引用格式：，等.干燥方式与时间对天然牧草营养品质和叶绿素含量的影响[J].草地学报，2025，33 （7）：2368-2373 LIU Jian-liang，JIAYu-shan，GEGen-tu，etal.TheEfectsofDrying Methodsand Drying Time on theNutritional Quality and Chlorophyll Content ofNatural Grassland Forage[J]. Acta Agrestia Sinica，2O25，33（7）：2368-2373

关键词：天然牧草；营养品质；叶绿素含量；干草调制；干燥方式中图分类号：S816 文献标识码：A 文章编号：1007-0435（2025）07-2368-06

The Effects of Drying Methods and Drying Time on the Nutritional Quality and Chlorophyll Content of Natural Grassland Forage

LIU Jian-liang1， JIA Yu-shanl*，GE Gen-tu1，WANG Zhi-jun1， SI Qiang1，SONG Chao-ran MA Wei-qin¹，SHENG Pan-jie1，ZHAO Jia-yu1，ZHOU Yu-lei²

（1.College ofGrassand Science，InnerMongolia Agricultural University，KeyLaboratoryofForage Cultivation，Processing， andEfficient Utilization，MinistryofAgriculture and RuralAffairs，Hohhot，Inner Mongolia Olool9，China; 2.Chifeng University，Chifeng，Inner Mongolia O24ooo，China）

Abstract：This study aimed to investigate the effects ofvarious drying times and methods on the nutritional quality and chlorophyll contents of natural grassland forage during the drying process.The experimental materials comprised natural forage sourced from a representative area in Xilin Gol League， Inner Mongolia. Two drying methods were implemented： shade drying and natural drying. Samples were collcted at intervals of ^0h ， 12h ， 24h ， 36h ， 48h ！ 60h ，and 72h .The chlorophyll contents（including chlorophyll a，chlorophyll b，and total chlorophyll）and nutritional quality of the forage were analyzed under these varying conditions.Results indicated that forages dried using the shade method exhibited significantly higher levels of chlorophyll，dry mater （DM），and crude protein（CP）compared to those dried naturally. Furthermore，as drying time increased，a downward trend was observed in chlorophylla，chlorophyll b，total chlorophyll，DM，and CP，while the concentrations of acid detergent fiber（ADF）and neutral detergent fiber（NDF）increased．The interaction between drying time and method significantly influenced both chlorophyllcontents and nutritional quality （ Plt; O.05）.In conclusion，comprehensive analysis indicates that，under favorableconditions，shadedrying is recommended as the optimal method for hay preparation in the typical grasslands of Xilin Gol League.

Key words：Natural forage;Nutritional quality; Chlorophyll content;Hay preparation;Drying method

天然草地牧草是草食牲畜的重要饲草来源，对草原畜牧业的健康、稳定发展起着至关重要的作用。我国是仅次于澳大利亚的世界第二大草地资源国，拥有各类草地面积约为400万 hm² ，天然草原牧草是草食家畜重要饲料来源[1。天然草地的主要利用方式包括刘割和放牧，刘割后的天然草通常进行干燥处理调制干草[2]。不同的干燥方法和干燥时间是影响饲草调制质量的关键因素。牧草的主要干燥方法有自然干燥、物理干燥、化学干燥和人工干燥[3]。有研究表明[4-6]，人工热风干燥牧草营养品质最佳，平摊自然晒干牧草营养品质最差。干燥过程中存在诸多不可控因素（如天气状况），其中太阳光直射可能破坏饲草中的粗蛋白，并且阳光中的紫外线和热量会导致叶绿素、胡萝卜素和蛋白质降解，特别是在长时间暴露的情况下，太阳光等天气因素不仅会降低饲草的营养价值，还可能影响饲草整体品质。在经过田间自然干燥后牧草中水分迅速散失，使得牧草叶片干燥易碎，在收获过程中叶片大量脱落，影响干草的营养品质。

我国天然草原主要集中在北方，内蒙古地区的草原面积内占据全草地面积的 1/4 ，但由于内蒙古大部分地区天然牧草刈割时正值雨季，不合理……