不同栽培密度下杂交桑产量及其组分

Effects of planting density on yield and components of hybrid mulberry

本研究通过分析桂桑优62号(Morus alba‘guiyou No.62’)在不同栽培密度(45 000、67 500、90 000、112 500株·hm-2)下枝条产量及其各部位分产量,以探索出最适合草本化栽培的密度,为建立高效桑树草本化栽培模式的研究提供基础数据。结果表明,桑树合理密植对桑枝产量影响显著,密度为112 500株·hm-2时条桑产量最高,达到61 672.50kg·hm-2,显著高于其余3个处理,草本化栽培密度以112 500株·hm-2为宜。随着栽培密度的增加,单株枝条数减少、茎秆变细、叶面积减小。桑叶是产量组成中最重要的部分,比例超过55%。各组分所占比例并未随栽培密度的增加而有显著变化,均表现为叶片比例>木质部比例>韧皮部比例。

To explore the most suitable planting density for herbaceous cultivation and provide foundation for efficient herbaceous cultivation models, yields of Dranch and other parts of hybrid mulberry（Guiyou No. 62） with different planting densities（45 000, 67 500, 90 000 and 112 500 plant· hm^2 were studied. The results showed that reasonable planting density affected the yield of mulberry remarkably. The highest yield was 61 672. 50 kg · hm-2,which was observed in treatment with a planting density of 112 500 plant· hm^2, and significantly different from the other 3 treatments. So an appropriate planting density for berbaceous cultivation is 112 500 plant · hm^2. Branches per plant, stein diameter and leaf area trended to decrease with the increasing of planting density. Mulberry leaf yield is the most important part of yield components, and take up over 50% of total yield. With the increasing of planting density, proportion of each component has no significant change, and it is leaf〉xylem〉phloem.