短花针茅叶片热值及还原糖含量对载畜率的响应  

The response of leaf calorific value and reducing sugar to stocking rate of Stipa breviflora

作　　者：郑佳华 高峰 张峰 张彬 赵萌莉 ZHENG Jiahua;GAO Feng;ZHANG Feng;ZHANG Bin;ZHAO Mengli(College of Grassland,Resource and Environment,Inner Mongolia Agricultural University,Hohhot 010010,Inner Mongolia,China;Inner Mongolia Water Conservancy Research Institute,Hohhot 010051,Inner Mongolia,China)

机构地区：[1]内蒙古农业大学草原与资源环境学院,内蒙古呼和浩特010010 [2]内蒙古自治区水利科学研究院,内蒙古自治区,内蒙古呼和浩特010051

出　　处：《草业科学》2021年第9期1745-1752,共8页Pratacultural Science

基　　金：内蒙古自治区科技计划项目(2019ZD008);内蒙古自治区自然科学基金(2020ZD03);国家自然科学基金(31861143001);草地资源教育部重点实验室。

摘　　要：热值能够衡量植物体光合作用能力的强弱,还原糖可以通过氧化还原反应直接给植物供能,二者对植物返青和再生具有重要作用。本研究采取野外取样与室内分析相结合的方法,分析不同载畜率水平下短花针茅(Stipa breviflora)叶片热值、还原糖含量和干物质的变化及其之间的相关关系。结果表明:1)短花针茅叶片热值、还原糖含量及干物质重的变化趋势一致,均随着载畜率的增加而下降,且重度放牧较围封显著下降(P<0.05);2)在不同月份之间短花针茅叶片热值和干物质重的变化一致,均随时间的推移显著增加(P<0.05),而叶还原糖含量先降低再升高;3)叶片热值与干物质呈极显著正相关关系(P<0.001),而叶还原糖与干物质呈显著负相关关系(P<0.05)。研究结果表明,围封有利于草地中的能量向短花针茅中移动,进而促进其生长发育,有利于维持和改善荒漠草原生态系统。The use of calorific value as a measure of photosynthesis in plants and the ability of reducing sugars to directly supply energy to plants through redox reactions,both play an important role in plant regreening and regrowth.In this study,field sampling and laboratory analysis were used to analyze the calorific value,reducing sugar content,and dry matter weight of Stipa breviflora under different stocking rates;correlations between the variables were also assessed.Results showed that 1)Calorific value,reducing sugar content,and dry matter weight decreased consistently with increasing stocking rate.Heavy grazing also decreased significantly when compared with enclosure(P<0.05).2)Leaf calorific value and dry matter weight changed at a consistent rate throughout the study,with no variation between months;both increased significantly with time(P<0.05).Reducing sugar content decreased initially and then increased.3)There was a significant positive correlation between leaf calorific value and dry matter weight(P<0.001),and a significant negative correlation(P<0.05)between reducing sugar content and dry matter weight.These results demonstrate that enclosure promotes the transfer of energy from grasslands to S.breviflora and encourages growth and development,indicating its importance in maintaining and improving the desert grassland ecosystem.

关 键 词：热值 还原糖 放牧 干物质 

分 类 号：S812.5[农业科学—草业科学]