title: Altitudinal gradient of microbial biomass phosphorus and its relationship with microbial biomass carbon, nitrogen, and rhizosphere soil phosphorus on the eastern slope of Gongga Mountain, SW China.
abstract: Microbial biomass phosphorus (MBP) is one of the most active forms of phosphorus (P) in soils. MBP plays an important role in the biogeochemical P cycle. To explore MBP distribution and its relationship with other factors, the MBP and rhizosphere soil P concentrations and fractions in six vegetation zones on the eastern slope of Gongga Mountain in SW China were investigated. The MBP distribution followed a parabolic pattern with altitude and the concentration was highest in the subalpine dark coniferous forest (SDC) zone, which was approximately 3500 m above sea level (asl). Below 3500 m asl, the MBP distribution was controlled by precipitation and vegetation type. In addition, temperature, precipitation and vegetation type controlled the MBP distribution at elevations above 3500 m asl. No specific distribution pattern was determined regarding rhizosphere soil P fractions. However, MBP was significantly correlated with the unavailable P fraction in the rhizosphere rather than with the available P fraction. This result suggests that the relationships between the rhizosphere soil P fractions and the MBP depend on time. The microbial biomass element ratios were relatively consistent on the eastern slope of Gongga Mountain. However, variations in the microbial biomass element rations were observed in six of the vegetation zones. The mean C:N:P ratio was 9.0∶1.3∶1. Overall, vegetation type resulted in the observed fluctuations of the microbial biomass element ratio.
authors.affiliation: Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chengdu Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China ; University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, China.
authors.forename: Hongyang
authors.initials: H
authors.lastname: Sun
authors.forename: Yanhong
authors.initials: Y
authors.lastname: Wu
authors.forename: Dong
authors.initials: D
authors.lastname: Yu
authors.forename: Jun
authors.initials: J
authors.lastname: Zhou
mesh_terms: D000531:Altitude; D018533:Biomass; D002244:Carbon / Q000737:chemistry*; D002681:China; D002980:Climate; D005843:Geography; D009584:Nitrogen / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*; D058441:Rhizosphere; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D014197:Trees
chemical_list: D012987:Soil; D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen
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