Study On Water Conservation Function Of Different Afforestation Models

The relationship between forest and hydrology has always been a hot issue in academic research at home and abroad,forest hydrological effect refers to the impact on the forest nature and effect of water movement generated.Studying and analysis the influence of forest on the water circulation movement in earth is of great significance for the rational use of water resources,reducing the problem of water scarcity and the full play of the ecological benefits of forests in water circulation.From April to December,2014,author arranged according to work plan,Pingjiang County is selected as the key monitoring area in the Hunan Forest Restoration and Development Project Implementation Area,using field positioning monitoring method,taking three different afforestation models(M1:Coniferous species + General Broadleaf mixed forest mode1?M2:Coniferous species +Precious Broadleaf species mixed forest model,M3:Precious tree species model)in Pingjiang County as research objects,taking the barren mountain model(CK1)as a comparison,research on the overall system of three different models of forest water conservation by precipitation interception experiment,the following conclusions are drawn from data analysis:(1)According to the observation data of Pingjiang Meteorological Station in 2014,the spatial distribution of precipitation in the Pingjiang monitoring area during 2014 and during the monitoring period was significantly different.The rainfall in the 30-40mm precipitation interval was the largest,61.6mm,and the rainfall in the<10mm interval was the smallest,3.0mm.(2)The water holding capacity of the shrub layer is positively correlated with the biomass of the shrub layer,the water holding capacity of each forest stand shrub layer increased with the increase of rainfall before reaching the maximum water holding capacity.Under the condition of rainfall of 196.8mm,The difference in maximum water holding capacity of the shrub layer of each model stand during monitoring period is not significant,the maximum water holding capacity of each forest stand shrub layer is M3(0.502mm)>M2(0.491mm)>M1(0.490mm)according to the size.(3)Through the observation and data analysis of the litter interception of each stand,the maximum water holding capacity of the three afforestation modes was between 0.500 and 2.000 mm,and the maximum water holding capacity of the M3 litter layer was the largest,reaching 2.000mm.The maximum water holding capacity of each litter litter is M3(2.000mm)>M2(1.200mm)>M1(0.950mm).(4)By analyzing the physical properties of different forest stands,the water storage capacity of the three afforestation models was significantly different,among them,there is a big difference between M3 and M1 and M2,and there is little difference between M1 and M2.The maximum water storage capacity is precious broadleaf model(M3)(20.740mm),and the minimum is the general broadleaf model(M1)(16.170 mm).(5)According to analysis of water conservation capacity based on different hydrological processes in different forest stands,the total water source conservation capacity of each afforestation model was M3(992.042 mm)>M2(821.091 mm)>M1(792.621 mm).This paper analyzes the forest water conservation function of different afforestation models in Pingjiang,compares the water conservation functions of three afforestation models,and provides data support for sustainable development of each afforestation model.