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用灰色多层次综合评判方法对６种杨树１０个树龄造纸用材的理化性能及未漂浆质量进行综合评判，选出了造纸质量高、经济效益好的优质树种和最佳林龄，其结果是Ⅰ－４５杨以７年生为最好；９年生健杨居于第２；９年生Ⅰ－４５杨树居于第３；５年生Ⅰ－４５杨树居于第４；１０年生小钻杨排第５。这弥补了林业上定性决策的不足，为进一步发展造纸用材的提供讯息和科学依据。该方法在林业系统的其它方面有广泛的实用价值。
The comprehensive evaluation of physical and chemical properties and unbleached pulp quality of the ten age-old paper-making timber of six poplar species by gray multi-level comprehensive evaluation method was carried out, and the best tree species with the best paper quality and good economic benefit were selected. The I-45 poplar was the best at the 7th year. The 9-year Yang was at the 2nd, the I-45 poplar was at the 3rd, the I-45 poplar was at the 4th, and the 10-year Poplar was the 5th . This makes up for the lack of qualitative decision-making in forestry, to provide further information and scientific basis for the development of paper-making timber. This method has extensive practical value in other aspects of the forestry system.