关键词: 根田鼠, 消化道, 营养, 适应对策

Abstract: The animal gut morphology is closed related to foo habit,food quality and energy need．The seasonal changes in length and weight of total and separate organs of digestive tract in root vole (Microtus oeconomus)，which lived in Qinghai-Tihetan plateau，was determined．It was showed that the length，weight of with content,empty and dry tissues of total and every organs (stomach，small intestine,large intestine and caecum )of root vole gut had significant seasonal variations．Each index was the lowest in exeuheranee period，which is moderate to vole，while in green up and／or whithering period，which the fiber content is high in food and-temperature is low ，all indexes were higher．The responsive magnitude of each organ was different and the small intestine responded strongly to the seasonal acclimatization．This suggested that the adjustment in morphology and capacity of digestive tract is important in animals digestive strategies．Diferent organs showed diferent responses to different stress，similarly，different pressure have a different effeet to the digestive tract．0ur results indicated that root vole have the ability physiologically to adapt the high-fiber food and lowtemperature environment in their natural habitats．

Key words: Microtus oeconomus, Gut morphology, Nutrition, Adaptive strategies