Study On Dynamic Soil Moisture And Effect Of Water And Soil Conservation Of Different Vegetation Configuration Types In Citurs Orchard

Hilly red soil region, which is located in the southeast of China, is one of regions with the highest Agricultural Productivity. Affected by uneven precipitation, the region have very serious seasonal drought.So soil water is of critical importance to maintain agroecosystem in the region. Studying temporal and spatial correlation of soil moisture in hilly red soil region, is not only useful for us to further understand the rule of temporal and spatial distribution of soil moisture and space-time dynamic rule, but also for the reasonable exploitation and utilization of water resources effectively, reduce soil and water loss has important reference meanings.Therefore this paper in Jiangxi province DeAn science institute of soil and water conservation and ecological science park citrus groves as the research object, the selection of plant grass, plow, open ladder net three orchards and LuoDe controlled zone, adopt standard district (5m*20m) in March2009to December2011every15day, according to a determination of0～100cm of the soil depth of six volume moisture content, in the same sample collection times of rainfall runoff area and road-related, combining science park meteorological data from weather stations, using the correlation analysis and cluster analysis, mathematical statistics analysis of soil water season change rule, soil moisture vertical change rule, configuration types minus flow and sediment reduction benefits, the main conclusions are as follows:(1) For the different configuration types soil moisture spatial and temporal variation characteristics of research shows that, in a normal year orchard soil moisture season can be divided into dynamic soil water stable (3～6month), soil water consumption period (the middle of June～mid August), soil moisture compensation)(mid August10～in mid-april) three stages. Soil moisture profile can is divided into SuBian layer (0to30cm), active layer (30to60cm), stable layer (60～100cm) and three levels. Different configuration types in dry and wet year in two years in type, the soil moisture of seasonal change trend have different features. Soil moisture content is low in drought year, in order to reduce the type; Soil moisture content is high in a wet year high, for wave type.60cm deep the orchard soil water is the most active surface of the border, the ground management effect on soil moisture in depth control0～60cm range.(2) the different configuration types orchard times change features rainfall runoff road-related research shows that the runoff and erosion change is consistent, the order of LuoDe> open net plow orchard> ladder orchard> plant grass orchard. And both significantly related, can use binary quadratic regression equation is y=0.3017x2-4.674x+13.624. R2=0.9851(a<0.05). No matter the rain type or interannual variability, of the combination of the grass planting grass orchard the optimal configuration, reduce flow and sediment reduction rate of85%or more.