Article(id=1242118380283559968, tenantId=1146029695717560320, journalId=1146031591421210625, issueId=1242118379335651657, articleNumber=null, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1219248000000, receivedDateStr=2008-08-21, revisedDate=-2209017600000, revisedDateStr=1900-01-01, acceptedDate=null, acceptedDateStr=null, onlineDate=1178726400000, onlineDateStr=2007-05-10, pubDate=1178726400000, pubDateStr=2007-05-10, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1178726400000, onlineIssueDateStr=2007-05-10, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1774073699300, creator=sys-migrate, updateTime=1774073699300, updator=sys-migrate, issue=Issue{id=1242118379335651657, tenantId=1146029695717560320, journalId=1146031591421210625, year='2007', volume='25', issue='0709', pageStart='1', pageEnd='75', issueExtLink='null', onlineDate='null', pubDate='1178726400000', pubDateStr='2007-05-10', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=3, issueType=-1, specialIssue=null, createTime=1774073699072, creator='sys-migrate', updateTime=1774073699072, updator='sys-migrate', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=40, endPage=46, ext={EN=ArticleExt(id=1242118382703673408, articleId=1242118380283559968, tenantId=1146029695717560320, journalId=1146031591421210625, language=EN, title=Study on the Influence of Plot Area Size on Estimation of Stand Density and Analysis of Patterns of Natural Forests, columnId=1242116080374710456, journalTitle=Science & Technology Review, columnName=Articles, runingTitle=null, highlight=null, articleAbstract=Data from 4 100 m×100 m natural forest plots were used to estimate tree number per hectare and basal area based on plot sizes, the difference between estimated and actual values was calculated. Then a uniform angle index and a pair-correlation function were used to analyze the spatial patterns of trees in forest plots with varying sizes. It is shown that both the spatial and non-spatial structure indices of forest are related to plot sizes. Both densities and patterns become stabilized with increasing plot sizes, indicating that stand densities and forest patterns should be estimated or analyzed with data from big enough plots. According to our study, 2 500 m2 is appropriate for either the estimation of stand densities or analysis of forest patterns., authors=null, authorsList=null, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=3TWfzYm5BmN8aIqJAdCdkA==, pdfFileSize=974491, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1242118382183579706, articleId=1242118380283559968, tenantId=1146029695717560320, journalId=1146031591421210625, language=CN, title=不同样地大小对天然林林分的密度估计和格局分析影响研究, columnId=1146540929516700224, journalTitle=科技导报, columnName=研究论文, runingTitle=null, highlight=null, articleAbstract=采用4块100 m×100 m的天然林样地材料，根据不同样地大小对应林木的株数和断面积来估算其每公顷株数和断面积，计算估计值与实际值的差异；并分别利用角尺度和双相关函数分析不同大小的样地对应林木个体的空间分布格局。结果表明，无论非空间结构指标还是空间结构指标都与样地大小有关。随着样地面积逐渐变大，所估计的每公顷密度和分析的林木空间分布格局均趋于稳定，这意味着林分的密度估计和结构分析必须在足够大的样地上进行。根据本研究资料，当样地面积为2 500 m2时，无论是对密度估计还是结构分析都是合适的。, authors=李丽¹,惠刚盈²,惠淑荣¹,徐海²,胡艳波²,林天喜³, authorsList=李丽;惠刚盈;惠淑荣;徐海;胡艳波;林天喜, authorCompany=1. 沈阳农业大学林学院 沈阳2. 中国林业科学研究院林业研究所 北京3. 吉林省蛟河林业实验区管理局 吉林蛟河, correspAuthors=null, authorNote=null, correspAuthorsNote=惠刚盈, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=gbwYe2cqupbsqb1AvEnH9g==, pdfFileSize=974491, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null)}, authors=null, keywords=[Keyword(id=1242118381625737261, tenantId=1146029695717560320, journalId=1146031591421210625, articleId=1242118380283559968, 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