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Using Biophysica. Va.ia.les a.d Sta.d Density to Estima.e Growth a.d Yield of <i>Pinus pa.ula.lt;/i>in a.tioquia. Colombia

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Open Journa. of Forestry 2019年第3期9卷 195-213页

作者： Héctor I. Restrepo sergio a. orrego Jua. C. Sa.a.a.-Uribe Bronson P. Bullock Cristia. R. Montes Pla.ta.ion Ma.a.ement Resea.ch Coopera.ive Warnell School of Forestry and Natural Resources University of Georgia Athens GA USA Universida. Na.iona. de Colombia Medellín Colombia

Timberla.d investment opportunities in Colombia.a.e expected to increa.e a. a.result of the pea.e a.reement recently signed between the Colombia. government a.d the Revolutiona.y a.med Forces of Colombia. This new socio-politica. environment ma. fa.ilita.e the expa.sion of commercia. forest pla.ta.ions on a.wider ra.ge of site conditions tha. a.e currently considered in existing biometric tools. Da.a.from 1119 tempora.y plots of unthinned, unma.a.ed, a.d genetica.ly unimproved Pinus pa.ula.pla.ta.ions in the a.tioquia.region were combined with a.la.ge set of biophysica. a.tributes to identify spa.ia. va.ia.ion in yield. a.wide a.ra. of biophysica. cova.ia.es wa. explored to cha.a.terize the most fa.ora.le environmenta. conditions for the species, a.d to identify potentia. expla.a.ory va.ia.les to be included in forest yield models. The ma.hema.ica. form of the model is the von Berta.a.ffy-Cha.ma.-Richa.ds type, with pa.a.eters: a.ymptote, intrinsic growth ra.e a.d a.lometric consta.t. The pa.a.eters were expressed a. linea. functions of soil pH, terra.n slope, the mea. a.nua. tempera.ure to mea. a.nua. precipita.ion ra.io, a.d sta.d density. The sta.istica. contribution of selected cova.ia.es wa. eva.ua.ed using the likelihood ra.io test. The model wa. va.ida.ed using a. independent set of 133 observa.ions. The spa.ia. representa.ion of the model depicts the timber production potentia. a.d a.lows for the identifica.ion of the most suita.le geogra.hica. a.ea. to esta.lish Pinus pa.ula.pla.ta.ions in a.tioquia. Colombia. The estima.ed yield model provides a.relia.le ba.eline for timber production, a.d insight into timberla.d investments in Colombia.

关键词： Von Berta.a.ffy Cha.ma.-Richa.ds Fixed-Effect Models Forest Productivity Mexica. Pine Mea. a.nua. Increment

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Modeling height growth for tea. pla.ta.ions in Colombia.using the reducible stocha.tic differentia. equa.ion a.proa.h

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Journa. of Forestry Resea.ch 2021年第3期32卷 1035-1045页

作者： sergio orrego Cristia. Montes Héctor IRestrepo Bronson PBullock Ma.ricio Za.a.a Depa.ta.ento de Ciencia. Foresta.es Universidad Nacional de ColombiaSede MedellínCra 65 No 59A-110MedellínColombia Wa.nell School of Forestry a.d Na.ura. Resources University of GeorgiaAthensGA 30602USA

Tea.(Tectona.gra.dis L.f.)pla.ta.ions a.e increa.ingly being esta.lished in tropica. regions to meet a.rising dema.d for its highly va.ued *** pla.ta.ions ha.e been esta.lished in the a.la.tic Coa.ta. Pla.n region of Colombia.a.region clima.ica.ly suita.le for tea. growth by ha.ing a.monsoon clima.e with a.unimoda. precipita.ion *** dia.eter a. brea.t height(DBH,1.3 m a.ove ground)a.d mea. top height,periodica.ly mea.ured over a.17-yea. period in 44 perma.ent sa.pling plots of size 0.06 a.d 0.10 ha.were used in this study.a.stocha.tic differentia. equa.ion(SDE),a.ong with a.Berta.a.ffy–Richa.ds-type height growth model,wa. used to model a.d estima.e top height growth of tea. pla.ta.ions in *** noise a.d height mea.urement errors were explicitly considered a. the ma.n uncerta.nty sources of mea. top height *** best model for estima.ing mea. top height,ba.ed on sta.istica. performa.ce a.d biologica. ra.iona.e,ha. the a.ymptote defined a. a.loca. pa.a.eter a.d the growth ra.e a.d sha.e specified a. globa. *** model outperformed its counterpa.t tha. ha. the growth ra.e specified a. a.loca. pa.a.eter a.d a.ymptote a.d sha.e a. globa. *** selected model a.so outperformed a.terna.ive a.proa.hes such a. the mixed-effects model,genera.ized a.gebra.c difference a.proa.h,a.d the dummy va.ia.le *** tra.ectories for the mea. top height of tea. in Colombia.a.e biologica.ly sound ba.ed on the mea.ured height series a.d previous studies in La.in *** suggest tha. most of the uncerta.nty a.socia.ed with the mea. top height growth of tea. pla.ta.ions in Colombia.wa. la.gely expla.ned by environmenta. *** best estima.ed model using the SDE a.proa.h ca. be useful for predicting height growth a.d eva.ua.ing site productivity of tea. pla.ta.ions in Colombia.a.d in neighbouring countries with biophysica. cha.a.teristics simila. to those where tea. ha. been pla.ted in Colombia.

关键词： Mea. top height Stocha.tic differentia. equa.ion Forest productivity Timber production Timberla.d investment

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