锡林郭勒盟天然草地牧草气候生产力对气候变化的响应

发布时间：2018-03-01 02:37

本文关键词： 温度降水牧草气候生产力锡林郭勒不同草原　出处：《内蒙古农业大学》2015年硕士论文　论文类型：学位论文

【摘要】：通过内蒙古锡林郭勒盟三种草地类型区即典型草原的乌珠穆沁草原、荒漠草原的苏尼特草原和农牧交错带太仆寺旗和多伦县近40年的年均气温、降水量数据的搜集整理,利用Thornthwaite Memorial模型计算出三种草地类型区的牧草气候生产力。对三种草地类型区所包含的6个旗县近40年的年均气温、年降水量、牧草气候生产力数据汇总,并进行方差分析、相关分析和回归分析。结果表明：(1)近40年锡林郭勒盟三种草地类型区的大气温度呈增加趋势,降雨量在前30年内增加,而后10年降低。牧草气候生产力与降水的变化趋势一致。(2)年均气温、年降水量对牧草气候生产力的相关性极其显著,年均气温对牧草气候生产力的相关系数为-0.37599,对年降水量的相关系数为-0.43793；年降水量对牧草气候生产力的相关系数为0.95715。(3)锡林郭勒盟三种草地类型的牧草气候生产力受温度和降水的影响,其中降水是影响牧草生产力的主导因子。随着年降水量的增加,三种草地类型区牧草气候生产力增加。农牧交错带及典型草原区的西乌珠穆沁旗牧草气候生产力随着年均温的增加而增加,而对于典型草原区的东乌珠穆沁旗和荒漠草原区,当年降水量低于某个阀值时,牧草气候生产力随温度的增加而减小；当年降水量高于阀值时,牧草气候生产力随温度的增加而增加。
[Abstract]:Through the collection of annual average temperature and precipitation data of the three grassland types in Xilinguole League of Inner Mongolia, namely, the typical grassland of Wuzhimuqin steppe, the desert steppe of the Sunita steppe and the farming-pastoral interlaced belt Taipusi Banner and Duolun County, the annual average temperature and precipitation data have been collected and collated. The climatic productivity of forage grass was calculated by Thornthwaite Memorial model. The annual average air temperature, annual precipitation and climatic productivity of forage grass in the six flag counties of the three grassland types were collected, and the variance analysis was carried out. The results of correlation analysis and regression analysis showed that the atmospheric temperature of the three grassland types in Xilinguole League increased in the last 40 years, and the rainfall increased in the first 30 years. The annual air temperature and annual precipitation were significantly correlated with the climatic productivity of forage. The correlation coefficient between annual air temperature and forage climate productivity is -0.37599, the correlation coefficient for annual precipitation is -0.43793, and the correlation coefficient between annual precipitation and forage climate productivity is 0.95715.93. The effects of temperature and precipitation, Precipitation is the main factor affecting forage productivity. With the increase of annual precipitation, The climatic productivity of herbage in the three grassland types increased with the increase of annual mean temperature, but for the eastern Uzhimuqin flag and desert steppe in the typical steppe, the climatic productivity increased with the increase of annual mean temperature in the farming-pastoral ecotone and the typical grassland. When the precipitation was below a certain threshold, the climatic productivity of forage decreased with the increase of temperature, and when the precipitation was above the threshold, the climatic productivity of forage increased with the increase of temperature.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S812

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