不同类型茶园土壤有机碳、氮剖面分布特征
Vertical Profile of Organic Carbon and Nitrogen Distribution in Different Tea Garden Soil
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摘要: 以武夷山5种主要的茶园土壤类型 (黄壤、红壤、潮砂土、高山草甸土、紫色土) 为研究对象, 对其土壤碳、氮特征进行研究。结果表明:不同土壤类型和同一土壤类型不同土层土壤有机碳、氮含量及储量均存在很大差异。5种土壤类型茶园020cm土层有机碳、氮含量和碳、氮储量均显著高于2040、4060和6080cm土层, 并随土层深度增加而逐渐下降, 说明茶园土壤有机碳、氮储量表聚作用明显。5种土壤类型茶园同一土层有机碳、氮含量大小为:高山草甸土>黄壤>紫色土>潮砂土>红壤;080cm土层有机碳储量大小为高山草甸土 (253.29t·hm-2) >紫色土 (134.17t·hm-2) >黄壤 (132.44t·hm-2) >潮砂土 (102.95t·hm-2) >红壤 (46.28t·hm-2) ;土壤氮储量与有机碳储量变化规律相似。相关分析表明, 茶园土壤有机碳与全氮、C/N、孔隙度比之间呈显著或极显著正相关, 而与土壤容重极显著负相关;土壤有机碳、氮与土壤水分、pH之间无明显相关性。Abstract: Five soil types (yellow soil, red earth, moisture sandy soil, alpine meadow soil and purple soil) from tea garden in Wuyishan City were investigated for the content of soil organic carbon (SOC) and nitrogen (N) , storage and distribution.The results showed that SOC and N content and storage differed significantly among five soil types and along soil vertical depths.The SOC and N contents were significantly higher in 0-20 cm soil layer than in 20-40, 40-60 and 60-80 cm soil layers for all five soil types, but the concentration decreased along with the soil vertical depths.The concentration profile of SOC and N indicated the up layer accumulation effect of SOC and N in the soils.Comparing in the same soil layer, the contents of SOC and total N were following in order as alpine meadow soil>yellow soil>purple soil>moisture sandy soil>red earth.The SOC storage in the same soil layer of 0-80 cm was in order as alpine meadow soil (253.29t·hm-2) >purple soil (134.17t·hm-2) >yellow soil (132.44t·hm-2) >moisture sandy soil (102.95t·hm-2) >red earth (46.28t·hm-2) .The soil TN storage demonstrated in the same trend as the SOC storage.The observation in this study showed significant positive correlation of soil organic carbon with total nitrogen, C/N and porosity, but SOC and N concentration on the other hand showed a significant negative correlation with soil bulk density.The SOC and N concentration had no significant correlation with soil moisture and pH value.