Functions and Benefits of Soil Conservation of Different Forest Types in Sand Mountain of Central South Shandong

The soil conservation function of six forest types were studied in soil and water conservation experiment station of Linqu.The results showed that the Robinia pseudoacacia Linn.stand controlled the biggest soil erosion amount of 43.22 t/hm2,followed by stand of Quercus acutissima Carr.,Acer mono Maxim.,and Pistacia chinensis Bunge with the amount of 41.85,39.74,38.39 t/hm2.The Pinus thunbergii Parl and Platycladus orientalis(Linn.)Franco stand controlled the smaller amount of 31.32,29.41 t/hm2.From the variance analysis of indexes,such as the amount of litter layer,total soil porosity,soil non-capillary porosity,soil organic matter content,soil infiltration rate,biomass of understory herbs,controlled amount of soil erosion,there were significant differences between different stands.The results showed that the soil conservation benefits of six different forest types decreased in the order of Robinia pseudoacacia Linn.,Quercus acutissima Carr.,Acer mono Maxim.,Pistacia chinensis Bunge,Pinus thunbergii Parl and Platycladus orientalis(Linn.)Franco.