Evaluation Of Water Conservation Function And Afforestation Design Of Typical Small Watershed In The Upper Reaches Of Daqing River

The Xiongan new area,is located in the key of the Daqing river basin.At present,the low forest coverage、unreasonable and inferior quality stand structures led to the water conservation function is poor.The excessive water consumption of trees also leads to the lack of water in the downstream production and living areas,the deterioration of the ecological environment,and the sharp contradiction between upstream and downstream water use.Therefore,to promote the ecological construction,it is of great significance to analyze the technical system of water conservation forest and afforestation in the upper reaches of Daqing river basin.At the same time,taking the typical small watershed in the upper mountain area of Daqing river as the research object,the present situation of forest water conservation function is evaluated.Under the background of the construction of ecological water-carrying small watershed,the typical design of water conservation forest.Thus:(1)The afforestation technology system of water conservation forest in the upper reaches of Daqing river basin was summarized from four aspects: design principle of water conservation forest,selection and collocation of tree species,forest planting mode,afforestation technology measures and afforestation density research.(2)The order of water conservation capacity of different forest stands in dalan watershed is Robinia pseudoacacia and Populus mixed forest>Populus pure forest>Robinia pseudoacacia pure forest>Pinus tabuliformis pure forest>Vitex negundo pure forest>Spiraea trilobata pure forest.(3)On the basis of the status quo of water conservation forests function evaluation,according to different site type,on the big blue small watershed 15 site type afforestation of typical design,ultimately determine the watershed should build mixed needle,needle forest is given priority to,put forward the five kinds of configuration mode,respectively,to close hillsides to facilitate afforestation mode,Platycladus orientalis+Vitex negundo mixed forest mode,Platycladus orientalis+Armeniaca sibirica mixed forest mode,Platycladus orientalis+Robinia pseudoacaci mixed forest mode and Pinus tabuliformis+Robinia pseudoacaci mixed forest mode.