Carbon sequestration , nutrient cycle and falling leaves

One can see its autumn season now and leaves are falling in tropical climate.  The  fallen leaves contain almost 40 percent carbon which has been absorbed from the atmosphere. Thus plants help remove the carbon from the atmosphere. However growing plants deplete soil of its nutrients. If the fallen leaves are buried in the soil 2 to 3 feet deep for next 3 to 6 months one can get best quality compost which will provide nutrients back to the soil on one hand and help in carbon sequestration . Simple techniques could help environment  in environment protection.