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

doi:10.11733/j.issn.1007-0435.2012.02.010

›› 2012, Vol. 20 ›› Issue (2): 257-267.DOI: 10.11733/j.issn.1007-0435.2012.02.010

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

BING Long-fei^1,2, SHAO Quan-qin¹, WANG Jun-bang¹, LIU Ji-yuan¹

1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received:2011-10-13 Revised:2011-12-20 Online:2012-04-15 Published:2012-07-05

大样地循环采样的草地生物量空间异质性及误差分析

邴龙飞^1,2, 邵全琴¹, 王军邦¹, 刘纪远¹

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

通讯作者: 邵全琴,E-mail:shaoqq@lreis.ac.cn
作者简介:邴龙飞(1979- ),男,山东青岛人,博士,研究方向为区域水热平衡,E-mail: binglf@lreis.ac.cn
基金资助:
国家科技支撑项目(2009BAC61B01)资助

Abstract

Abstract: 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.

Key words: Cyclic sampling, Biomass, Error, Quadrat survey, Spatial heterogeneity

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 5 m。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2500 m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。

关键词: 循环采样, 生物量, 误差, 样方调查, 空间异质性

CLC Number:

BING Long-fei, SHAO Quan-qin, WANG Jun-bang, LIU Ji-yuan. Heterogeneity and Error Estimation of Grassland Biomass Based on Cyclic Sampling Approach[J]. , 2012, 20(2): 257-267.

邴龙飞, 邵全琴, 王军邦, 刘纪远. 大样地循环采样的草地生物量空间异质性及误差分析[J]. , 2012, 20(2): 257-267.

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

大样地循环采样的草地生物量空间异质性及误差分析

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