川滇桤木的生境适应性、木材纸浆性能与林分生态效益分析

Environmental Adaptability,Timber Pulp Quality and Stand Ecological Benefits of Alnus cremastogyne cv.yanshan

川滇桤木是一个生态经济型的纸浆原料林树种,适于在亚热带地区重点发展,或与桉树混交及作桉树林退化后的替代种植树种,以实现纸浆原料林的可持续发展。川滇桤木的生境适应性强、生长速度快,除干旱的阳坡不宜种植外,对各种立地环境都较适应,其人工林林木高和径的年均生长量都在1以上。川滇桤木木材的造纸性能良好,其木材密度为0.48 g/cm3,纤维长度1.19 mm,纤维长宽比91.47,综纤维素87.17%,苯醇抽出物2.56%,细浆得率43.6%,黑液残碱7.0 g/mL,撕裂指数8.2 mN.m2/g,抗张指数48.79 N.m/g,耐破指数3.31 kPa.m2/g。川滇桤木具有良好的生态功能,营造人工林后,林分生物多样性增加,林地的水湿条件得到改善,其人工林群落特征与亚热带常绿阔叶林一致,改良林地土壤的效果良好,能提高林地土壤的肥力。

Alnus crernastogyne cv. yanshan is a eco-economical pulp species suitable for developing at subtropical areas, or mixed planting with eucalyptus, and to be the replaceable species for degraded eucalyptus plantations. Alnus crernastogyne cv. yanshan has good environmental adaptability, grows fast, and can adapt to many kinds of site conditions, the average annual growth increment of both height and diameter surpass 1. The timber of Alnus crernastogyne cv. yanshan has good pulp quality, the timber density, fiber length, ratio of fiber length to width, holocellulose content, benzene-alcohol extract, screened yield, residual alkali in paper pulp black liquor, tear index, tensile index, burst index were 0.48 g/cm^2 , 1.19 mm, 91.47, 87.17 % , 2.56 % , 43.6 % , 7.0 g/mL, 8.2 mN . m^2/g, 48.79 N . m/g, 3.31 kPa . m^2/g respectively. The ecological function of Alnus crernastogyne cv. yanshan is promising, after plantation construction, the biodiversity increases, the water condition of soil is improved, the community characteristics is similar with subtropical ever-green broadleaved forest. Moreover, the Alnus crernastogyne cv. yanshan plantation has good effect on soil fertilizer improvement.