[Experience model for self-thinning process of even-aged pure stands].
Identifieur interne : 004073 ( Main/Corpus ); précédent : 004072; suivant : 004074[Experience model for self-thinning process of even-aged pure stands].
Auteurs : Chengzhen Wu ; Wei Hong ; Shujun YanSource :
- Ying yong sheng tai xue bao = The journal of applied ecology [ 1001-9332 ] ; 2005.
English descriptors
- KwdEn :
- MESH :
- growth & development : Pinus, Populus, Trees.
- Algorithms, Cunninghamia, Ecosystem, Models, Theoretical.
Abstract
Based on the famous -3/2 power rule and generalized Schumacher growth equation, a mathematical model for the density change of even-aged pure stands with time during self-thinning process was presented, and the genetic algorithms was used to fit this nonlinear model. With the collected data from Populus tremula var. davidiana, Pinus yunnanensis and Cunninghamia lanceolata even-aged pure stands, the new model was verified and compared with other models. The results showed that the new model could fit observed data very well, and was very useful in practice. The surplus square, mean relative error, mean absolute error and surplus standard deviation of the new model were all smaller than those of other models, indicating its good qualification in describing stand density change during self-thinning process and its useness in studying forest self-thinning rules. The study also showed that genetic algorithms could give a better global convergence, and be used to estimate the parameters of nonlinear models in ecology, biology and forestry.
PubMed: 15852914
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pubmed:15852914Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">[Experience model for self-thinning process of even-aged pure stands].</title><author><name sortKey="Wu, Chengzhen" sort="Wu, Chengzhen" uniqKey="Wu C" first="Chengzhen" last="Wu">Chengzhen Wu</name><affiliation><nlm:affiliation>Fujian Agriculture and Forestry University, Fuzhou 350002, China. fjwcz@126.com</nlm:affiliation></affiliation></author><author><name sortKey="Hong, Wei" sort="Hong, Wei" uniqKey="Hong W" first="Wei" last="Hong">Wei Hong</name></author><author><name sortKey="Yan, Shujun" sort="Yan, Shujun" uniqKey="Yan S" first="Shujun" last="Yan">Shujun Yan</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2005">2005</date><idno type="RBID">pubmed:15852914</idno><idno type="pmid">15852914</idno><idno type="wicri:Area/Main/Corpus">004073</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Corpus" wicri:corpus="PubMed">004073</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">[Experience model for self-thinning process of even-aged pure stands].</title><author><name sortKey="Wu, Chengzhen" sort="Wu, Chengzhen" uniqKey="Wu C" first="Chengzhen" last="Wu">Chengzhen Wu</name><affiliation><nlm:affiliation>Fujian Agriculture and Forestry University, Fuzhou 350002, China. fjwcz@126.com</nlm:affiliation></affiliation></author><author><name sortKey="Hong, Wei" sort="Hong, Wei" uniqKey="Hong W" first="Wei" last="Hong">Wei Hong</name></author><author><name sortKey="Yan, Shujun" sort="Yan, Shujun" uniqKey="Yan S" first="Shujun" last="Yan">Shujun Yan</name></author></analytic><series><title level="j">Ying yong sheng tai xue bao = The journal of applied ecology</title><idno type="ISSN">1001-9332</idno><imprint><date when="2005" type="published">2005</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Algorithms (MeSH)</term><term>Cunninghamia (MeSH)</term><term>Ecosystem (MeSH)</term><term>Models, Theoretical (MeSH)</term><term>Pinus (growth & development)</term><term>Populus (growth & development)</term><term>Trees (growth & development)</term></keywords><keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Pinus</term><term>Populus</term><term>Trees</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Algorithms</term><term>Cunninghamia</term><term>Ecosystem</term><term>Models, Theoretical</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Based on the famous -3/2 power rule and generalized Schumacher growth equation, a mathematical model for the density change of even-aged pure stands with time during self-thinning process was presented, and the genetic algorithms was used to fit this nonlinear model. With the collected data from Populus tremula var. davidiana, Pinus yunnanensis and Cunninghamia lanceolata even-aged pure stands, the new model was verified and compared with other models. The results showed that the new model could fit observed data very well, and was very useful in practice. The surplus square, mean relative error, mean absolute error and surplus standard deviation of the new model were all smaller than those of other models, indicating its good qualification in describing stand density change during self-thinning process and its useness in studying forest self-thinning rules. The study also showed that genetic algorithms could give a better global convergence, and be used to estimate the parameters of nonlinear models in ecology, biology and forestry.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">15852914</PMID><DateCompleted><Year>2006</Year><Month>06</Month><Day>20</Day></DateCompleted><DateRevised><Year>2016</Year><Month>10</Month><Day>18</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">1001-9332</ISSN><JournalIssue CitedMedium="Print"><Volume>16</Volume><Issue>2</Issue><PubDate><Year>2005</Year><Month>Feb</Month></PubDate></JournalIssue><Title>Ying yong sheng tai xue bao = The journal of applied ecology</Title><ISOAbbreviation>Ying Yong Sheng Tai Xue Bao</ISOAbbreviation></Journal><ArticleTitle>[Experience model for self-thinning process of even-aged pure stands].</ArticleTitle><Pagination><MedlinePgn>233-7</MedlinePgn></Pagination><Abstract><AbstractText>Based on the famous -3/2 power rule and generalized Schumacher growth equation, a mathematical model for the density change of even-aged pure stands with time during self-thinning process was presented, and the genetic algorithms was used to fit this nonlinear model. With the collected data from Populus tremula var. davidiana, Pinus yunnanensis and Cunninghamia lanceolata even-aged pure stands, the new model was verified and compared with other models. The results showed that the new model could fit observed data very well, and was very useful in practice. The surplus square, mean relative error, mean absolute error and surplus standard deviation of the new model were all smaller than those of other models, indicating its good qualification in describing stand density change during self-thinning process and its useness in studying forest self-thinning rules. The study also showed that genetic algorithms could give a better global convergence, and be used to estimate the parameters of nonlinear models in ecology, biology and forestry.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Wu</LastName><ForeName>Chengzhen</ForeName><Initials>C</Initials><AffiliationInfo><Affiliation>Fujian Agriculture and Forestry University, Fuzhou 350002, China. fjwcz@126.com</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Hong</LastName><ForeName>Wei</ForeName><Initials>W</Initials></Author><Author ValidYN="Y"><LastName>Yan</LastName><ForeName>Shujun</ForeName><Initials>S</Initials></Author></AuthorList><Language>chi</Language><PublicationTypeList><PublicationType UI="D004740">English Abstract</PublicationType><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>China</Country><MedlineTA>Ying Yong Sheng Tai Xue Bao</MedlineTA><NlmUniqueID>9425159</NlmUniqueID><ISSNLinking>1001-9332</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D000465" MajorTopicYN="N">Algorithms</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D032486" MajorTopicYN="N">Cunninghamia</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D017753" MajorTopicYN="Y">Ecosystem</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D008962" MajorTopicYN="Y">Models, Theoretical</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D028223" MajorTopicYN="N">Pinus</DescriptorName><QualifierName UI="Q000254" MajorTopicYN="N">growth & development</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D032107" MajorTopicYN="N">Populus</DescriptorName><QualifierName UI="Q000254" MajorTopicYN="N">growth & development</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D014197" MajorTopicYN="N">Trees</DescriptorName><QualifierName UI="Q000254" MajorTopicYN="Y">growth & development</QualifierName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>2005</Year><Month>4</Month><Day>28</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2006</Year><Month>6</Month><Day>21</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2005</Year><Month>4</Month><Day>28</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">15852914</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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