武功山山地草甸不同海拔凋落物-土壤碳、氮、磷含量及其生态化学计量特征

Carbon,nitrogen and phosphorus contents and their ecological stoichiometry in litters and soils on meadow of Wugong Mountain,Jiangxi,China at different altitudes

以江西省武功山海拔1500~1900 m山地草甸为研究对象,研究不同海拔凋落物-土壤碳(C)、氮(N)、磷(P)含量及生态化学计量特征,并对其相关性进行分析.结果表明:不同海拔下凋落物C、N、P含量分别为397.5~458.24、11.59~17.12、1.05~2.19 mg·g^(-1),凋落物C含量随海拔升高不断减小,凋落物N、P含量随海拔升高先下降后升高.土壤C、N、P含量分别为51.64~80.01、3.30~4.77、0.44~1.09 mg·g^(-1),土壤C、N、P含量随海拔升高先增加后降低,土壤全P含量变异较小.不同海拔凋落物C∶N、C∶P、N∶P分别为24.73~40.36、203.65~463.08、7.16~13.80,并随海拔升高先升高后下降.不同海拔土壤C∶N、C∶P、N∶P分别为14.95~16.95、56.87~162.52、3.69~10.58,土壤C∶N随海拔升高没有显著变化,土壤C∶P、N∶P随海拔升高先升高后下降,在海拔1600~1700 m处达到最大.武功山山地草甸凋落物与土壤C、N、P含量随海拔升高的变化规律不同,不同海拔凋落物C、N、P均值,以及C∶N、C∶P和N∶P大于土壤.

Carbon(C）,nitrogen(N） and phosphorus(P） contents and ecological stoichiometry and their correlations of litter and soil along 1500-1900 m on Wugong Mountain meadow were studied. The results showed that litter C,N and P contents varied in the range of 397.5-458.24,11.59-17.12,1.05-2.19 mg·g^（-1）,respectively. Litter C content decreased,and the contents of N and P decreased first and then increased with the increases of altitude. Soil C,N and P contents varied in the range of 51.64-80.01,3.30-4.77,0.44-1.09 mg·g^（-1）,respectively. Soil C,N and P contents first increased and then decreased with the increases of altitude. However,soil P varied much less along the altitude gradient. Litter C： N,C： P and N： P varied in the range of 24. 73-40.36,203.65-463.08,7.16-13.80,respectively,and first increased but then decreased with altitude. Soil C： N,C： P and N： P were 14.95-16.95,56.87-162.52,3.69-10.58,respectively. Soil C： N changed little with altitude. Soil C： P and N： P first increased and then decreased with increasing altitude,with the maximum presented at 1600-1700 m. Changes in soil C,N and P contents differed between litter and soil on Wugong Mountain meadow. The mean C,N and P contents as well as C： N,C： P and N： P in litter were higher than those in soil.