不同海拔云南松林土壤养分及其生态化学计量特征

以云南东北部不同海拔云南松天然次生林为研究对象,比较不同海拔土壤有机碳(C)、全氮(N)、全磷(P)、全钾(K)、碱解氮(AN)、有效磷(AP)、速效钾(AK)及其化学计量特征.结果 表明:海拔间土壤C、N、P、K、AN、AP、AK的值分别为7.85～31.61 g·kg-1、1.08～2.11 g·kg-1、0.19...

Soil nutrients and their ecological stoichiometry of Pinus yunnanensis forest along an elevation gradient

I compared the differences in the contents and stoichiometry of soil organic carbon(C),total nitrogen(N),total phosphorus(P),total potassium(K),available nitrogen(AN),available phosphorus(AP),and available potassium(AK)in Pinus yunnanensis secondary forest along an elevation gradient in northeast Yunnan.Results showed that(1)the concentrations of C,N,P,K,AN,AP,AK among elevations ranged 7.85-31.61 g·kg^-1,1.08-2.11 g·kg^-1,0.19-1.41 g·kg^-1,3.65-15.10 g·kg^-1,51.33-144.35 mg·kg^-1,0.56-2.42mg·kg^-1,0.03-0.35 g·kg^-1,respectively;(2)with increases in elevation,soil C,N,P,P∶K,C∶N showed a trend of first increasing and then decreasing,whereas C∶P and N∶P showed an opposite trend;(3)Soil C content was positively correlated with N,AN,AP,AK,C∶N,C∶P,C∶K,N∶K or P∶K,but negatively correlated with K.These results suggest that the main soil nutrients and their stoichiometric characteristics of P.yunnanensis forest in this area varied obviously with altitude,with poor nitrogen and phosphorus status.Nutrient rich soil was found in the middle elevation,which is consistent with the growth performance of P.yunnanensis.Results from this study provide insights for understanding the growth and distribution of P.yunnanensis.