桂林毛村岩溶区与非岩溶区果园土壤养分性质比较研究

Study on orchard soil nutrients comparison between Karst and non-Karst area in Maocun,Guilin,China

研究了处于同一气候条件下岩溶区与非岩溶区果园土壤溶解有机碳的空间变化及其与土壤养分性质的关系。结果表明:岩溶区土壤pH值与土壤溶解有机碳(DOC)呈极显著负相关关系(r=-0.465,P<0.01),DOC与土壤有机碳、全氮、速效氮呈极显著正相关关系(r分别为0.347、0.574、0.444,P<0.01);非岩溶区DOC与土壤有机碳、土壤全氮含量呈正相关关系(r分别为0.187、0.191)。土壤溶解有机碳、土壤溶解有机氮(DON)与土壤微生物量碳(MBC)、土壤微生物量氮(MBN)的关系依土壤环境条件差异而不同。非岩溶区土壤的C/N较适宜土壤微生物的生长、繁殖。岩溶区与非岩溶区时空变化,导致土壤养分性质变化。

The spacial variation of soil dissolved organic carbon（DOC）in Karst and non-Karst areas at the same climatic condition and its relationship with soil nutrients were studied in Maocun,Guilin,China.The results indicated a very significantly negative correlation between the concentrations of DOC and soil pH values（r=-0.465,P〈0.01）.Soil organic carbon,total nitrogen and available nitrogen had significantly positive correlation with DOC（r=0.347,0.574,0.444,P〈0.01）in Karst area.And positive correlation was found between soil organic carbon and total nitrogen and DOC in non-Karst area（r=0.187,0.191,P〈0.05）.DOC,soil microbial biomass carbon（MBC）,soil dissolved organic nitrogen（DON）and soil microbial biomass nitrogen（MBN）were different according to soil environment.The ratio of C/N in soil in Karst area was suitable for soil microorganisms.The soil nutrients varied significantly resulting from the time and area difference.