杉木第3代种子园土壤CNP化学计量特征

以福建省沙县官庄国有林场杉木第3代种子园为研究对象,在区分高中低产区的基础上,分析了各产量小区中CNP化学计量特征。结果显示,CNP元素的含量随着产量减少而减少,在高产小区表现为最大。CN比值和CP比值只在0～20cm土壤层中表现为高产显著大于中产或低产,其他化学计量比值在20～40 cm和40～60 cm土层中没有发现显著差异。CP比值的范围明显大于CN比值和NP比值。相对高的CP和NP比值说明杉木种子园土壤可能缺乏P元素。

Soil CNP Stoichiometry Characteristics of 3rd Generation Seed Orchard of Cunninghamia lanceolata

Taking the third generation seed orchard of Cunninghamia lanceolata in Sanming,Fujian as the research object,CNP stoichiometry characteristics were analysed on the base of dividing into high,middle and low production plots.The results showed that concentrations of CNP were decreased along with the decrease of production amount.The highest CNP concentrations were highest in the high production plots.C: N and C: P ratios were found larger in 0-20cm deep soil layer of high production plots.The other stoichiometry ratio significant difference were not found in 20-40 and 40-60 cm deep soil layers.C: P ratios were larger than C: N and N: P ratios.Higher C: P and N: P ratios indicated that seed orchard of Cunninghamia lanceolata might be lack of P element.But evaluating the soil nutrients status and production stability with stoichiometry characteristics needed to combine plant component nutrient status to make a further research.