平原农业区,沃野千里,土地膏腴,素有寸土寸金,粮食囤子之称。区内特点是:森林覆盖率小,民需用材和薪炭材不能自给;牧场和采草地面积也不多,家畜中饲养的食草动物比率也不大;群众烧柴仰赖于作物秸杆,使其不能还田,导致农耕地腐植质含量日益降低。因而常为四料(木料、燃 Plain agricultural areas, fertile fields thousands of miles, land plaster, known as inch of land, gold, food store called. The characteristics of the area are: small forest coverage, private demand materials and firewood materials can not be self-sufficient; pasture and mining grassland area is not much, animal husbandry of herbivores in the ratio is not large; the masses depend on straw wood to make it Can not return to the field, resulting in decreasing levels of humus in agricultural land. So often four expected (wood, burning