油蒿群落初级生产力动态规律研究  

STUDY ON DYNAMIC STATE OF PRIMARY PRODUCTIVITY IN ARTEMISIA ORDORSICA COMMUNITY

作　　者：刘金祥[1] 仇保铭[1] 张志谦[1] 吴彦龙 

机构地区：[1]中国科学院兰州沙漠研究所 [2]宁夏盐池县草原站

出　　处：《西北植物学报》1998年第1期116-123,共8页Acta Botanica Boreali-Occidentalia Sinica

摘　　要：油蒿群落初级生产力年度变化范围在４６５．４５－９１２．１５ｋｇ／ｈｍ２，变幅为１９６％。据相关分析，制约本区油蒿群落初级生产力主要因素是土壤水分和热量，尤其是４月份、５月份土壤水分、６月份温度及蒸发量等，也可根据上述单因子预测群落初级生产力。群落初级生产力积累动态呈单峰值曲线，大体可分为“缓增型”和“急增型”两种。缓增型模式符合Ｌｏｇｉｓｔｉｃ曲线方程，急增型模式符合反函数曲线方程，该群落衰减动态呈“斜坡”状曲线，进入枯草期衰减速率明显降低，这是枯草期油蒿群落初级生产力保存量较高的主要原因。The primary productivity per year varies from 465.45 kg/hm 2 to 912.15 kg/hm 2.According to the variation of annual precipitation (particular the rainfall from October last year to April this year and the rainfall in July),soil moisture in April and May,air temperature and evaporation in June of growing season in Artermisia ordorsica community,the primary productivity can be calculated in advance through regression analysis for the single factor.Dynamic state of the accumulated primary productivity is in conformi ty with in single peak value.It can be devided into two models of “slowly increasing model and fast increasing model” which fit in with the Logistic equation and the anti function equation,respectively,in the growing season.Attenuation curve of the primary productivity have the shape of “Hypotenuse” and the attenuate rate decreases remarkably compared with the accumulated rate in the non growing season.

关 键 词：油蒿 初级生产力 回归模型 

分 类 号：S543.902[农业科学—作物学]