The urban environment afforests the ecology principle .
城市环境绿化中的生态学原则。
In the garden planted the massive gingkos , the pointed zelkova , ma guamu and so on many big specification tree , the plant to be scattered and organized , afforests each level clearly demarcated .
园内种植了大量银杏、榉树、马褂木等许多大规格乔木、植物错落有致，绿化层次分明。
Each year , china creates 5.3 million hectares of forests , afforests another 3.7 million hectares of mountains where hunting and grazing are prohibited , and plants 2.4 billion trees by advancing the compulsory tree-planting campaign .
