| Due to the fast growth of eucalyptus plantation,short rotation period,intensive management,and the expansion of the eucalyptus afforestation area,eucalyptus plantation plant productivity has become increasingly serious,which lead to a severely limit of eucalyptus’ scale afforestation.Due to lack of the further research about ecological function of eucalyptus plantation cultivation measures,at present the cause of the eucalyptus even planted soil fertility decline and the control measures of soil fertility decline is not very clear,which cause the blindness of eucalyptus afforestation measures on production,and affects the eucalyptus plantation productivity to keep for a long time.So how to reveal the reasons and countermeasures of eucalyptus even planted soil fertility recession become urgent major issue in current forestry production.Because of this,this paper on the basis of studying the early stage of the tutor team,using group 201 1 design way of eucalyptus forest clearing different,different site preparation methods,parenting,different way of mixed forests,green manure interplanting mode,update methods such as positioning observation sample area,different managing methods on the growth of eucalyptus plantation,vegetation growth,soil fertility changes of dynamic measurement,research different managing methods on the long-term effects of eucalyptus plantation ecosystem,filter is suitable for the southern district of the application of can maintain long-term productivity of eucalyptus plantation management measures,provide theoretical guidance for the scientific management of eucalyptus plantation.The main research conclusion is as follows:(1)Different site preparation methods on eucalyptus plantation ecosystems have a quite different effects.Different soil preparation of eucalyptus plantation diameter at breast height,tree height growth difference reached significant level,den Ken diameter at breast height,tree height,volume growth was better than other means of site preparation,4 years of eucalyptus plantation diameter at breast height,respectively is 1.51 times that of the reclamation with Ken 1.11 times;With Ken to handle the undergrowth community composition is rich,undergrowth richness and community coverage,high diversity index;Different site preparation methods on eucalyptus forest land has a great influence on soil fertility,soil porosity condition characterized by Ken is superior to the other site preparation methods.Soil chemical properties are:total nitrogen,total phosphorus,total potassium and organic matter are shown with the deepness of soil deepen gradually become smaller,including total nitrogen,total phosphorus,organic matter content in soil nutrient content change significantly between the layers.PH increase gradually with the deepness of soil deepen.The overall situation,den Ken best processing of eucalyptus plantation.(2)Different site preparation methods on eucalyptus plantation ecosystems have a quite different effects.Different soil preparation of eucalyptus plantation diameter at breast height,tree height growth difference reached significant level,den Ken diameter at breast height,tree height,volume growth was better than other means of site preparation,4 years of eucalyptus plantation diameter at breast height,respectively is 1.5 1 times that of the reclamation with Ken 1.11 times;With Ken to handle the undergrowth community composition is rich,undergrowth richness and community coverage,high diversity index;Different site preparation methods on eucalyptus forest land has a great influence on soil fertility,soil porosity condition characterized by Ken is superior to the other site preparation methods.Soil chemical properties are:total nitrogen,total phosphorus,total potassium and organic matter are shown with the deepness of soil deepen gradually become smaller,including total nitrogen,total phosphorus,organic matter content in soil nutrient content change significantly between the layers.PH increase gradually with the deepness of soil deepen.The overall situation,den Ken best processing of eucalyptus plantation.(3)Different parenting has significant influence on tree plantation ecosystem.Different parenting diameter at breast height and tree height growth of eucalyptus plantation were significant differences,enlarge hole tending diameter at breast height,tree height,volume growth is better than other parenting.4 years of eucalyptus plantation diameter at breast height,respectively is 1.15 times that of block tending not raise].32 times;The differences under the different parenting eucalyptus forest vegetation development,enrich block tending the undergrowth of community composition.Undergrowth richness and community coverage,diversity index is higher;Different parenting eucalyptus forest soil fertility,there exist certain differences of soil pore condition characterized by massive cradle is better than other parenting.Soil chemical properties are:total nitrogen,total phosphorus,total potassium and organic matter are shown with the deepness of soil deepen gradually become smaller,including total nitrogen,total phosphorus,organic matter content in soil nutrient content change significantly between the layers.PH increase gradually with the deepness of soil deepen.The overall situation,block cradle and enlarge hole joint cradle is conducive to the accumulation of soil nutrients,including hole expanding joint best.(4)Sets of planting green manure has a positive effect on eucalyptus plantation ecosystem,different forest land by way of eucalyptus plantation growth exist significant differences.Set of seeding black mung bean by Indian cowpea mode diameter at breast height,tree height,volume growth is significantly better than any other set of sowing way,4 years of eucalyptus plantation diameter at breast height,respectively was 1.1 times of sowing lentils,not set by 1.5 times.Set of seeding black mung bean by Indian cowpea processing undergrowth community composition more rich,eucalyptus plantation ecosystem environment maintain effect is good,undergrowth richness and community coverage,high diversity index;Soil fertility status is set to broadcast black mung bean by Indian cowpea treatment is superior to the other set of sowing.Soil chemical properties are:total nitrogen,total phosphorus,total potassium and organic matter are shown with the deepness of soil deepen gradually become smaller,including total nitrogen,total phosphorus,organic matter content in soil nutrient content change significantly between the layers.PH increase gradually with the deepness of soil deepen.The overall situation,lentils and set replayed set of black mung bean by Indian cowpea the most beneficial to the accumulation of soil nutrients.(5)Different woodland update methods on eucalyptus plantation ecosystem has a certain influence.Different ways of cutting processing of eucalyptus plantation diameter at breast height,tree height growth difference reached significant level,cut pile of rotten processing of diameter at breast height,tree height,volume growth significantly superior to other updates,its 4 in plantation DBH were 1.44 times more likely to sprout regeneration artificial regeneration of 1.31 times.Cutting rush corrosion process of undergrowth community composition has more abundant,maintain the ecosystem environment effect is good,undergrowth richness and community coverage,high diversity index;Soil fertility conditions characterized by cutting rush corrosion treatment is better than that of other updates.Soil chemical properties are:total nitrogen,total phosphorus,total potassium and organic matter are shown with the deepness of soil deepen gradually become smaller,including total nitrogen,total phosphorus,organic matter content in soil nutrient content change significantly between the layers.PH increase gradually with the deepness of soil deepen.The overall situation,cutting rush corrosion of soil nutrient accumulation effect is best.(6)Mixed way has a significant effect on eucalyptus plantation ecosystem.Different ways of mixing the diameter at breast height,tree height growth of eucalyptus plantation,eucalyptus by acacia diameter at breast height,tree height,volume growth is obviously better than the other mixed methods,4 years of eucalyptus plantation diameter at breast height,respectively was 1.08 times of eucalyptus by nanyang jacaranda,eucalyptus 1.66 times of pure forest.Eucalyptus and nanyang jacaranda mixed forest vegetation community composition is richer,undergrowth richness and community coverage,high diversity index;Eucalyptus(acacia processing way of soil fertility is superior to other mixed.Soil chemical properties are:total nitrogen,total phosphorus,total potassium and organic matter are shown with the deepness of soil deepen gradually become smaller,including total nitrogen,total phosphorus,organic matter content in soil nutrient content change significantly between the layers.PH increase gradually with the deepness of soil deepen.The overall situation,eucalyptus x acacia on soil nutrient accumulation effect is best. |
