雨淋对苜蓿干燥过程中营养品质及真菌菌群结构的影响

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中图分类号：S816 文献标识码：A 文章编号：1007-0435（2025）07-2132-08

引用格式：，等.雨淋对苜蓿干燥过程中营养品质及真菌菌群结构的影响[J].草地学报，2025，33（7）： 2132—2139 LIU Li-ying，WANG Yu-zhi，LIU Zhi-gang，et al. Efects of Rainfallon Nutritional Quality and Fungal Community Structure in Alfalfa During Drying Process[J]. Acta Agrestia Sinica，2O25，33（7） ：2132—2139

Effects of Rainfall on Nutritional Quality and Fungal Community Structure in Alfalfa During Drying Process

LIU Li-ying1，WANG Yu-zhi1，LIU Zhi-gang²，LIU Hong-mei1， YANG Yi-wen1，DING Xia 3 ， SUN Lin4* （1.IerogoldtrcybtKbto andEngieignaoteogoliai；ergoliatooueiotalogaid substatioda goliaO102o，ina;4ergoladegiculturalndimalHusbadrieesotrongolia）

Abstract：exposing rain is very easy to cause mildew and deteriration during the drying process of the second and thirdcutings of alfalfa hay innorthern areas.To investigate the impactof rainfallon thenutritional quality and fungal community succession in alfalfa （Medicago satioa L.）during the drying process，this study analyzed the moisture content，nutritional components，and fungal diversity in alfalfa under rain-exposedand rain-free conditions.The findings revealed that rainfallat theharvest stage extended the drying period by 3to 4 days.At the ninth day of drying，the concentrations of crude protein（CP），soluble protein （SP），and water-soluble carbohydrates（WSC）in the exposed-rain group significantly decreased by 6.49% ， 0.92% ，and 0.83% ，respectively，while neutral detergent fiber （NDF） and acid detergent fiber （ADF） significantly increased by 3.60% （20号 and 3.81%（P<0.05） ，respectively，compared to the non-rain group. As the drying duration extended，DM， NDF，and ADF levels significantly increased，whereas CP，SP and WSC levels significantly decreased in both groups. Seven predominant mold genera（Alternaria，Mycocentrospora，Ascochyta， Fusarium，Moesziomyces，Stemphylium，Cladosporium）were identified on the surface of the hay during the drying process.Rainfall increased the sum abundance values of the 7 types of fungi in alfalfa hay by 13.89% . Additionally，Mycocentrospora exhibited an extremely significant negative correlation with CP and significant negative corelations with SPand WSC. In summary，rainfallsignificantly prolonged the drying timeof alfalfa，and exacerbated the loss of nutrients and the risk of mildew.

Key Words： Rainfall; Drying ;Alfalfa;Nutritional quality ; Fungi

紫花苜蓿（MedicagosatiuaL.）作为栽培面积最大的全球性优质饲草和现代草牧业发展的首选牧草[1]，其产业化水平和经济价值最高，在现代畜牧业发展中具有重要战略意义。（剩余12323字）