【作者】 秦海龙； 贾重建； 卢瑛； 郭彦彪； 姜坤； 李先霞； 杨奇青； 温志滔；

【Author】 Qin Hailong;Jia Chongjian;Lu Ying;Guo Yanbiao;Jiang Kun;Li Xianxia;Yang Qiqing;Wen Zhitao;College of Natural Resources and Environment,Aouth China Agricultural University;Management Department of Luofu Mountain Provincial Nature Reserve,Guangdong Province;Luofu Mountain Forest Farm of Huizhou City,Guangdong Province;

【机构】 华南农业大学资源环境学院； 广东罗浮山省级自然保护区管理处； 广东省惠州市罗浮山林场；

【摘要】 为探究我国南亚热带山地土壤有机碳（SOC）随海拔变化规律,选取了广东省罗浮山作为研究对象,从山脚到山顶（海拔280～1210 m）共布设了10个样点,分别采集0～20 cm、20～40 cm、40～60 cm、60～80cm、80～100 cm土壤样品。分析了土壤有机碳含量及其储量、有机碳组分及其与海拔、土壤理化性质的关系。结果表明:1)土壤有机碳含量及其储量均随海拔高度上升逐渐增加,0～20 cm土壤有机碳储量与海拔高度呈显著的正相关;土壤有机碳储量随土层深度增加而降低,0～20 cm土壤有机碳储量为14.81～124.01 t/hm² （均值44.77 t/hm²）,80～100 cm为1.76～26.11 t/hm²（均值为10.74 t/hm²）;土壤有机碳主要集中分布在0～40 cm土壤中;2)高锰酸钾氧化的有机碳（POXC）的含量随土壤深度增加而降低,0～20 cm,至80～100 cm土壤中POXC含量分别在海拔1 210 m和280 m处变幅分别为最大（18.33～0.24 g/kg,降幅为:18.09 g/kg）和最小（2.52～0.27 g/kg,降幅为2.25 g/kg;相同深度土层中,POXC含量随海拔上升而增加;3）土壤有机碳组分C_F1、C_F2、C_F3和C_F4含量均在0～20 cm土壤中最高,在80～100 cm土壤中最低,呈现出随土层深度的增加而降低的趋势。在相同深度土壤中,C_F1、C_F2、C_F3和C_F4含量随海拔高度增加呈增加的趋势,且随土层深度的增加,差异越来越小。高活性态有机碳(C_F1)所占比例平均值随土壤深度增加而降低,非活性态有机碳(C_F4)所占比例平均值随土壤深度增加而增加,土壤有机碳稳定性增加;4) POXC、C_F1、C_F2、C_F3、C_F4与土壤有机碳含量、土壤容重、全N、全P、CEC、粉粒含量呈极显著或显著的相关性。更多还原

【Abstract】 In order to understand the influence of altitude on soil organic carbon（SOC） in south subtropical mountain,ten soil profiles were selected from foot to top（altitude between 280 to 1210 m） in Luofu mountain,Guangdong province,and soil samples at 0～20 cm,20～40 cm,40～60 cm,60～80 cm,80～100 cm depths were collected.SOC contents,stocks and fractions and their relationship with altitude and soil physico-chemical properties were studied in this paper.The results indicated that:①SOC content and stock increased with the increase of altitude,there existed significantly positive correlation between SOC stock in 0～20 cm and altitude;SOC stock decreased with soil depth increasing,The range of SOC stock in 0～20 cm depth was 14.81～124.01 t/hm² with an average of 44.77 t/hm²,and 1.76～26.11 t/hm²（with an average of 10.74 t/hm² in 80～100 cm depth;SOC mainly accumulated in 0～40 cm depth.2）Permanganate oxidizable carbon（POXC） content decreased with the increase of soil depths,the variation of POXC content from 0～20 cm to 80～100 cm was the largest（18.33～0.24 g/kg with 18.09 g/kg difference） at 1210 m altitude,and the smallest（2.52～0.27 g/kg with 2.25 g/kg¹ difference） at 280 m altitude;POXC content in the uniform soil depth increased with altitude increasing.3) SOC fraction contents of C_F1、C_F2、C_F3 and C_F4 were the highest in 0～20 cm depth and the lowest in 80～100 depth with the tendency of decrease with the increase of soil depths.The contents of C_F1、C_F2、C_F3 and C_F4 in the uniform soil depth increased with altitude increasing,and the difference became smaller with soil depth increase.The proportion of easily liable fraction(C_F1) decreased with the increase of soil depths,and non-liable fraction(C_F4)increased with increase of soil depths,suggesting SOC stability increased with soil depth increase.4) There existed significantly positive correlation between POXC,C_F1,C_F2,C_F3,C_F4 and SOC,soil bulk density,total N,total P,CEC,silt content.更多还原