无患子树体合理光环境及高光效调控  

Reasonable Canopy Light Intensity and High Light Efficiency Regulation of Sapindus mukorossi

作　　者：高媛[1] 贾黎明[1,2] 高世轮 苏淑钗[1] 段劼[2] 翁震 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083 [2]北京林业大学国家能源非粮生物质原料研发中心,北京100083 [3]福建源华林业生物科技有限公司,三明354500

出　　处：《林业科学》2016年第11期29-38,共10页Scientia Silvae Sinicae

基　　金：科技部国家国际科技合作专项项目(2014DFA31140)

摘　　要：【目的】在揭示无患子冠层合理光环境的基础上进行树体调控技术主要参数的研究,为解决无患子生物质原料林低产问题提供理论和技术支撑。【方法】通过2年无患子自然树体冠层光环境的分区系统测定,设置骨干枝数目、骨干枝开张角度、结果枝数量及交互等试验,以花枝数量和果实产量为指标开展研究。【结果】1）自然树体树冠光环境不合理,内膛光照度仅为空地光照的10%-15%;经过树体结构调整后年均内膛光照度与产量的关系模型为y=-0.011 9x2＋5.926 3x-565.37（R2=0.738 38）,最佳光照度的范围（200-270）×100 lx。2）根据自然树体光照度双峰变化幅度可佐证无患子的主要物候期,5月份为生殖生长前期,急需大量营养,形成第1个光照度高峰;6月份展叶完成,进入果期,光照度形成第1个低谷;8月份逐渐开始落叶,光照度形成第2个高峰即为生理落果期,之后下降并进入平稳阶段。3）依靠不同部位光照度分布比例进行修剪,一般修剪后外围光照度占空地光照度的40%-54%,中部为32%-35%,内膛光照率为27%-31%,可比不处理的光照度提高2-3倍,使得树体内光照利用效果最佳,促进产量提高。4）设置不同的骨干枝数目（留3,4,5骨干枝）、开张角度（30°,45°,60°及90°）以及单位投影面积留枝量（1 m2保留8-20个结果枝）处理,发现：3骨干枝及5骨干枝的辐射状分布可有效提高光照度,为对照的2-3倍;4骨干枝的光照度及产量均处于最低;5骨干枝产量以25%的速率逐年下降,而3骨干枝产量呈现连年稳定的趋势。开张角度90°处理后当年产量最高,但以50%的速率呈现连年下降的趋势,易出现早衰现象;45°处理3年产量一直最低;60°处理后产量及连年光照度稳定变化趋势优于其他处理。单位投影面积保留16-18个结果枝时以347 g·m-2的产量显著高于其余处理。【结论】3骨干枝、60°开张角度和每m2投影面积�【Objective】In this study,the tree control technology was applied in order to solve low yield of Sapindus mukorossi biodiesel feedstock forest. This paper is focus on revealing tree canopy with improper light intensity,and hence provides the theoretical and technical support.【Method】The light illumination in different parts of naturally growing trees was measured for 2 years. The number of flowers and fruit yield index,controlling opening angle and number of backbone branches, thinning out of fruiting-shoot were measured and two-factor interaction validation was conducted in this research.【Rusult】1） The light intensity of naturally growing trees were unreasonable—the interior canopy light intensity was only 10% to 15% of the space’s. A model was established between light intensity and yield after regulating the canopy structure,y =- 0. 011 9x2＋ 5. 926 3x- 565. 37（R2= 0. 738 38） and the best light intensity could range from（200- 270） × 100 lx. 2） The main phenological phases could also be inferred according to double peaks of light intensity of the naturally growing trees’ canopy. In May,at the reproductive growth prophase,trees badly need nutrition,and form the first peak of light intensity. In June,in the turning process from the leaves-sprout stage to the fruit-set stage,the light intensity becomes to a lower level. In August,with leaves falling gradually,light intensity increases to the second peak and then enters into a relatively stable phase. 3） Trimming and pruning operations could be determined by different light distribution proportion. Generally speaking,compared with the space’s light intensity,exterior canopy’s is 40%- 54%,central canopy’s is 32%- 35%,and interior canopy’s is 27%- 31% after pruning,which may increase the yield by two or three times and make use of light effectively. 4） The experiment was conducted by setting up different backbone branches numbers（3,4,5）,opening angles（30 !,45 !,60 !,90 !） and leaving fruiting branches（8- 20）. The

关 键 词：无患子 生物质原料林 冠层光照度 整形修剪 树体管理 

分 类 号：S718.43[农业科学—林学]