Pinus ellittii Engelm.and Pinus taeda L.have greater ability of forming mature timber by scattering seed naturally.But with artificial measure to promotion to the forestry natural regeneration,the growing speed of young plant growth's subterranean stem and height can come up to the reforestation standards, and can economize on afforestation cost about 34.95 yuan per mu.The economic effectiveness is very remarkable,so the technology is worth devoting major efforts to develope it.
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