Carbon,nitrogen and phosphorus stoichiometry in soil and dominant trees'stem at different stages of subtropical secondary forest succession
[Objective]This study measured the nutrients stoichiometric characteristics between plants and soil at different succession stages,and analyzed the correlation between plant-soil nutrients stoichiometric,thus providing a theoretical basis for revealing the survival strategies of plants in community succession.[Method]The spatio-temporal substitution method was used to determine the C,N and P contents of stem and soil of Pinus massoniana community,Populus pseudoacacia community,and Castanopsis hystrix community at different development stages(early,peak and late stage)in the Guanshan Nature Reserve of Jiangxi Province.[Result](1)The soil C,N and P contents of three forest increased from early to late stage,among which the soil C,N and P contents for P.massoniana forest increased by 5.5 times,6.1 times and 0.04 times,those of P.pseudoacacia forest increased by 0.45 times,0.38 times and 0.21 times,and those of C.hystrix the forest increased by 0.26 times,0.55 times and 0.34 times,respectively.(2)From the early to late stage of community,the stem C,C∶N and C∶P of P.massoniana were increased by 7.1%,164%and 200%,respectively,while its stem N and P contents were decreased by 58.9%and 70.0%,respectively.The stem C,N and P contents as well as their stoichiometric ratio of P.pseudoacacia fluctuated slightly.The stem C and N contents of C.hystrix changed little,and its stem P content was decreased by 25%.(3)The N,P and N∶P content of stem were significantly different among different species at the same development stage.The total N,P and N∶P of C.hystri were the highest in the early and peak stages,followed by P.Pseudopoplar and P.massoniana.At the same time,the soil C,N and P of C.hystri forest was significantly higher than those of P.Pseudopoplar forest and P.massoniana forest.(4)There was a significantly positive correlation between the stem C content of P.massoniana and soil C,N,C∶P,and N∶P,and a significantly negative correlation between the stem N,P and soil C,N,C∶P,and N∶P;while the correlation between the stem and soil C,N,and P stoichiometric characteristics for P.pseudoalder and C.hystrix forest was weak.[Conclusion]The requirements of N and P of tolerant P.massoniana species were lower than those of the competing species C.hystri.P.massoniana can adapt to the poor soil in the early succession stage,and significantly increase the nutrient content of soil C,N and P to create good soil conditions for late successional tree species with high N and P requirements.
secondary successiondifferent lifestylesecological stoichiometrynutrient use strategiesnatural restoration
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