马尾松与阔叶树异龄混交林叶片和土壤生态化学计量特征研究OA

In order to elucidate synergistic effects of uneven-aged mixing of Pinus massoniana with broad-leaved tree species on leaf-soil ecological stoichiometric characteristics,taking P.massoniana×Castanopsis hys-trix,P.massoniana×Michelia macclurei,P.massoniana×Xanthostemon chrysanthus,P.massoniana×Erythroph-leum fordii and P.massoniana×Mytilaria laosensis mixed plantations in south subtropical region as research ob-jects,contents of P.massoniana leaf carbon(C),nitrogen(N)and phosphorus(P)and ecological stoichiometric ratios as well as soil nutrient contents and ecological stoichiometric ratios were measured.Results showed that P.massoniana leaf P contents in P.massoniana×M.macclurei,P.massoniana×X.chrysanthus,P.massoniana×E.fordii and P.massoniana×M.laosensis mixed plantations were significantly higher than that in P.massoniana pure plantation,while N∶P were significantly lower than that in P.massoniana pure plantation.In 0-20 and 20-40 cm soil layers,P.massoniana×C.hystrix mixed plantation had the highest contents of soil organic car-bon(SOC),total potassium(TK)and available phosphorus(AP)as well as C∶N;P.massoniana×M.macclurei mixed plantation had the highest contents of soil total nitrogen(TN)and total phosphorus(TP);P.massoniana×X.chrysanthus mixed plantation had the highest soil available potassium(AK)content;P.massoniana×E.fordii mixed plantation had the highest soil C∶P.In 0-20 cm soil layer,soil N∶P was the highest in P.massoniana×E.fordii mixed plantation,whereas in 20-40 cm soil layer,it was the highest in P.massoniana pure plantation.In different stands,contents of soil SOC,TK,AP and AK as well as C∶N,N∶P and C∶P in 0-20 cm soil layer were higher,while soil TP contents in 20-40 cm soil layer were higher.Leaf nutrient contents and ecological stoi-chiometric characteristics of P.massoniana showed stronger correlations with soil nutrient contents and ecologi-cal stoichiometric characteristics in 0-20 cm soil layer than in 20-40 cm soil layer.P.massoniana×X.chrysan-thus and P.massoniana×M.laosensis mixing were suitable for application in stands severely limited by P.P.massoniana×C.hystrix mixing was conducive to overall soil fertility improvement and was suitable for applica-tion in nutrient-poor stands;P.massoniana×E.fordii mixing was suitable for application in stands with insuffi-cient N supply.