The cassava is a perennial plant that grows best under tropical , moist , fertile , well-drained soils .
木薯为多年生植物,尤其在热带地区潮湿、肥沃、排水良好的土地里生长良好。
Darker soils are often rich in iron and aluminum oxides , and are typical of highly weathered soil that forms in hot , humid climates .
而深色的土地通常是富含铁和氧化铝,是在湿热气候下形成的典型的高度风化的土壤。
There are uncertainties , though - for example , the planet 's oceans , forests and soils could release their massive stocks of carbon as the world warms , leading to much greater temperature rises than human emissions alone would cause .
Retallack , a palaeopedologist , analysed sediments associated with ediacaran fossils from the flinders ranges and says he has found evidence of fossil soils .