Results showed that energy and materials input were mainly organic. There were surplus of nitrogen, phosphorus and potassium in the farmland soilpool.
结果表明：该农户生态系统能量和物质的投入均以有机为主，农田土壤库中氮、磷、钾均有盈余。
2
Recent findings have revealed the implications of black carbon in global biogeochemical cycles of carbon and oxygen through its contribution to the slow cycling of soil organic carbon pool.