内蒙古草原大针茅群落地上生物量与降水量的关系  

The relationship between aboveground biomass and precipitation on Stipa grandis steppe in Inner Mongolia

作　　者：蔡学彩[1] 李镇清[1] 陈佐忠[1] 王义凤[1] 汪诗平[1] 王艳芬[1] 

机构地区：[1]中国科学院植物研究所植被数量生态学重点实验室

出　　处：《生态学报》2005年第7期1657-1662,共6页Acta Ecologica Sinica

基　　金：中国科学院知识创新工程资助项目(KSCX2-SW-107;KSCX-1-08)~~

摘　　要：根据中国科学院内蒙古草原生态系统定位研究站在大针茅样地(面积500m×500m,地理坐标43°32′20″～43°32′40″N116°33′00″～116°33′30″E)的地上生物量与气候观测资料,利用SPSS分别进行大针茅群落地上生物量与年降水量、月降水量关键时期(4～6月份与6～8月份)降水量以及1～7月份总降水量的相关分析;对年降水量接近的1982、1983和1989年(分别为283.2mm,289.9mm,287.2mm)的地上生物量进行方差分析;运用积分回归模型模拟了降水的季节分配对群落生物量的影响。结果表明:(1)群落生物量的年际变化与年降水、月降水、关键时期降水(4～6月份和6～8月份)以及1～7月份降水量的变化没有显著的相关性(p>0.1);(2)在年降水量接近的年份,群落的地上生物量之间存在显著差异。降水量季节分配的变化对地上生物量的影响还有待于进一步研究。Data of precipitation and aboveground biomass in sampling plots of 500 m × 500 m were obtained from the Inner Mongolia Grassland Ecosystem Research Station of the Chinese Academy of Sciences, located at 43°32′20″N - 43°32′40″N.116°33′00″E - 116°33′30″E. From this database, we analyzed the relationship between aboveground biomass and precipitation. either annually, monthly, from April-June, June-August, or January-July, using correlation of SPSS software. In addition, differences between the aboveground biomass （5 replicates） in three years with highly similar precipitation （1982, 1983 and 1989, 283.2 mm, 289.9 mm, 287.2 mm, respectively） were analyzed with one-way ANOVA. Finally, based on 17 years of observations, we established an integral regression model with two variables： the aboveground biomass of the community and the precipitation for every 10-day-period from January to August. This model was used to analyze the influence of the seasonalal location of precipitation on aboveground productivity. Results indicated that （1） there were no significant correlations （p 〉0.1） between aboveground biomass and the annual, monthly, April-June, June-August, or January July precipitation; （2） in years with similar precipitation, aboveground biomass was still significant different. The relationship between annual fluctuation of aboveground biomass and seasonal allocation of precipitation should be further investigated.

关 键 词：内蒙古 大针茅草原 降水 地上生物量 

分 类 号：S812[农业科学—草业科学]