title: [Factors influencing the spatial variability in soil respiration under different land use regimes].
abstract: In order to investigate the factors influencing the spatial variability in soil respiration under different land use regimes, field experiments were performed. Soil respiration and relevant environment, vegetation and soil factors were measured. The spatial variability in soil respiration and the relationship between soil respiration and these measured factors were investigated. Results indicated that land use regimes had significant effects on soil respiration. Soil respiration varied significantly (P < 0.001) among different land use regimes. Soil respiration rates ranged from 1.82 to 7.46 micromol x (m2 x s)(-1), with a difference of 5.62 micromol x (m2 x s)(-1) between the highest and lowest respiration rates. Soil organic carbon was a key factor controlling the spatial variability in soil respiration. In all, ecosystems studied, the relationship between soil respiration and soil organic carbon content can be described by a power function. Soil respiration increased with the increase of soil organic carbon. In forest ecosystem, the relationship between soil respiration and diameter at breast height (DBH) of trees can be explained by a natural logarithmic function. A model composed of soil organic carbon (C, %), available phosphorous (AP, g x kg(-1)) and diameter at breast height (DBH, cm) explained 92.8% spatial variability in soil respiration for forest ecosystems.
authors.affiliation: School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China. chenstyf@yahoo.com.cn
authors.forename: Shu-Tao
authors.initials: ST
authors.lastname: Chen
authors.forename: Qiao-Hui
authors.initials: QH
authors.lastname: Liu
authors.forename: Zheng-Hua
authors.initials: ZH
authors.lastname: Hu
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.forename: Jing-Quan
authors.initials: JQ
authors.lastname: Ren
authors.forename: Wei
authors.initials: W
authors.lastname: Xie
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002245:Carbon Dioxide / Q000032:analysis*; D002681:China; D018556:Crops, Agricultural / Q000254:growth & development / Q000378:metabolism; D017753:Ecosystem; D009930:Organic Chemicals / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D012987:Soil / Q000737:chemistry*; D062211:Spatio-Temporal Analysis; D014197:Trees / Q000254:growth & development* / Q000378:metabolism
chemical_list: D009930:Organic Chemicals; D012987:Soil; D002245:Carbon Dioxide; D010758:Phosphorus; D002244:Carbon