大宽行桉树人工林混农系统中桉树生物量特征比较研究  

Study on Biomass of Eucalyptus Plantation with Different Width of Row Distances in an Agroforestry System

作　　者：曹磊[1] 余雪标[1] 杨怀[1] 刘志平[1] 李宝琦[1] 

机构地区：[1]海南大学环境与植物保护学院,海南儋州571737

出　　处：《热带作物学报》2010年第7期1192-1199,共8页Chinese Journal of Tropical Crops

基　　金：海南省重点科技项目"热带桉树人工林林农复合生态经济系统研究"(05102);国家科技支撑计划课题之子课题"桉树相思速生纸浆林可持续经营管理技术研究"(2006BAD32B02);雷州林业合作项目;海南大学重点项目"桉树林农复合经营系统技术研究与示范"(HD09XM53)资助

摘　　要：采用分层切割法和标准枝法对尾巨桉单株和林分生物量、生物量结构特征和林分生产力进行研究。结果表明:不同种植模式中,桉树的枝、叶量均随着带距的增加而增加;同一种带距中,则随着株距的增大而增大。各种种植模式中桉树树冠与对照相比,均呈现较严重的"偏冠"现象,带外树冠生物量比带内树冠大25.35%～308.45%,但随株距的加大而减小。宽带行桉树的最低枝下高与对照相比,明显偏低,证明宽带行桉树的树冠长度大于对照。桉树平均单株的生物量也随着带距的增加而增加。除8 m带距比对照小2.5%～10.9%,其余模式均大于对照10.2%～23.07%。干材生物量所占比例随带距增大而减小,同种带距随株距增大而减小。林分生物量整体上株距8 m>14 m>16 m>对照;平均比对照分别大42.1%、11.8%、15.7%。从生物量结构特征中可知,14 m和16 m带距的4种模式林分较为稳定。8 m带距的3种种植模式林分差异较大。不同种植模式间桉树的生产力存在明显差异,均随着株行距增大呈增大趋势。其中,8 m带距的种植模式最高,总量比对照高33.42%～56.13%。The biomass structural characteristics of Eucalyptu urophylla x E.grandis, biomass of plant and stand, stand productivity were studied by layered cut and standard branches. The results showed that the contents as branches and leave of Eucalyptus accrued with the increase of belts distance in different cultivation patterns, and it accrued with the increase of plant spacing at the same belts distance. Various cropping patterns in Eucalyptus canopy compared with the control showed a serious ＂partial crown＂ phenomenon, the biomass of outer band crown was larger than the inner ones by 25.35%-308.45%. But the increment became smaller with the increase of spacing distance. It was obviously lower concerning about minimum canopy height of broadband line Eucalyptus compared with the control, it had been proved that the crown heights of broadband lines eucalyptus was longer than the control. Eucalyptus biomass per plant also accrued with the increase of band distance. In addition to 8m band distance being smaller than the 2.5%- 10.9% in control, and the remaining models were 10.2%-23.07% greater than the control. Biomass as a whole is 8 m〉14 m〉16 m〉control, larger than the control by 42.1%, 11.8% and 15.7%. It could be seen four models in 14 m and 16 m band distances were stable from structural characteristics of biomass, three kinds of cropping patterns in 8 m band distances were significantly different. There existed significantly different productivity of eucalyptus between different cropping patterns. It also tended to ascend along with the increased spacing. The productivity of 8m from the cropping patterns was the highest outputs, the aggregate output were higher than the control by 33.42%-56.13% .

关 键 词：大宽行桉农间作 桉树 生物量 生物量结构特征 生产力 

分 类 号：S79[农业科学—林木遗传育种]