Evaluation of wood quality characteristics of the afforestation trees planted in China deserts as woody resources

我国荒漠造林木本资源木材品质特性评价

基本信息

批准号：
13660166
负责人：
FURUKAWA Ikuo
金额：
$ 2.24万
依托单位：
Tottori University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

The purpose of this study is to estimate the amount of utilizable wood portion, that is, to evaluate the amount of juvenile wood portion within the trunks of the afforestation trees planted in arid or semiarid regions in China for combating desertification. The testing materials were collected from the two kinds of poplars stands, Populus simonii(Pos) as a native species and Populus beijingensis (Pob)as a hybrid species, and native pine (Pinus sylvestris var mongolica)(Pis)stands.First, wood quality characteristics were judged on the basis of the horizontal variation of two kinds of fiber length, that is, vessel-element length and wood fiber length. Good growth species of Pob showed 15 years earlier wood-quality maturation than that of slow growth species of Pos under non-irrigation conditions. Maturation age of Pos is promoted about 10 years under irrigation conditions. Slow-growth species of ~had large amount of juvenile wood portion, but this portion is able to reduce by promoting t … More he radial growth under irrigating conditions.Second, wood-quality variation was estimated by using vessel-diameter instead of fiber length. The vessel diameter is effective index for estimating wood-maturity within the poplar trunks, because horizontal variations of vessel-diameters showed similar tendency of vessel-element length and fiber length in Pos and Pob. The accuracy in decision of the demarcation of juvenile-and adult-wood, vessel diameter index is much better than vessel element length, because of less variation in each data plot.Third, crystals containing within the poplar woods, irrigated and no-irrigated Pos and Pob, were investigated. The crystals were existed intensively within the transition-wood region and heart wood portion, but none in sap wood portion. Native species of Pos had tendency to contain much crystals rather than Pob, however, this tendency is improved by applying irrigation.Forth, wood quality variation of Pis is very similar to the published data of pine trees grown intemperate zone. The maturing age was 23 to 25 years old. Less

本研究的目的是估算我国干旱半干旱地区防治荒漠化造林树木的可利用木材部分量，即评价其树干内幼年木材部分的数量。从两种杨林中，小叶杨（Pos）为乡土树种，北京杨（Pob）为杂交种，乡土松（Pinus）首先根据两种纤维长度的水平变化，即导管元长度和木纤维长度来判断木材的品质特征，Pob的良好生长树种表现出15年。在非灌溉条件下，木质成熟较慢生树种早，在灌溉条件下，慢生树种的成熟年龄可提高10年左右。部分，但这部分可以通过促进灌溉条件下的径向生长来减少。其次，通过使用容器直径而不是纤维长度来估计木材质量变化。容器直径是估计木材成熟度的有效指标。在杨树树干内，导管直径的水平变化在 Pos 和 Pob 中表现出导管元素长度和纤维长度的相似趋势，因此确定幼树和成年木材导管直径指数的准确性。比容器单元长度好得多，因为每个数据图的变化较小。第三，对灌溉和非灌溉的Pos和Pob杨树中含有的晶体进行了研究。晶体集中存在于过渡木材区域和区域。原生树种 Pos 的心材部分比 Pob 更倾向于含有较多的晶体，但边材部分则没有，但通过灌溉可以改善这种趋势。第四，Pis 的木材质量变化与已发表的非常相似。生长在温带地区的松树的成熟年龄为23至25年。