在北路易斯安那州火炬松林分中取样测定了下层阔叶及常规采伐剩余物的生物量和养分元素含量。估计在这些林分中大约每公顷有五十二吨的下层阔叶、二十二吨松树采伐剩余物。与此相联,每公顷这些生物量中含有氮元素208公斤、磷元素16公斤、钾元素114公斤、钙元素215公斤、镁元素40公斤。把这些生物量作为薪柴取走,将大量减少中土壤过些元素的含量。 Samples of the Pinus taeda forest in North Louisiana were sampled to determine the biomass and nutrient content of the lower broadleaf and conventional harvest residues. Approximately 52 tonnes of broadleaved and about 22 tonnes of pine are estimated to harvest residues in these stands. Associated with this, each hectare contains 208 kg of nitrogen, 16 kg of phosphorus, 114 kg of potassium, 215 kg of calcium and 40 kg of magnesium. Taking these biomass as fuelwood will significantly reduce the amount of some elements in soils.