关键词: 气象因子;羊草高度;相关分析

Abstract: The objective of this study was to assess the relationship between primary meteorological factors and growth height of Leymus chinensis in meadow steppe of Inner Mongolia from 1990 to 2017. According to the climate characteristics of meadow grassland in Inner Mongolia, a total of six parameters associated with hydrothermal environment, including precipitation, temperature, sunshine hours and their corresponding accumulated value, of each ten-day period during May 1 to August 31 of each year from 1990 to 2017 were selected. The relational model of primary meteorological factors and growth height of Leymus chinensis was established using the above six variables and the contemporaneous monitoring data of growth height of Leymus chinensis. The correlation and regression analysis were employed to assess the relationship between primary meteorological factors and growth height of Leymus chinensis. The results showed that the growth height of Leymus chinensis was negatively correlated with the date of re-greening, and was positively correlated with the amount of precipitation in the middle ten days of May, the number of sunshine hours in the middle ten days of June, and the total amount of precipitation from May 1 to June 20; the height of Leymus chinensis in the middle ten days of July were impacted by the total amount of precipitation from May 1 to June 20 which was an important meteorological factor affecting the highest value of Leymus chinensis within the year; the relational model between the growth height of Leymus chinensis and meteorological factors for each ten-day period was established by using stepwise regression method in units of ten days. The results obtained in this study provide basic data for the research on dynamic characteristics of plants growth in meadow steppe area of this region.