刈割强度对不同根型苜蓿主要非结构性碳水化合物含量的影响  

Effects of different cutting intensities on main non-structural carbohydrate content of different root-type alfalfa

作　　者：李冰月 南丽丽[1] 温素军 张亚楠 陈洁[1] 朱海花 LI Bingyue;NAN Lili;WEN Sujun;ZHANG Yanan;CHEN Jie;ZHU Haihua(College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem,Ministry of Education, Lanzhou, Gansu 730070, China)

机构地区：[1]甘肃农业大学草业学院/草业生态系统教育部重点实验室,甘肃兰州730070

出　　处：《干旱地区农业研究》2021年第2期172-177,210,共7页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金(31460630);现代农业产业技术体系建设专项(CARS-34)。

摘　　要：本研究以直根型‘陇东’紫花苜蓿、根蘖型‘甘农2号’杂花苜蓿和根茎型‘清水’紫花苜蓿为试验材料,设置4个刈割强度(距离上次刈割恢复生长分别为20、27、34、41 d),研究不同刈割强度对各根型苜蓿根、茎、叶的贮藏营养物质含量(可溶性糖、蔗糖、淀粉、还原性糖)的影响,为探明不同根型苜蓿刈割后翌年再生状况,为其合理有效利用提供理论依据。结果表明:6月份可溶性糖含量在叶中最高,还原性糖含量在茎中最高,淀粉和蔗糖含量在根中最高,其均值分别为5.75%、2.32%、3.16%、4.38%;9月份可溶性糖、还原性糖、淀粉、蔗糖含量均在根中最高,其均值分别为18.43%、2.57%、5.78%、14.12%。不同根型苜蓿在每27 d刈割强度下可溶性糖、淀粉、蔗糖含量高于其他处理,在每41 d刈割强度下还原性糖含量高于其他处理。根蘖型‘甘农2号’杂花苜蓿和根茎型‘清水’紫花苜蓿秋季根的贮藏营养物质含量接近并高于直根型‘陇东’紫花苜蓿,表明根蘖型、根茎型苜蓿抗寒越冬性较强。Three alfalfa cultivars with different root types(rhizomatous root of Medicago sativa.cv.‘Qingshui’,creeping root of M.varia Martin.cv.‘Gannong No.2’,and tap root of M.sativa.cv.‘Longdong’)were used as experimental materials.The design was a completely randomized,four-cutting intensities(20,27,34,and 41 d from the last mowing)were set up to study the effects of different cutting intensities on storage of nutrients substances(soluble sugar,sucrose,starch,and reducing sugar)in root,stem,and leaf of different root-type alfalfa,and to provide theoretical support for the rational and effective utilization of different root types of alfalfa and the regeneration of alfalfa in the following year after the cutting.The results showed that soluble sugar was the highest in leaf,reducing sugar was the highest in stem,starch and sucrose were the highest in root in June,and the average content was 5.75%,2.32%,3.16%,and 4.38%,respectively.Soluble sugar,reducing sugar,starch,and sucrose contents peaked in rootin September,and the average contents were 18.43%,2.57%,5.78%,and 14.12%,respectively.The contents of soluble sugar,starch,and sucrose in different root-types alfalfa were higher than those in other treatments under cutting frequency of every 27 d,while reducing sugar content was higher than that in other treatments under cutting frequency of every 41d.The contents of stored nutrients of creeping root of M.varia Martin.cv.‘Gannong No.2’and rhizomatous root of M.sativa.cv.‘Qingshui’were close to and higher than tap root of M.sativa L.cv.‘Longdong’,which indicated that creeping rooted alfalfa and rhizomatous rooted alfalfa were more resistant to cold and winter.

关 键 词：刈割强度 苜蓿 根系类型 非结构性碳水化合物含量 

分 类 号：S551.7[农业科学—作物学]