红壤微生物量在土壤—黑麦草系统中的肥力意义

研究了红壤微生物量与土壤养分循环及植物生长的内在联系．结果表明，红壤微生物量不仅与土壤有机碳、全氮、有效氮等显著相关，而且与植物干物质产量及吸Ｎ 量也存在着良好的相关性，可作为指示红壤肥力水平和作物产量的重要指标．试验测得的红壤微生物量Ｎ 周转期较短，每年通过微生物周转的Ｎ 素达到微生物量氮含量的１ ．５ 倍到数倍．

Fertility significance of microbial biomass in red soil ryegrass system

The study on the inherent relations of microbial biomass in red soil with soil nutrient cycling and ryegrass growth shows that the microbial biomass was not only significantly correlated with soil organic C, total N and available N, but also highly correlated with dry matter yield and N uptake of plants,indicating that soil microbial biomass could be used as an important indicator for soil fertility and plant production. The turnover period of microbial biomass N in red soil was relatively short, and the annual flux of N through microbes was as 1.5 times or more as microbial biomass N.