| Quercus acutissima belonging to Fagaceae deciduous trees is an important species of fuel forest in hilly area of our country, also is the important tree species in China in the future development of forestry biomass energy forest.Quercus acutissima mixed forest in improving soil physical and chemical properties, litter storage capacity, improving the average DBH higher forest tree has been investigated.Pinus massoniana Lamb and Quercus acutissima mixed forest have been rarely reported in the mixed proportion and site conditions.Pinus massoniana Lamb root developed taproot, obviously, a root fungus. Not strict to edaphic requirement,like microacidic soil, in scour thin stone soil, sandy soil, clay, and the sunny slope and ridge, a steep mountain rock crevices can grow.Pinus elliottii is the fast-growing evergreen trees, it is drought and hard, barren resistant, good adaptability and resilience, often as a scenic forest and soil and water conservation forestregion of low hill hill.Pinus taeda L general vertical distribution in the 500 meters below the low mountains, hills, hill afforestation.This test uses field survey and laboratory research unifies, acquisition of Masson Pine and Quercus acutissima mixed, slash pine, loblolly pine- Quercus acutissima mixed Quercus acutissima mixed and pure stands of Quercus acutissima 0-10 cm layer and 10-20 cm layer of soil, the difference of different slope aspect, slope and mixed type and mixed proportion about soil physical structure and nutrient elements, has important theoretical and practical significance to guide the ecological reconstruction.The main results are as follows:1.The south slope and North Slope compared:The southern slope of soil moisture is higher than that of the north slope of soil;The southern slope of soil hardness lower than the North Slope Soil;The 0-10 cm soil layer, soil nitrate nitrogen, soluble organic nitrogen, organic matter was lower than the northern slope of South Slope of soil; soil ammonium nitrogen, soil available phosphorus was higher than that of the North Slope2. Compared with different mixed types:Quercus acutissima mixed Pinus massoniana and lowest p H;Loblolly pine- Quercus acutissima mixed soil sand accounted for the largest proportion of grain size composition, the other is the largest proportion of powder particle;The content of soil nitrate and dissolved organic nitrogen in 0-10 cm soil layer of Quercus acutissima mixed Pinus massoniana maximum, and 0-10 cm layer to 10-20 cm soil of Pinus massoniana Quercus acutissima mixed variation amplitude of the most obviousâ—‹4The content of available phosphorus in soil 0-10 cm content below 10-20 cm soil layer3.Through the influence of slope gradient on soil physical and chemical properties of the determination, the results of the study show that: the soil hardness, soil bulk density and soil p H increased with slope gradient decreased and then increased and then decreased trend of.4.Through the pine- Quercus acutissima mixed in different proportions of soil parameters determination and analysis, results show that: control improved favorable mixed forest soil development mixed ratio between 1:2 to 1:7. |
