2007-Comparison of point pattern e-fir stands in the north-east USA.pdfVIP

下载本文档

4
0
约4.64万字
约 13页
2017-04-11 发布于江苏
举报
版权申诉

2007-Comparison of point pattern e-fir stands in the north-east USA.pdf

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

2007-Comparison of point pattern e-fir stands in the north-east USA

? Institute of Chartered Foresters, 2007. All rights reserved. Forestry, Vol. 80, No. 3, 2007. doi:10.1093/forestry/cpm010 For Permissions, please email: journals.permissions@oxfordjournals.org Advance Access publication date 21 May 2007 Introduction Spatial pattern has important effects on a va- riety of physical and ecological processes in a forest stand including competition, size vari- ability and distribution, crown structure, growth and mortality (e.g. Kuuluvainen and Pukkala, 1987 ; Kenkel, 1988 ; Kenkel et al. , 1989 ; Miller and Weiner, 1989 ; Moeur, 1993 ; Rouvinen and Comparison of point pattern analysis methods for classifying the spatial distributions of spruce-fi r stands in the north-east USA FASHENG LI1 and LIANJUN ZHANG2* 1 Pfi zer, Inc. Eastern Point Road, Groton, CT 06340, USA 2 Faculty of Forest and Natural Resources Management, State University of New York, College of Environmental Science and Forestry, One Forestry Drive, Syracuse, NY 13210, USA *Corresponding author. E-mail: lizhang@esf.edu Summary The spatial distributions of tree locations in spruce-fi r forest stands in the north-east USA were explored by various methods of spatial point pattern analysis. The results indicated that the 13 nearest neighbour statistics were not reliable because of the assumption violations for independent distance measures and large sample size requirements. Three other methods (i.e. refi ned nearest neighbour functions, Ripley’s K-function and pair correlation function) seemed to capture the different aspects of the spatial patterns of these spruce-fi r stands. The edge effect correction was very important to obtain unbiased results for the spatial point pattern analysis. The toroidal edge correction proved to be simple and satisfactory in this study compared with other edge correction methods. The results indicated that 24 plots (48 per cent) were classifi ed as complete spatial random (CSR) point pattern, 17 (34 per cent) regular