东北落叶松和南方马尾松地下生物量模型研建
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第33卷第2期2011年3月北京林业大学学报JOURNAL OF BEIJING FORESTRY UNIVERSITY
Vol.33,No.2Mar.,2011
收稿日期:2010--04--28基金项目:国家林业局专题“基于清查资料的中国森林植被生物量和碳储量评估”、科技部农业科技成果转化资金项目(05EFN216700395)。
第一作者:曾伟生,博士生,教授级高级工程师。主要研究方向:森林资源监测和林业数表研制。电话:010--62889261Email :zengweisheng@
地址:100091北京市海淀区东小府1号中国林业科学研究院资源信息研究所。
责任作者:唐守正,研究员,博士生导师,院士。主要研究方向:森林经理与林业统计。电话:010--62888326Email :stang@
地
址:同上。
本刊网址:http :∥ ;http :∥
东北落叶松和南方马尾松地下生物量模型研建
曾伟生
唐守正
(中国林业科学研究院资源信息研究所)
摘要:在国家级森林资源监测中增加森林生物量估计已成为必然趋势,而地下生物量是森林生物量的重要组成部分。以东北落叶松和南方马尾松地下生物量数据为例,
对地下生物量模型的两种常用建模方案进行对比分析,指出了存在的弊端,并提出通过利用度量误差模型,建立相容性地上、地下生物量模型和根茎比模型的方法。结果表明:利用度量误差模型方法,能有效解决一套数据、两种结果的问题,确保各个模型估计结果的协调一致性和参数的稳健性;在地下生物量实测样本只是地上生物量实测样本的子样本时,合适的做法是利用子样本建立根茎比模型,再结合利用大样本建立的地上生物量模型来联合估计地下生物量;林木根茎比的大小主要与直径相关,并随林木直径的增大而逐渐增加。本文所建立的两个树种的地下生物量模型的预估精度,南方马尾松可达到90%以上,东北落叶松可达到85%以上,能用于大尺度范围的森林生物量估计。关键词:地下生物量;根茎比;度量误差模型;平均预估误差;落叶松;马尾松
中图分类号:S718.55+
6;S791.22;S791.248
文献标志码:A 文章编号:1000-
-1522(2011)02--0001--06ZENG Wei-sheng ;TANG Shou-zheng.Establishment of below-ground biomass equations for larch in northeastern and Masson pine in southern China.Journal of Beijing Forestry University (2011)33(2)1--6[Ch ,34ref.]Institute of Forest Resources Information ,Chinese Academy of Forestry ,Beijing ,100091,P.R.China.
It has become a trend to supplement national forest resources monitoring with forest biomass estimation.The below-ground biomass is an important component of forest biomass.Based on the below-ground biomass data of larch (Larix spp.)in northeastern China and that of Masson pine (Pinus massoniana )in southern China ,two approaches commonly used for modeling below-ground biomass ,i.e.,below-ground biomass and root-shoot ratio equations ,were compared ,and problems in modeling below-ground biomass were addressed.Then ,an approach to establish compatible above-and below-ground biomass equations and root-shoot ratio equation was proposed using the error-in-variable modeling method.The results show that :1)the new approach can be used to solve the problem of “one dataset ,two results ”,and the estimation results using different equations are consistent and stable ;2)in case of no enough sample trees to be selected for measurement of below-ground biomass ,a root-shoot ratio equation should be developed to estimate below-ground biomass with the aid of an above-ground biomass equation established through a large sample size ;3)the root-shoot ratio of an individual tree depends mainly on the diameter of the tree ,and increases gradually with the growing diameter.The prediction precisions of single-tree below-biomass equations developed in this study are >85%for larch in northeastern China and >90%for the Masson pine in southern China ,and can be applied for estimating forest biomass at a large scale.Key words
below-ground biomass ;root-shoot ratio ;error-in-variable model ;mean prediction error ;
larch ;Masson pine