Study On Microclimate Characteristics And Hydrological Characteristics Of Different Plantations In Wanchuan Ecological Park

In this study,we select four typical types of plantations under the same site conditions,referring to agricultural land in Wanchuan Agriculture Ecological Garden(hereinafter referred to as eco-park), and monitor the changings of temperature and relative humidity of the interior forest for one year to study the differences between different forest types; and analysis litters and soil hydrological characteristics of five plots to research difference between different woodland types, the primary conclusion as follows:The monthly mean temperture variation of the five types are similar to U curve,and the trend of monthly average relative humidity is more complex; compared with agricultural land, the four plantations' temperature and relative humidity's daily rang has a apparently decline. The temperature of Jul or Aug are the highest,the lowest was no evident.Compared among themselves,the order of the annul daily mean rang temperature is pear forest> camphor forest> hackberry forest > mixed forest(magnolia grandiflora forest+prunus cerasifera forest); and the order of the relative humidity dily range is: pear forest> hackberry forest > camphor forest> mixed forest.Conclusion of four forest plantations types' hydrological features of litter shows that litters biomass and thickness of the mixed forest are the biggest, other three forest plantations have no significant differences;of four types of forest stand,the litters biomass and thickness of un-decomposed litters are more than semi-decomposed litters;compared to the maximum water-holding content of un-decomposed litters and semi-decomposed, the mixed forest is the largest;the order of the maximum water content of the un-decomposed litters is :the mixed forest > hackberry forest>camphor forest>pear forest, and the order of semi-decomposed litters is the mixed forest > hackberry forest > pear forest > camphor forest.The order of five kinds of average soil bulk density is :farmland>camphor forest> pear forest >hackberry forest>mixed forest; soil total porosity and capillary porosity have decreased with soil depth deepening; In 0-60 cm soil layer of five kinds of plots,the order of capillary porosity is mixed forest>farmland; within five kinds of plots,soil total nitrogen, total phosphorus and organic of four vegetations are higher than farmland; the order of the average soil total porosity of four vegetations is :mixed forest > pear forest> hackberry forest>camphora forest > farmland; the largest soil water-holding capacity of five plots have decreased with soil depth increasing, effective water-holding capacity of non capillary porosity have the same trend; soil moisture infiltration of five types of plots have reached a steady state within 35 minutes;in 0-60 cm soil layers,the order of the mean of soil initial infiltration rate is:mixed forest> pear forest>hackberry forest>camphora forest>farmland;the order of average infiltration rate of five kinds of plots is:mixed forest > camphor forest > pear forest > hackberry forest> farmland. The five kinds of the soil infiltration model are simulated, which showed the Horton model is perfect for soil infiltration.