近年来 ,我省杨树种植面积发展很快 ,形成效益较高的“杨树产业”。但杨树干材出售以后 ,大量的树皮、树枝等副产品没有得到很好利用 ,一般都作为柴烧或堆在外面任凭风吹日晒、雨淋。其实 ,这些副产品是很好的金针菇栽培的好原料。杨树不仅含有丰富的碳水化合物 ,而且氮素含量? In recent years, the planting area of ​​poplar in our province has developed rapidly, forming a “poplar industry” with high benefit. However, after sales of dried poplar, a large number of by-products such as bark and twigs have not been well utilized, and are generally used as firewood or piled on the outside for wind, sun and rain. In fact, these by-products are good raw materials for the cultivation of Flammulina velutipes. Poplar is not only rich in carbohydrates, but also nitrogen content?