基于非线性混合效应模型的泰山地区麻栎人工林地位指数表编制

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Developmentof a SiteIndex Table for Quercusacutissima Plantations in the Mount Tai Region Based on Nonlinear Mixed-Effects Models

ZHOU Guang-feng， XU Jia， ZHAO Jin-hong， WANG Yu-shan， ZHANG Qian* TaishanAcademyofForestrySciences，Tai'an271ooo，China

Abstract：Quercus acutissimaisanimportantafforestationandecological treespecies.Asoneof itsdistributionareas，the Mount Tai Region faces the pressing need to scientifically evaluate the site quality of its Q acutissimaplantations.This studyaimsto developa site index table for Q. acutissima plantations in the region，providing scientific support for site quality assessment and management practices of local Q acutissima forests.Taking Q .acutissima plantationsin theMount TaiRegionas theresearch object，this studyuses 232 sets of treeheight and agedata derived fromstem analysis of 30 average dominant tres.Based on fivecommon growth models，this studyadopts nonlinear mixed-effects models （NMEMs）with plot-levelrandomefects.Itdetermines thereferenceageaccording tothecoeficientofvariationof tree height across different age classes，compiles a site index table for Q acutissima plantations in the Mount Tai Region using the height relative dominance method，and evaluates theapplicability of the site index table by the X2 test and drop-point test.The results show that： （1） the site index table can be used to evaluate the site quality of Q .acutissima plantations in the Mount Tai Region.（2） the Chapman-Richards model is the optimal base model （R2=0.6575 ），which can serve as the guiding curve.（3））allNMEMsoutperform thebase models，with the NMEMwithrandom effcts appied to parametera achieving the best fitingperformance（ R2=0.9792 ，F ΔMSE=0.658Ω0 3）.（4） thereference age isdetermined as 40 years，with an index class interval of 1m and a total of 8 site index classes. （5） the X2 test and drop-point test confirm the practical applicabilityof the compiled site index table.In summary，the site index table of Q .acutissimaplantationsin the MountTai RegionbyNMEMs with plot-levelrandomefects，is suitablefor thesitequalityevaluationin theregion. Kavwnrde·Quovruc aouticcimg：Mount Tai Reainn：nonlinear mived_afferte mndel： cite malitv evaluatinn

森林立地质量决定着森林的生长与收获，对其准确评价是森林生产经营、生物量估算、林业研究等工作的基础[1-3]。（剩余12133字）