: JY
authors.lastname: Yang
authors.forename: Gerrit
authors.initials: G
authors.lastname: Hoogenboom
authors.forename: Xu
authors.initials: X
authors.lastname: Jiang
authors.forename: Zhong-qing
authors.initials: ZQ
authors.lastname: Zhang
authors.forename: Hong-wei
authors.initials: HW
authors.lastname: Jiang
authors.forename: Li-hui
authors.initials: LH
authors.lastname: Jia
mesh_terms: D000383:Agriculture / Q000379:methods*; D018533:Biomass; D002244:Carbon / Q000032:analysis*; D002681:China; D017753:Ecosystem; D005308:Fertilizers; D008962:Models, Theoretical; D009584:Nitrogen / Q000032:analysis*; D058458:Nitrogen Cycle; D009930:Organic Chemicals / Q000032:analysis; D012987:Soil / Q000032:analysis*; D003313:Zea mays / Q000254:growth & development* / Q000378:metabolism
chemical_list: D005308:Fertilizers; D009930:Organic Chemicals; D012987:Soil; D002244:Carbon; D009584:Nitrogen