陕北地区12个饲料桑品种农艺性状及光合特性比较

打开文本图片集

中图分类号：S546 文献标识码：A 文章编号：0488-5368（2025）06-0006-07

Abstract： To identify suitable forage mulberry varieties for cultivation in northern Shaanxi，this study employedarandomized block designand comprehensively evaluatedthegrowth adaptabilityof twelve forage mulberry cultivars.A combination of correlation analysis，principal component analysis，stepwise regresion，and subordinate function analysis was used based on eleven growth indices.The coeficients of variation for the twelve varieties were ranked in descending order as follws：branch number，leaf width，leaf length，crown width，plant height，andstem diameter.Correlation analysis revealed significant positive correlations between leaf length and leaf width;transpiration rate and stomatalconductance；and water use eficiency with both net photosynthetic rate and transpiration rate.In contrast，branch number showed significant negative correlations with leaf length and leaf width.Principal component analysis reduced the eleven growth indices to four principal components，which collectively explained 91.48% of the cumulative variance. Based on subordinate function analysis and the mean scores of the principal components and subordinate functions，the ranking of the cultivars was as follows ： S2 = S3 > S7 > S6 = S8 > S1 = S4 > S9 > S10 > S11 > S12. Stepwise regresion analysis identified transpiration rate，plant height，and stem diameter as key indicators，accounting for 93% of the variation in the comprehensive score.These findings provide a scientific basis for guiding the selection of suitable forage mulberry varieties.

Key words：Northern Shaanxi；Mulberry；Photosynthetic characteristics； Comprehensive analysis

饲料桑（Morusalba）根系发达，抗逆性强，耐刈割，可草本化栽培[1]，适时收获，生物产量大，且营养丰富均衡2，对增加饲料蛋白供应，促进畜禽水产养殖减粮替代和减抗替代意义重大[3]。（剩余10374字）