氮磷湿沉降对2种林型红松林土壤活性有机碳及养分的影响

以不施用氮磷为对照,设低施用量氮磷(施用氮5 g·m-2·a-1、磷5 g·m-2·a-1)、中施用量氮磷(施用氮15 g·m-2·a-1、磷10 g·m-2·a-1)、高施用量氮磷(施用氮30 g·m-2·a-1、磷20 g·m-2·a-1)3种处理,在红松人工林和阔叶红松林2种林型的24个试验单元内,进行模拟氮磷湿沉降施肥试验,分析氮磷湿沉降对土壤活性有机碳及养分的影响。结果表明:氮磷湿沉降处理对土壤易氧化有机碳、土壤有机碳影响显著,对土壤全氮、全磷、轻组碳、颗粒有机碳影响不显著。土壤易氧化有机碳与土壤颗粒有机碳、轻组碳之间呈负相关关系,土壤易氧化有机碳、土壤轻组碳与土壤有机碳、全氮、全磷呈正相关关系;土壤颗粒有机碳与全氮、全磷呈显著负相关关系,土壤颗粒有机碳与土壤有机碳呈极显著负相关关系。

Effects of Wet Deposition of N and P on Soil Active Organic Carbon and Nutrients in Two Types of Korean Pine Forests

Taking no application of N and P as the control,three treatments of low application rate of N and P(N:5 g·m-2·a-1;P:5 g·m-2·a-1),medium application rate of N and P(N:15 g·m-2·a-1;P:10 g·m-2·a-1),high application rate of N and P(N:30 g·m-2·a-1;P:20 g·m-2·a-1)were used to simulate wet deposition of N and P in 24 experimental units of Korean pine plantation and broad-leaved Korean pine forest,and the effects of wet deposition of N and P on soil active organic carbon and nutrients were analyzed.The wet deposition of N and P had significant effect on soil easily oxidized organic carbon and soil organic carbon,but had no significant effect on soil total N,total P,light fraction carbon and particulate organic carbon.There was a negative correlation between soil easily oxidized organic carbon and soil particulate organic carbon,light fraction carbon.There was a positive correlation between soil easily oxidized organic carbon,light fraction carbon and soil organic carbon,total N and total P;there was a significantly negative correlation between soil particulate organic carbon and total N and total P,and a significantly negative correlation between soil particulate organic carbon and soil organic carbon.