Soil Eco-stoichiometric Characteristics of Pinus sylvestris var.mongolica Plantation in Hunshandake Sandy Land
In order to clarify the effects of site conditions on the ecological stoichiometry,taking 12-year Pinus syl-vestris var.mongolica plantation with different slope direction,slope degree and slope position in Hunshandake Sandy Land as research object,the soil physical propoties and C,N and P stoichiometric characteristics at a depth of 0-50 cm were measured to sutdy the vertical distribution characteristics of C,N and P and their changing rules in different site conditions.The results showed:(1)The pH value,water content,capillary porosity and non-capillary porosity of flat slope,sunny gentle slope,shady gentle slope,sunny steep slope and shady steep slope decreased with the increase of soil depth.The SOC content decreases with the increase of soil depth.The minimum value of SOC,TN and TP all appeared at the soil layer of 40-50 cm in sunny gentle slope,which was 0.90 g.kg-1,0.08 g.kg-1 and 0.07 g.kg-1,respectively.(2)The variable range of C:N,C:P and N:P of soil in Pinus sylvestris var.mon-golica forest was 0.54-22.31,2.06-73.03 and 0.90-4.86,respectively.The interaction between site conditions and soil depth effected significantly on SOC,TN and TP.(3)There was a significant correlation between soil SOC,TN and C:N,C:P,N:P.The soil ecological stoichiometric ratio of Pinus sylvestris var.mongolica plantation was mainly regulated by SOC and TN.
soil nutrienteco-stoichiometryPinus sylvestris var.mongolica plantationsite conditionsHunshan-dake Sandy Land
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万方数据
