title: [Spatial variability of soil C/N ratio and its influence factors at a county scale in hilly area of Mid-Sichuan Basin, Southwest China].
abstract: Spatial distribution characteristics of soil C/N ratio and its affecting factors at a county scale in hilly area of Middle Sichuan Basin were analyzed based on field sampling. Result indicated that soil C/N ranged from 4.84 to 21.79, with a mean value of 11.93. The coefficient of variation was 26.3%; which suggested soil C/N had moderate variability in this study area. The ratio of nugget to sill was 73.0%, which suggested the spatial variability of soil C/N was determined by both structural and random factors, and the random factors played a more important role. The soil C/N was higher in northeast and southwest while the central part of the study area was characterized by relatively lower values of soil C/N. The soil C/N ranged from 10.0 to 13.5 in most parts of the study area. Parent material, soil type, topographic factors and land use type had significant impacts on soil C/N (P<0.05). Soil C/N showed a significant positive correlation with elevation and slope (P<0.05). The soil parent materials were able to explain 8.7% of soil C/N spatial variability. The explanatory power of soil group, subgroup and soil genus were 3.8%, 5.0%, 8.7%, respectively. Topographic factors showed the lowest explanatory power of only 0. 8%. However, land use type could explain 23.9% of the spatial variability, which suggested that land use type was the dominant factor in controlling the spatial variability of soil C/N.
authors.forename: You-lin
authors.initials: YL
authors.lastname: Luo
authors.forename: Qi-quan
authors.initials: QQ
authors.lastname: Li
authors.forename: Chang-quan
authors.initials: CQ
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.forename: Lin-xian
authors.initials: LX
authors.lastname: Li
authors.forename: Jun-wei
authors.initials: JW
authors.lastname: Chen
authors.forename: Yu
authors.initials: Y
authors.lastname: Ma
mesh_terms: D002244:Carbon / Q000032:analysis*; D002681:China; D009584:Nitrogen / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D062206:Spatial Analysis
chemical_list: D012987:Soil; D002244:Carbon; D009584:Nitrogen