Distribution of organic material Hardwood forest Tallgrass prairie kg/ha Aboveground(地上部) 136000 8000 Belowground(地下部) Roots 57000 136000 Soil organisms 6300 Litter layer(枯枝落叶层)48000 Soil organic matter 173000 400000 Belowground Total 278000 542300 Stevenson and cole 1999Distribution of organic material Stevenson and Cole 1999 Aboveground(地上部) Belowground(地下部) Roots Soil organisms Litter layer(枯枝落叶层) Soil organic matter Belowground Total Hardwood forest 136 000 57 000 48 000 173 000 278 000 Tallgrass prairie 8000 136 000 6300 400 000 542 300 kg/ha