Brief analysis on canopy interception effect and influencing factors of five forest types in Simian Mountain of Chongqing

【Objective】 The study was to probe into the primary and secondary relation of factors influencing canopy interception of different forest types in Three Gorge Reservoir Region of Yangtze River.【Method】 Related data of 25 rainfalls from May to September in 2009 were observed.The paper made a grey correlation analysis on the research of factors influencing canopy interception among five forest type in Simian Mountain of Chongqing.【Result】 ①According to the general interception ratios from high to low,the five forest types are arranged as warm needle-leaved forest(42.70%)temperate needle-leaved forest(39.35%)broadleaf-conifer mixed forest(39.05%)evergreen and deciduous broad-leaved mixed forest(36.28%)evergreen broad-leaved forest(27.73%);According to the average interception ratios from high to low,the five types of forests are arranged as warm needle-leaved forest(50.08%)broadleaf-conifer mixed forest(44.91%)temperate needle-leaved forest(44.18%)evergreen and deciduous broad-leaved mixed forest(42.13%)evergreen broad-leaved forest(31.33%).②The influencing priority of meteorological factors for temperate needle-leaved forest is precipitationrainfall intensitywind velocitytemperatureair humidity.For broadleaf-conifer mixed forest,the priority is precipitationwind velocityrainfall intensitytemperature air humidity.For evergreen broad-leaved forest,the priority is precipitation=rainfall intensitywind velocity=temperatureair humidity.For evergreen and deciduous broad-leaved mixed forest,the priority is precipitationrainfall intensitywind velocitytemperatureair humidity.And for warm needle-leaved forest,the priority is precipitationrainfall intensitywind velocitytemperatureair humidity.③Between the canopy interception amount of each forest types and precipitation,a power function is shown.The precipitation of temperate needle-leaved forest,broadleaf-conifer mixed forest,evergreen broad-leaved forest,evergreen and deciduous broad-leaved mixed forest,warm needle-leaved forest standard land when reaching the saturated canopy interception is 102.4 mm(temperate needle-leaved forest),55.4 mm(broadleaf-conifer mixed forest),52.2 mm(evergreen broad-leaved forest),101.4 mm(evergreen and deciduous broad-leaved mixed forest) and 102.4 mm(warm needle-leaved forest).【Conclusion】 Different forest types have different canopy interception capabilities.The priority of canopy interception capability of different forest types is warm needle-leaved foresttemperate needle-leaved forestbroadleaf-conifer mixed forestevergreen and deciduous broad-leaved mixed forestevergreen broad-leaved forest.