Litterfall production modeling based on climatic variables and nutrient return from stands of Eucalyptus grandis Hill ex Maiden and Pinus taeda L.  

作　　者：Andrés Baietto Andrés Hirigoyen Jorge Hernández Amabelia del Pino 

机构地区：[1]Forest Department,Faculty of Agronomy,University of the Republic,12900 Montevideo,Uruguay [2]National Research Program of Forest Production,National Agriculture Research Institute,INIA,97000 Tacuarembó,Uruguay [3]Soil and Water Department,Faculty of Agronomy,University of the Republic,12900 Montevideo,Uruguay

出　　处：《Journal of Forestry Research》2024年第5期26-36,共11页林业研究（英文版）

基　　金：funded by Lumin S.A. and the Agencia Nacional de Investigación e Innovación (ANII)[POS_NAC_2016_1_130479]

摘　　要：Native grasslands in the Pampas of South America are increasingly being replaced by Eucalyptus and Pinus stands.The short rotation regimes used for the stands require high nutrient levels,with litterfall being a major source of nutrient return.To model the litterfall production using climatic variables and assess the nutrient return in 14-year-old Eucalyptus grandis and Pinus taeda stands,we measured litter production over 2 years,using conical litter traps,and monitored climatic variables.Mean temperature,accumulated precipitation,and mean maximum vapor pres-sure deficit at the seasonal level influenced litterfall produc-tion by E.grandis;seasonal accumulated precipitation and mean maximum temperature affected litterfall by P.taeda.The regression tree modeling based on these climatic vari-ables had great accuracy and predictive power for E.grandis(N=33;MAE(mean absolute error)=0.65;RMSE(root mean square error)=0.91;R^(2)=0.71)and P.taeda(N=108;MAE=1.50;RMSE=1.59;R^(2)=0.72).The nutrient return followed a similar pattern to litterfall deposition,as well as the order of importance of macronutrients(E.grandis:Ca>N>K>Mg>P;P.taeda:N>Ca>K>Mg>P)and micronutrients(E.grandis and P.taeda:Mn>Fe>Zn>Cu)in both species.This study constitutes a first approximation of factors that affect litterfall and nutrient return in these systems.

关 键 词：AFFORESTATION LITTERFALL Nutrient recycling Climate modeling MYRTACEAE PINACEAE 

分 类 号：S714[农业科学—林学]