摘要：

In this research, straw biochar was added to the coastal mudflat soil in amounts of 5%, 10%, 15% or 20%(m /m, wet weight)to improve soil fertility. The rice grain yield and the grain-straw ratio were recorded for two years. And the soil properties were also investigated to evaluate the effects of biochar on rice plant growing and soil properties. The results showed that the rice grain yield and the grain-straw ratio were increased with the appropriate biochar amount amended. Straw biochar also increased soil electrical conductivity (EC) and cation exchange capacity(CEC). The contents of soil total carbon and soil nitrogen were improved with biochar amended comparing with that of control although their values decreased due to mineralization during soil fallow. No significant effects of biochar were obtained on soil pH. It is an environmental friendly approach to improve coastal mudflat soil fertility using straw biochar as it has the ability of carbon immobilization and improvement of soil fertility.

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