The climate,mainly the water availability and temperature,drives the renewal of biomass inseasonal forest ecosystem,and the greenness and leaf area of its canopy are responsive climate variations.This study verified ...The climate,mainly the water availability and temperature,drives the renewal of biomass inseasonal forest ecosystem,and the greenness and leaf area of its canopy are responsive climate variations.This study verified models to explain the phenomenon of leaf production and deciduousness by time,with LAI（Leaf Area Index）,NDVI（Normalized Difference VegetationIndex）and climate variables,on period 2011-2016. The data were obtained in satellite images and in plots installed at forestmonitoring sites,visited monthly.The analysis incorporated the water balance.Three equations were compared,two alreadypublished and the equation that was adjusted in this work.The model was improved and validated with new variables and data.It is possible to estimate the fall and renew of leaves biomass in semideciduous forests with reasonable precision.展开更多
The dynamics of forest growth are related to the succession stage, the quality of the environment and the degree of anthropism. The growth of a forest is given by the activity of live trees, mortality, and trees that ...The dynamics of forest growth are related to the succession stage, the quality of the environment and the degree of anthropism. The growth of a forest is given by the activity of live trees, mortality, and trees that are cut or recruited during the growing period. A way of representing the growth dynamics of a forest is by the Transition Matrix, with the divisibility of the population in states, with probabilities of movement from one state to another, over time. Forest dynamics studies are carried out by means of a continuous forest inventory, allowing the calculation of gains and losses in basal area, mortality rates and ingrowth. In this study, the measurements were performed with a 5-year interval, on 27 plots distributed in 12 sites. The methodology correlated parameters of the forest dynamics with canopy, soil, relief and hydrographic parameters. An indicator of forest growth dynamics was proposed and it was tested. It was confirmed that the density factor interferes in growth dynamics of the forest.展开更多
The goal of this study is to evaluate the drift of litterfall from forest to adjacent areas, validate a method to estimate the drift with water balance, direction and speed of winds and quantify the nutrients of litte...The goal of this study is to evaluate the drift of litterfall from forest to adjacent areas, validate a method to estimate the drift with water balance, direction and speed of winds and quantify the nutrients of litterfall in nearby area of the forest patch as function of distance. This phenomenon can be considered an ecosystem service to improve soil quality of the agriculture crops around the forests by nutrient input coming from the litterfall. The experiment was installed in adjacent areas of the tropical forest at central region of the State of Minas Gerais, Brazil. The branches, reproductive material and leaves which fell were measured for three years into the forest and adjacents areas. The sampled nets were located on edge and equal distances from the edge. It＇s analyzed and estimated the contribution of the litterfall components to adjacent areas by air. The quantity of litterfall by distance had large variation between adjacent areas. And it was confirmed that model estimated the leaf drift by distance with good precision.展开更多
文摘The climate,mainly the water availability and temperature,drives the renewal of biomass inseasonal forest ecosystem,and the greenness and leaf area of its canopy are responsive climate variations.This study verified models to explain the phenomenon of leaf production and deciduousness by time,with LAI（Leaf Area Index）,NDVI（Normalized Difference VegetationIndex）and climate variables,on period 2011-2016. The data were obtained in satellite images and in plots installed at forestmonitoring sites,visited monthly.The analysis incorporated the water balance.Three equations were compared,two alreadypublished and the equation that was adjusted in this work.The model was improved and validated with new variables and data.It is possible to estimate the fall and renew of leaves biomass in semideciduous forests with reasonable precision.
文摘The dynamics of forest growth are related to the succession stage, the quality of the environment and the degree of anthropism. The growth of a forest is given by the activity of live trees, mortality, and trees that are cut or recruited during the growing period. A way of representing the growth dynamics of a forest is by the Transition Matrix, with the divisibility of the population in states, with probabilities of movement from one state to another, over time. Forest dynamics studies are carried out by means of a continuous forest inventory, allowing the calculation of gains and losses in basal area, mortality rates and ingrowth. In this study, the measurements were performed with a 5-year interval, on 27 plots distributed in 12 sites. The methodology correlated parameters of the forest dynamics with canopy, soil, relief and hydrographic parameters. An indicator of forest growth dynamics was proposed and it was tested. It was confirmed that the density factor interferes in growth dynamics of the forest.
文摘The goal of this study is to evaluate the drift of litterfall from forest to adjacent areas, validate a method to estimate the drift with water balance, direction and speed of winds and quantify the nutrients of litterfall in nearby area of the forest patch as function of distance. This phenomenon can be considered an ecosystem service to improve soil quality of the agriculture crops around the forests by nutrient input coming from the litterfall. The experiment was installed in adjacent areas of the tropical forest at central region of the State of Minas Gerais, Brazil. The branches, reproductive material and leaves which fell were measured for three years into the forest and adjacents areas. The sampled nets were located on edge and equal distances from the edge. It＇s analyzed and estimated the contribution of the litterfall components to adjacent areas by air. The quantity of litterfall by distance had large variation between adjacent areas. And it was confirmed that model estimated the leaf drift by distance with good precision.
