马尾松优质高产纸浆林培育技术及经营效益

Study on Cultivation of a High-Yielding Masson Pine Pulp Stand and Analysis on Its Economic Benefits

1997—1998年在福建南平地区采用优良种源营建马尾松纸浆林136 7hm2,造林后第5年对林木的生长量、生物量、木材材性与化学组分以及浆纸性能进行全面测试。结果表明:5年生纸浆林平均蓄积14 88m3·hm-2,比对照高117 86%,比部颁标准高396%。林木生物量比对照高31 1%,其中树干生物量高达70 4%。纸浆林与对照相比较,α 纤维素含量高、木素含量较低,纤维形态细而长,长宽比值大;木材基本密度较大,细浆得率稍高;浆纸物理强度:裂断长,耐破与撕裂两项综合强度指数均大于对照。按纸浆林每公顷总投入为13694元,总收入为93324元,产出投入比为6 8,净收入79630元,12%为基准计算的净现值为8732元,内部收益率18 2%。纸浆林经营技术适用,预期经营效益较好。

A pulp stand of Masson pine (Pinus massoniana) with a area of 136.7 hectares was established in Nanping of Fujian Province in 1997-1998. Five years after planting, the increment, biomass, wood property, wood chemical components and its pulping property were tested. The results showed that the average volume of the stand was 14.88 m3·hm-2, which was 117.86% higher than that of the CK or 396% higher than the standard issued by State Forestry Administration. The biomass was 31.1% higher than the CK, and the biomass of stem was as high as 70.4%. Compared with the CK, the pulp stand was characterized by higher αcellulose content, lower lignin content, slenderer fiber and higher ratio of length to width. The wood obtained had heavier wood basic volume weight and higher tensile, burst and tear strength of paper. The average input perhectare of pulp stand was 13 694 RMB yuan. The NPV was 8 732 RMB yuan based on the I of 12% and the IRR was 18.2%.