天然马尾松林细根生物量分布及其与土壤理化性质相关性研究

摘要

基于江西中部天然马尾松林不同生长阶段细根生物量及土壤性质的调查，分0～20 cm、20～40 cm土层探讨细根生物量的分布规律及其与土壤理化性质的相关关系。结果表明，不同龄组土壤细根总生物量大小表现为：过熟林＞幼龄林＞成熟林＞中龄林＞近熟林，同一土层不同龄组生物量之间无显著差异（ P＞0.05），各龄组细根生物量主要集中在0～20 cm土层中。各土层不同龄组间土壤含水率均表现为成熟林显著大于幼龄林（ P＜0.05），容重与土壤碳氮磷含量差异均不显著（P＞0.05），且碳氮磷大部分都储存在0～20 cm土层中。0～20 cm土层中，活细根生物量与土壤含水率、容重、有机碳、全氮含量相关性均达显著水平（ P＜0.05），而死细根生物量与土壤理化性质之间的相关性均不显著（P＞0.05），细根总生物量与土壤含水率、容重相关性显著（P＜0.05），与全氮含量相关性达极显著水平（P＜0.01）；20～40 cm土层中，活细根生物量与土壤理化性质之间相关性均不显著（P＞0.05），但全氮含量与细根总生物量相关性显著（P＜0.05），与死细根生物量相关性达极显著水平（P＜0.01）；活细根总生物量、死细根总生物量及细根总生物量与全磷含量相关性在两土层中均不显著（P＞0.05）。%Based on a survey of fine root biomass and soil properties between different growth stages of Pinus mas-soniana natural forest in central of Jiangxi province, the soil was divided into 0~20 cm and 20~40 cm layers to investigate the distribution of fine root biomass and its correlation with the physical and chemical properties of soil. The results showed that the total fine root biomass of different age groups in soil were as follows:over-mature forest>young forest >mature forest >middle-age forest >near-mature forest.However, the biomass in different age groups in the same soil layer showed no significant difference ( p>0.05 ) .The biomass of each age group was mainly concentrated in 0~20 cm layer.Between the different age groups of each layer, soil moisture showed sig-nificant difference (p<0.05), while bulk density, organic carbon content, and total nitrogen and total phosphor-us showed no significant difference ( p>0.05) .Most carbon, nitrogen and phosphorus were stored in the 0~20 cm layer.In the 0~20 cm layer, live fine root biomass was significantly correlated with moisture, bulk density,content of organic carbon and total nitrogen ( p<0.05 ) while the dead fine root biomass showed no significant cor-relation with the physical and chemical properties of soil ( p>0.05) .The total fine root biomass was significantly correlated with moisture and bulk density ( p<0.05) as well as with total nitrogen content ( p<0.01) .In the 20~40 cm layer, live fine root biomass showed no significant correlation with the physical and chemical properties of soil ( p>0.05 ) , but total nitrogen content significantly correlated with total fine root ( p<0.05 ) biomass and dead fine root biomass (p<0.01).Live, dead and total fine root biomass both showed no significant correlation with total phosphorus content in the two soil layers ( p>0.05) .