气象因子与羊草生长高度的关系研究——以内蒙古草甸草原区为例

Study on the Relationship between Meteorological Factors and the Growth Height of Leymus chinensis——Taking the Meadow Steppe Area of Inner Mongolia as an Example

为研究1990—2017年内蒙古草甸草原羊草生长高度与主要气象因子之间的关系,根据内蒙古草甸草原气候特点,选取呼伦贝尔市牧业气象试验站1990—2017年历年5月1日—8月31日各旬降水、温度、日照时数及其相应累加值等6个水热环境参数变量,以及同期同地区羊草生长高度监测数据,建立羊草生长高度与主要气象因子关系模型,对羊草高度与气象因子之间的关系进行相关与回归分析。结果表明,羊草生长高度与返青日期呈负相关,与5月中旬降水量、6月中旬日照时数、5月1日—6月20日降水总量呈正相关;5月1日—6月20日降水总量可以影响到7月中旬羊草高度,是影响羊草高度年内最高值的重要气象因子;以旬为单位通过逐步回归的方法建立了各旬羊草生长高度与气象因子的关系模型。研究结果为该地区草地植物生长动态变化研究提供了基础数据。

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.