title: [Soil nutrients spatial variability and soil fertility suitability in Qujing tobacco-planting area].
abstract: By adopting GPS technique, 2088 sampling sites were installed in the tobacco-planting area of Qujing City, Yunnan Province, with 0-20 cm soil samples collected to determine their main nutrients contents. The overall characteristics and spatial variability of the tobacco soil nutrients were analyzed by classic statistics and geo-statistics, and the soil fertility suitability in planting tobacco was evaluated by the methods of fuzzy mathematics. In the study area, soil pH and soil organic matter, available S, and water-soluble Cl contents were appropriate, soil total N and alkalihydrolyzable N contents were too high, soil available K, Ca, Mg, Cu, Fe, Zn, Mo, and Mn contents were abundant, soil available P content was at medium level, while soil total P and K and available B contents were insufficient. All the nutrient indices presented anisotropic distribution, among which, the spatial variability of soil available P and B was mainly caused by random factors, and that of other nutrients was caused by the co-effects of structural and random factors. The spatial distribution map of soil fertility suitability index (SFI) showed that there was no the excellent grade region for tobacco-planting, good grade region accounted for 8.0%, general grade region accounted for 51.6%, moderate grade region accounted for 39.0%, and low grade region accounted for 1.4%.
authors.affiliation: Key Laboratory of Tobacco Science & Health, Hunan Agricultural University, Changsha 410128, China. zqiangli@126.com
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
authors.forename: Ji-heng
authors.initials: JH
authors.lastname: Zhou
authors.forename: Rong-sheng
authors.initials: RS
authors.lastname: Yang
authors.forename: Zheng-yan
authors.initials: ZY
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Xie
authors.forename: Yi-yang
authors.initials: YY
authors.lastname: Zhang
authors.forename: Kua-ke
authors.initials: KK
authors.lastname: Huang
authors.forename: Wei
authors.initials: W
authors.lastname: Li
mesh_terms: D002681:China; D017753:Ecosystem; D004784:Environmental Monitoring; D040362:Geographic Information Systems; D008274:Magnesium / Q000032:analysis; D009584:Nitrogen / Q000032:analysis*; D011188:Potassium / Q000032:analysis; D012987:Soil / Q000032:analysis*; D014026:Nicotiana / Q000254:growth & development*
chemical_list: D012987:Soil; D008274:Magnesium; D009584:Nitrogen; D011188:Potassium