大样地循环采样的草地生物量空间异质性及误差分析  

Heterogeneity and Error Estimation of Grassland Biomass Based on Cyclic Sampling Approach

作　　者：邴龙飞[1,2] 邵全琴[1] 王军邦[1] 刘纪远[1] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]中国科学院研究生院,北京100049

出　　处：《草地学报》2012年第2期257-267,共11页Acta Agrestia Sinica

基　　金：国家科技支撑项目(2009BAC61B01)资助

摘　　要：利用2008年和2010年青海省草地生物量野外采样结果,用变差函数探讨地下和地上生物量的空间变异情况,二者存在空间相关性的阈值分别为3720.52和2258.7 5m。结果表明:玛多采样点前后2年地上生物量的变异程度都高于海北;2010年各样地地上生物量变化相对较小。珍秦/巴塘平均地下生物量高于海北地下生物量,玛多平均地下生物量最小;海北和玛多前后2年平均地下生物量年际间变异程度低于珍秦/巴塘样地。对海北、玛多、巴塘和珍秦的地下、地上生物量的误差进行分析,地下生物量和地上生物量误差变异不同。研究不同采样距离对误差的影响发现,随着采样距离的加大,不论地上还是地下生物量,其误差总体呈增加的趋势,但在2500m采样间距下,地下生物量、地上生物量以及二者的比值都出现较为明显的低值。From cyclic sampling results of 2008 and 2010 in Qinghai,variogram parameters were used to describe the heterogeneity of above-ground biomass and below-ground biomass.The spatial correlation threshold was 2258.75 and 3720.52 m,respectively.The variation of above ground biomass was greater in Maduo than in Haibei for two years.The variation of above-ground biomass for all the sampling points was smaller in 2010.The below-ground biomass was larger in Zhenqin and Batang than in Haibei for 2008 and 2010.The smallest below-ground biomass was in Maduo.The interannual variation of mean below-ground biomass was smaller in Haibei and Maduo than in Zhenqin and Batang.Estimation errors of both above-ground biomass and below-ground biomass were quite different.The estimation errors increased for both above-ground biomass and below-ground biomass as the sampling distance increased.The lowest value of above-ground biomass,below-ground biomass and their ratios were all at the sampling distance of 2500 meters.

关 键 词：循环采样 生物量 误差 样方调查 空间异质性 

分 类 号：Q-9[生物学] Q948