Vertical Distribution Characteristics of Soil Organic Carbon and Nutrients in Camellia semiserrata Plantation and Secondary Forest
In this paper,the Camellia semiserrata plantation and secondary forest in Zhangmutou Forest Farm of Guangdong province were selected as the research objects,to determine the soil carbon(C),nitrogen(N),and phosphorus(P)of the two stands,and analyze the vertical changes of soil total organic carbon(TOC)and its influencing factors,which can provide scientific data for forest soil TOC accumulation and nutri-ent management.The results showed that:(1)Soil bulk density increased with the increase of soil depth,while total porosity,non-capillary porosity,and aerated porosity decreased with the increase of soil depth.The soil water content,capillary water capacity,and capillary porosity of C.semiserrata plantation were significantly higher than those of the secondary forest,while the non-capillary porosity and aerated porosity were significant-ly lower than those of the secondary forest.(2)The TOC,total N(TN),hydrolyzed N(HN),available P(AP),C ∶ N,C ∶ P,and N ∶ P of the two stands decreased with the increase of soil layer,but the soil pH value and total P(TP)were not significantly different among different soil layers.The contents of TOC,TN,TP,total potassium(TK),available potassium(AK),and HN in secondary forests were significantly higher than those in C.semiserrata plantation.(3)Correlation analysis showed that TOC was negatively correlated with bulk density and TK,and positively correlated with total porosity and aerated porosity.TOC content in sec-ondary forest was negatively correlated with bulk density,capillary porosity,and TK,and positively correlated with HN,capillary porosity,aerated porosity,and TN.TOC content in the topsoil of the secondary forest was positively correlated with HN and AP.In addition,TOC in both topsoil and subsoil soil of the two stands showed a significant positive correlation with C ∶ N and C ∶ P,indicating that TOC in topsoil was more suscepti-ble to the influence of soil physical properties,while TOC in subsoil was regulated by C ∶ N and C ∶ P.The re-sults showed that TOC and N,P,and K elements in C.semiserrata plantation were lower than those in the sec-ondary forest,indicating that the growth and yield of C.semiserrata were affected by the supply of soil N,P,and K nutrients,and the nutrient management of C.semiserrata plantation should be strengthened in the future.The TOC of topsoil was significantly affected by the soil physical properties,indicating that tending and manage-ment would change the contents of soil organic carbon.
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