福建典型冷浸田土壤活性有机C、N 组分特征

基于福建典型冷浸田与邻近景观单元内的非冷浸田7对14个土壤样品数据，利用配对 t检验等统计方法研究冷浸田土壤活性有机C、N组分特征。结果表明，冷浸田土壤有机C含量与C/N较非冷浸田分别提高22.1％与0.56个单位，差异显著，但冷浸田土壤微生物生物量C与水溶性C组分含量及二者占有机C比重均显著低于非冷浸田，同样，冷浸田土壤微生物生物量N含量及其占全N比重也显著低于非冷浸田。冷浸田土壤有机质含量丰富，但组分品质差。冷浸田土壤微生物生物量C或水溶性C或可作为冷浸田改良效果评价的参考指标之一。

Active Organic Carbon and Nitrogen in Soils from Typical Cold-waterlogged Paddy Fields in Fujian

Paired between the cold-waterlogged and the nearby non-cold-waterlogged paddy fields in Fujian , the active organic carbon and nitrogen contents of 14 soil samples were statistically compared using the t test .The results showed that the organic carbon content and C/N value for the cold-waterlogged soil were 22.1% and 0.56 , respectively ,significantly more than its counterpart .But the contents of the microbial biomass carbon （MBC） and dissolved organic carbon （DOC） ,as well as their proportion to the total organic carbon ,were significant lower than those of the soils from the non-cold-waterlogged paddy fields .Similarly ,the MBN and its proportion to the total organic nitrogen in the cold-waterlogged paddy soils were lower than those of the non-cold-waterlogged samples . The organic matters in the cold-waterlogged paddy soils were high ,but quality poor insofar as the composition is concerned .It appeared that MBC and/or DOC could be used as an indicator in evaluating soil from the cold-waterlogged paddy fields .