宁夏天然草地气象因子与草地初级生产力关系研究

气象因素是天然草地初级生产力的主要制约因素,为了解各气象因子对天然草地初级生产力的制约效应,利用主成分综合因子得分和灰色关联度分析理论对宁夏天然草地气象质量进行了综合评价,并对天然草地初级生产力与各气候因子间的相互关系进行了关联分析。结果表明:宁夏干旱地区13个市县天然草地的气象质量可以划分为3个等级,半干旱区6个市县天然草地的气象质量可以划分为2个等级。限制宁夏干旱区天然草地初级生产力最主要的气象因子是4-9月降水量,其次是年降水量、湿润度和年蒸发量;宁夏半干旱区天然草地初级生产力最主要的限制气象因子是湿润度,其次是4-9月降水量、年降水量和无霜期。

Relationship between Meteorological Factors and Primary Productivity of Natural Grassland in Ningxia

Meteorological factors are critical issues restraining primary productivity of natural grassland.In order to understand the restrained effects of meteorological factors on primary productivity,a comprehensive evaluation of the climate quality in Ningxia grassland and mutual relations between the primary productivity of natural grassland and various climatic factors have been analyzed using integrated principal component factor scores and gray correlation analysis.Results showed that meteorological quality of the arid natural grassland in thirteen cities and counties of Ningxia could divide into three grades;meteorological quality of the semi-arid natural grassland of six cities and counties of Ningxia can be divided into two grades.The most important meteorological factor restraining Ningxia primary productivity of natural grassland in arid areas is precipitation from April to September,followed by annual precipitation,humidity,and annual evaporation.In contrast,the most important meteorological factor in semi-arid regions is humidity,followed by precipitation from April to September,annual precipitation and frost-free period.