中国草地植被地上和地下生物量的关系分析  

ABOVE- AND BELOW-GROUND BIOMASS RELATIONSHIPS IN CHINA'S GRASSLAND VEGETATION

作　　者：马安娜[1] 于贵瑞[1] 何念鹏[1] 王秋凤[1] 彭舜磊[1] 

机构地区：[1]中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室中国生态系统研究网络(CERN)综合研究中心,北京100101

出　　处：《第四纪研究》2014年第4期769-776,共8页Quaternary Sciences

基　　金：中国科学院战略性先导科技专项项目-应对气候变化的碳收支及相关问题(批准号:XDA05050702)资助

摘　　要：草地生物量大部分集中在地下,地下生物量对于估算草地生态系统碳储量及其碳固持效应都至关重要。由于草地地下生物量数据缺乏,利用地下与地上的根冠比(R/S)或者地下与地上生物量的关系对草地地下生物量进行估算,是目前最常用的方法。本文在综述草地生物量研究进展的同时,利用2004~2010年已发表文献的草地生物量数据对中国不同类型草地的根冠比进行了探索,同时分析了不同类型草地的地上与地下生物量的相关关系(高寒草甸、高寒草原、山地草甸、温性草甸草原、温性草原和温性荒漠草原)。分析结果表明:不同类型草地的根冠比存在显著差异(F=3.524,p<0.01);进一步分析发现,山地草甸的根冠比显著低于其他类型草地(p<0.01),R/S较大的草地类型为温性草甸草原和温性荒漠草原,均值分别为7.0和6.8。对地上与地下生物量相关关系的分析表明,3种类型草地的地上与地下生物量存在幂函数相关关系,即高寒草原(R^2=0.67)>温性荒漠草原(R^2=0.36)>高寒草甸(R^2=0.13),其他3种类型草地几乎不存在地上与地下生物量的相关关系。这为以后估算地下生物量提供依据,即地下生物量估算应该综合考虑根冠比和地下与地上生物量关系。Large grassland biomass stores in belowground,which plays a significant role in ecosystem carbon store and carbon sequestration.Due to the lack of below-ground biomass data,Root：shoot ratio （R/S） or the relationship between above-ground biomass （AGB） and below-ground biomass （BGB） have been used to estimate belowground biomass.By available published grassland biomass data in 2004～2010,the paper explored the R/S and the relationship between above-and below-ground biomass in six grassland types,such as alpine meadow,alpine steppe,temperate desert steppe,temperate meadow steppe,montane meadow,temperate steppe.The results showed that R/S was significantly different in all grassland types （F =3.542,p＜0.01）,and R/S of montane meadow was significantly different from other grassland types （p＜0.01）.Temperate meadow steppe and temperate desert steppe had relatively higher R/S,the means of which were 7.0 and 6.8,respectively.There were evidence of positive effects of mean annual precipitation on AGB and BGB,and negative effects on R/S.The effects of mean annual temperature on AGB,BGB and R/S were different with that of mean annual precipitation.Although mean annual temperature had the positive effects on AGB,the effects on BGB and R/S were not significant.In order the better to analyze how to estimate BGB based on AGB,the paper explored the relationship between above-and below-ground biomass.The results showed that BGB was significantly positive correlated with AGB in alpine steppe （R2 =0.67） ＞temperate desert steppe （R2 =0.36） ＞alpine meadow （R2 =0.13）.The power function fitted well with the relationship between BGB and AGB for these three types of grassland.The relationship between above-and below-ground biomass was not found in other three types of grassland.It was evident that both R/S and the relationship between AGB and BGB must be considered together when BGB was estimated.

关 键 词：草地 地上生物量 地下生物量 根冠比 

分 类 号：Q148[生物学—生态学]