Distribution Characteristics and Coupling Relationship of Organic Carbon and Total Nitrogen in Phyllostachys pubescens Forests with Different Operations and Management Modes

The distribution characteristics and coupling relationship of organic carbon and total nitrogen were researched in Phyllostachys pubescens forests with different operations and management modes in Yongan county,Fujian province.The results showed that a significant difference existed in the ratio of organic carbon and nitrogen of different organs of Phyllostachys pubescens.The ratio of organic carbon and nitrogen was in the order of bamboo culmbamboo rootculm stumpbamboo branchbamboo rhizomebamboo rhizome rootbamboo leaf,and was 293.64,223.11,163.83,158.53,128.97,93.04,and 41.73,respectively.The distribution amount of organic carbon,total nitrogen,and the ratio of carbon and nitrogen were affected significantly by the management measures.The distribution amount of organic carbon and total nitrogen were both in the order of ⅡⅢⅠ,and the carbon were 31 130.42,23 152.67,14 466.17 kg/(hm2·a) ,respectively;and the nitrogen were 264.19,210.53,104.06 kg/(hm2·a) ,respectively.There was a significant difference among the organic carbon and the total nitrogen amount in bamboo forests with different management model.The ration of carbon and nitrogen was in the order of ⅠⅢⅡ,and was 139.67,129.10,117.83,respectively.There was significant difference between the forest Ⅰand forest Ⅱ,Ⅲ.The content of carbon and nitrogen of soil decreased with management intensity,and the ratio of carbon and nitrogen increased with management intensity.The ratio of carbon and nitrogen in soil was arranged from 24 to 28.The soil fertility of bamboo forest soil was better than other forest types.There existed a better coupling relationship between organic carbon and total nitrogen in forest ecosystem.It can be simulated well by linear model.