土壤有机碳全氮与杉木幼苗生长相关性研究

Research on the Correlation between Cunninghamia lanceolata Seedlings Growth and Soil Organic Carbon and Total Nitrogen Contents

为分析不同层次土壤对杉木幼苗生长的影响,以杉木第3代种子园实生轻型基质容器苗为研究对象,通过来自3个杉木林分不同层次土壤的盆栽试验,分别为A层(0~20 cm)、B层(20~40 cm)和C层(40~60 cm),1年后测定杉木生长量,分析土壤有机碳、全氮和C/N比与杉木幼苗生长相关性。结果表明:A层土壤(0~20 cm)有机碳、全氮含量和C/N比分别为19.4 g·kg^(-1)、1.2 g·kg^(-1)和15.5,幼苗生长表现最优,苗高和地径分别为85.9 cm和16.8 mm;其次是B层土壤(20~40 cm)有机碳、全氮含量和C/N比分别为16.7 g·kg^(-1)、1.1 g·kg^(-1)和15.3,苗高和地径分别为75.6 cm和14.5 mm;C层土壤(40~60 cm)有机碳、全氮含量和C/N比分别为3.8 g·kg^(-1)、0.5 g·kg^(-1)和7.8,幼苗生长表现较差,苗高和地径分别为75.0 cm和13.4 mm,通过相关性分析,杉木生长与有机碳C、全氮N和C/N比均呈正相关。

In order to analyze the effects of different layers of soil on the growth of Cunninghamia lanceolata seedlings,the container seedlings of the third generation seed orchard of C.lanceolata were taken as the research object,and different layers of soil from three C.lanceolata stands were used for pot experiment,namely,layer A(0-20 cm),layer B(20-40 cm)and layer C(40-60 cm).After one year,the growth of C.lanceolata was measured,and the correlation between soil organic carbon,total nitrogen and C/N ratio and the growth of C.lanceolata seedlings was analyzed,The results showed that:(1)The organic carbon content,total nitrogen content and C/N ratio of layer A soil(0-20 cm)were 19.4 g·kg^(-1)、1.2 g·kg^(-1)and 15.5 respectively.The seedling growth performance of was the best,and the seedling height and ground diameter were 85.9 cm and 16.8 mm respectively.(2)The organic carbon content,total nitrogen content and C/N ratio of layer B soil(20-40cm)were 16.7 g·kg^(-1),1.1 g·kg^(-1)and 15.3 respectively.The seedling height and ground diameter were 75.6 cm and 14.5 mm respectively.(3)The organic carbon content,total nitrogen content and C/N ratio in layer C soil(40-60cm)were 3.8 g·kg^(-1)、0.5 g·kg^(-1)and 7.8 respectively.The growth performance of seedlings was poor,and the seedling height and ground diameter were 75.0 cm and 13.4 mm respectively.Through correlation analysis,the growth of C.lanceolata was positively correlated with organic carbon content,total nitrogen content and C/N ratio.