海南省枫木实验林场橡胶林根系分布特征  

Root Distribution Characteristics of Hevea brasiliensis Forest in Fengmu Experi-mental Forest Farm of Hainan Province

作　　者：杨文凤 田乐宇 韦建杏 YANG Wen-feng(Hainan Academy of Forestry(Hainan Academy of Mangrove),Haikou,Hainan571100)

机构地区：[1]海南省林业科学研究院(海南省红树林研究院),海南海口571100 [2]海南省枫木实验林场,海南屯昌571600

出　　处：《园艺与种苗》2023年第6期61-63,共3页Horticulture & Seed

摘　　要：[目的]科学地根据橡胶(Hevea brasiliensis)林根系分布特征进行水肥管理。[方法]以海南省枫木实验林场的橡胶人工林为研究对象,采用样方挖掘法,调查不同土层深度的橡胶林土壤根系生物量密度,通过方差分析和拟合方程分析等方法,探究橡胶林的根系分布特征。[结果]在橡胶林0~100 cm深的土层内,直径0~10 mm根系的生物量密度为578.28 g/m^(3),且细根是橡胶根系的主要组成部分(占比49.06%)。根系主要分布在0~30 cm深的土层中(占比75.55%),且随土层加深,各径级根系的生物量密度均显著降低。橡胶林根系生物量密度最适回归方程为:ln(y)=7.73-0.04×d。[结论]0~30 cm深的土壤表层应是橡胶林水肥管理的重点区域。[Objective]Water and fertilizer management were carried out according to the characteristics of Hevea brasiliensis forest root distribution.[Method]Taking the H.brasiliensis forest in Fengmu Experimental Forest Farm of Hainan Province as the research object,the root biomass density of H.brasiliensis forest at different soil depths was investigated by quadrat excavation method.The root distribution characteristics of H.brasiliensis forest were explored by variance analysis and fitting equation analysis.[Result]In the 0~100 cm deep soil layer of H.brasiliensis forest,the biomass density of roots with a diameter of 0~10 mm was 578.28 g/m^(3),and fine roots were the main components of H.brasiliensis roots(accounting for 49.06%).Roots were mainly distributed in 0~30 cm deep soil layer(accounting for 75.55%).With the deepening of soil layer,the biomass density of roots of each diameter class decreased significantly.The optimum regression equation of root biomass density was:ln(y)=7.73-0.04×d.[Conclusion]The 0~30 cm deep soil surface layer should be the key area for water and fertilizer management of H.brasiliensis forest.

关 键 词：橡胶林 根系分布 生物量 

分 类 号：S718.5[农业科学—林学]