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EFFECTS OF CINNAMOMUM CAMPHORA IN THE YANGTZE RIVER PROTECTION FOREST ON RAINFALL REDISTRIBUTION

Yun Fei Cao, Huang Zhigang

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Abstract

Rainfall redistribution of forest canopy is responsible for the transfer of rainfall from a tree cano- py to the soil and clearly influences the soil and water conservation in forest ecosystems.Therefore,re- search on rainfall redistribution is an important consideration from forest ecological and hydrological points of view.The partitioning of gross rainfall into throughfall,stemflow and interception in Cinnamomum cam- phora forest were observed at the ecological benefit monitoring station of the Yangtze River protection for- est in Cili County,Hunan Province,in order to assess the law of canopy hydrology.Rainfall depth had an impact on rainfall redistribution of C.camphora forest.Throughfall,interception and stemflow of C.cam- phora were positively correlated with rainfall depth (P0.05).As rainfall increased,throughfall percent- age of gross rainfall increased and interception percentage decreased.At higher rainfall depths,throughfall and interception percentage stabilized by degrees.However,stemflow percentage of gross rainfall showed an increasing trend initially and a decreasing trend with the increase of rainfall depth.Rainfall intensity also had an effect on rainfall redistribution.As rainfall intensity increased,throughfall percentage of gross rain- fall increased and interception percentage decreased.During the measurement period,throughfall,stemflow and interception of gross rainfall in C.camphora forest were 68.5%,2.3% and 29.2% respectively.Rain- fall redistribution of canopy in C.carnphora forest differed significantly among different rainfall depths and rainfall intensity ranges.Furthermore,the components of subcanopy rainfall (the ratio of stemflow and throughfall) were influenced by rainfall depth and rainfall intensity.At the same time,water input beneath the canopy had clearly spatial heterogeneity.Throughfall differed significantly among different sampling sites (P0.05) and the spatial variation in throughfall (i.e.,coefficient of variation of throughfall per- centage) decreased with the increase of rainfall depth and rainfall intensity.

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What this paper is about

Rainfall redistribution of forest canopy is responsible for the transfer of rainfall from a tree cano- py to the soil and clearly influences the soil and water conservation in forest ecosystems.Therefore,re- search on rainfall redistribution is an important consideration from forest ecological and hydrological points of view.The partitioning of gross rainfall into throughfall,stemflow and interception in Cinnamomum cam- phora forest were observed at the ecological benefit monitoring station of the Yangtze River protection for- est in Cili County,Hunan Province,in order to assess the law of canopy hydrology.Rainfall depth had an impact on rainfall redistribution of C.camphora forest.Throughfall,interception and stemflow of C.cam- phora were positively correlated with rainfall depth (P0.05).As rainfall increased,throughfall percent- age of gross rainfall increased and interception percentage decreased.At higher rainfall depths,throughfall and interception percentage stabilized by degrees.However,stemflow percentage of gross rainfall showed an increasing trend initially and a decreasing trend with the increase of rainfall depth.Rainfall intensity also had an effect on rainfall redistribution.As rainfall intensity increased,throughfall percentage of gross rain- fall increased and interception percentage decreased.During the measurement period,throughfall,stemflow and interception of gross rainfall in C.camphora forest were 68.5%,2.3% and 29.2% respectively.Rain- fall redistribution of canopy in C.carnphora forest differed significantly among different rainfall depths and rainfall intensity ranges.Furthermore,the components of subcanopy rainfall (the ratio of stemflow and throughfall) were influenced by rainfall depth and rainfall intensity.At the same time,water input beneath the canopy had clearly spatial heterogeneity.Throughfall differed significantly among different sampling sites (P0.05) and the spatial variation in throughfall (i.e.,coefficient of variation of throughfall per- centage) decreased with the increase of rainfall depth and rainfall intensity.

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Available abstract

Rainfall redistribution of forest canopy is responsible for the transfer of rainfall from a tree cano- py to the soil and clearly influences the soil and water conservation in forest ecosystems.Therefore,re- search on rainfall redistribution is an important consideration from forest ecological and hydrological points of view.The partitioning of gross rainfall into throughfall,stemflow and interception in Cinnamomum cam- phora forest were observed at the ecological benefit monitoring station of the Yangtze River protection for- est in Cili County,Hunan Province,in order to assess the law of canopy hydrology.Rainfall depth had an impact on rainfall redistribution of C.camphora forest.Throughfall,interception and stemflow of C.cam- phora were positively correlated with rainfall depth (P0.05).As rainfall increased,throughfall percent- age of gross rainfall increased and interception percentage decreased.At higher rainfall depths,throughfall and interception percentage stabilized by degrees.However,stemflow percentage of gross rainfall showed an increasing trend initially and a decreasing trend with the increase of rainfall depth.Rainfall intensity also had an effect on rainfall redistribution.As rainfall intensity increased,throughfall percentage of gross rain- fall increased and interception percentage decreased.During the measurement period,throughfall,stemflow and interception of gross rainfall in C.camphora forest were 68.5%,2.3% and 29.2% respectively.Rain- fall redistribution of canopy in C.carnphora forest differed significantly among different rainfall depths and rainfall intensity ranges.Furthermore,the components of subcanopy rainfall (the ratio of stemflow and throughfall) were influenced by rainfall depth and rainfall intensity.At the same time,water input beneath the canopy had clearly spatial heterogeneity.Throughfall differed significantly among different sampling sites (P0.05) and the spatial variation in throughfall (i.e.,coefficient of variation of throughfall per- centage) decreased with the increase of rainfall depth and rainfall intensity.

Key concepts: Throughfall, Stemflow, Interception, Environmental science, Canopy interception, Hydrology (agriculture), Canopy, Cinnamomum camphora

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EFFECTS OF CINNAMOMUM CAMPHORA IN THE YANGTZE RIVER PROTECTION FOREST ON RAINFALL REDISTRIBUTION — Research Paper | ScholarLens