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《Journal of Soil and Water Conservation》 2017-04
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Contents of Soil Organic Carbon and Its Relations with Physicochemical Properties of Secondary Natural Oak Forests in Eastern Mountain Area of Liaoning Province

QI Jinhu;Forest Management Research Institute of Liaoning Province,Liaotung Peninsula Forest Ecosystem Long-term Research Station;  
Based on the sampling(0-10,10-20,20-30 and 30-40cm)and lab analysis of two representative natural secondary oak forest plots in Liaodong mountain area,which was located in the town of Benxi City River Estuary and the fairy town of Zhuanghe City,the distribution characteristics of soil organic carbon,total nitrogen,and total phosphorus at the depth of 0-40 cm was studied,and the relationship between organic carbon and other physical and chemical properties was discussed.Results showed that soil organic carbon,total nitrogen,total phosphorus,total potassium,available nitrogen,available phosphorus,available potassium and cation exchange capacity tended to decline with the increasing soil depth,however soil bulk density generally increased with increasing soil depth.According to the t test and variance analysis,there was a significant difference between the experiment indicators and the soil layer(P0.05).Moreover,the content of silt showed a very high positive correlation with the soil organic carbon,pH value,total nitrogen,total phosphorus,total potassium,alkaline hydrolysis nitrogen,available phosphorus,available potassium and cation exchange capacity(r=0.430 9~0.919 0,n=44,P0.01).While soil bulk density and the content of sand had a significant negative correlation with soil organic carbon(r=0.388 3~0.670 6,n=44,P0.01).But the content of clay had no significant correlation with soil organic carbon.Stepwise regression analysis showed that the relationship between soil available nitrogen,the ratios of carbon to nitrogen,total potassium,pH,total nitrogen and organic carbon was the closest.Overall,there was closerelationships between soil organic carbon and other physical and chemical properties,and the total nitrogen,available nitrogen,the ratios of carbon to nitrogen,total potassium and pH had big impact on it.At the same time,each index had obvious profiles distribution.
【Fund】: 林业公益性行业科研专项(201404303);; 辽宁辽东半岛森林生态系统国家定位观测研究站运行补助项目(2017-LYPT-DW-024)
【CateGory Index】: S714.2
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