Based On The Soil Seed Bank Study Artificial Promotion Degraded Land Vegetation Restoration And Reconstruction Technology

Nandawa sandy wasteland was located in northern Hebei paddock County, andLocated in the northern arid and semi-arid areas. Since long-term, due to human irrationalproduction activities, dry and windy weather conditions as well as the place of fragileecosystems, desertification was serious. Drought, poor soil, Lack of seed bank and so onfactors had limited the region sandy wasteland vegetation recovery. Qian’an city waslocated in the eastern part of Hebei Province, iron reserves was large, known as "steelQian’an", with the iron ore mining, iron ore tailings piling up, causing seriousenvironmental problems, revegetation was difficult. Therefore, Nandawa sandy wastelandand Qianan iron tailings become research Natural vegetation restoration and reconstructionof the two typical degraded land. This article in the Nandawa sandy wasteland set newsoil(the form of overlying soil to donation Soil seed Banks), new soil plus aquasorb, sandywasteland dibble seeds, sandy wasteland dibble seeds plus aquasorb and sandy wastelandcontrol area5kinds processing. Through using degraded wasteland’s soil seed bank andartificial supplementary source way, analysis different soil treatment measures that play onthe degraded sandy wasteland soil and vegetation restoration a role. Study on the recoveryof near natural vegetation based on soil seed bank.Meanwhile, based on the technology,and select Vegetation recovery more difficult Qian’an iron tailings as potting soil matrix,setting12different treatment pot experiment in the school, sow four kinds of plant seedssuch as Pinus tabulaeformis, mongolica, alfalfa, and amorpha, in a separate pot tosimulated soil seed bank, investigated soil characteristics and vegetation characteristics,and analysis the different improved measures play a role in the process of the soil andvegetation restoration, draw the following conclusions:（1）The number of seed bank species kinds of provenances> sandy wasteland, weredominated in perennial herbaceous plants, and dicotyledons were in the majority, no treesand shrubs seeds were found. The seed density is provenances> sandy wasteland.（2）The different improvement measures herbaceous ɑ species diversity showed:1）Margalef richness index, new soil plus water retention agent land> new soil>sandywasteland.2）Pielou evenness index, there were no difference between new soil and newsoil plus water retention agent land, but were higher than that of sandy wasteland.3）Simpson diversity index, the new soil plus water retention agent land to be the largest, followed by new soil, and finally the sandy wasteland.4）Shannon-Wiener diversity index,new soil plus water retention agent land> new soil>sandy wasteland.（3）New soil and new soil plus water retention agent plots biomass, whether on theearth part or the underground section to be far higher than the biomass of sandy wasteland,new soil biomass (937.80g/m~2) was3.27times of the the sandy wasteland biomass (287.11g/m~2). Viewing from the shoot ratio: sandy wasteland to1.85>new soil to1.69> new soilplus water retention agent to1.04.（4） Soil organic matter, total nitrogen, total phosphorus, total potassium,alkali-hydrolyzable nitrogen, available phosphorus, available potassium change weresubstantially the same trend, performance for: in the0-10cm soil layer，3kinds of availablenutrient were new soil plus water retention agent﹥New soil﹥sandy wasteland (ck), whilein10-20cm,20-40cm soil layer, three plots available nutrients was no significantdifference.（5）The physical properties of pot experiment: iron tailings, iron tailings+100kg/hm~2N,50kg/hm~2P,50kg/hm~2K of inorganic fertilizer and iron tailings+200kg/hm~2N,100kg/hm~2P,100kg/hm~2K of inorganic fertilizer bulk density had little difference. Inthe mixed soil handling, iron tailings+25%of soil> iron tailings+50%of soil>iron tailings+75%of soil>100%of soil. in The pig manure handling, iron ore tailings+1%of pigmanure> iron tailings+5%of pig manure>iron tailings+10%of pig manure, with theincreasing of the amount of pig manure fertilizer, iron ore tailings bulk density slightlyreduced. iron tailings, iron tailings+100kg/hm~2N,50kg/hm~2P,50kg/hm~2K of threekinds of inorganic fertilizer treatment water holding capacity had little difference.100%ofsoil>iron tailings+75%of soil>iron tailings+50%of soil>iron tailings+25%of soil, thegreater the amount of mixed soil had the greater impact on the water holding capacity. Irontailings+10%of pig manure>iron tailings+5%of pig manure>iron ore tailings+1%of pigmanure, Increasing the amount of organic fertilizer would help improve the water holdingcapacity of iron ore tailings.（6）The conductivity of inorganic fertilizer treatment iron tailings+200kg/hm~2N,100kg/hm~2P,100kg/hm~2K of inorganic fertilizer (ck)＞iron tailings+100kg/hm~2N,50kg/hm~2P,50kg/hm~2K of inorganic fertilizer＞iron tailings; conductivity of new soiltreatment were100%of soil＞the iron tailings+75%of soil＞iron tailings+50%of soil＞iron tailings+25%of soil; conductivity of the pig manure were iron tailings+10%of pigmanure＞the iron tailings+5%of pig manure＞iron ore tailings+1%of pig manure.（7）Cation exchange capacity iron tailings, iron tailings+100kg/hm~2N,50kg/hm~2P,50kg/hm~2K of inorganic fertilizer and iron tailings+200kg/hm~2N,100kg/hm~2P,100kg/hm~2K of inorganic fertilizer had little difference. With the increase of the proportion ofmixed soil, ores cation exchange capacity gradually increase, performance for:100%ofsoil＞iron tailings+75%of soil＞iron tailings+50%of soil＞iron tailings+25%of soil. Pig manure for the improvement of the ores cation exchange capacity were poor, iron oretailings+1%of pig manure, iron tailings+5%of pig manure, iron tailings+10%of pigmanure and iron tailings+5%of pig manure and100kg/hm~2N, the50kg/hm~2P,50kg/hm~2K of inorganic fertilizer four processing cation exchange capacity was at a lowerlevel.（8）The alfalfa and Amorpha the chlorophyll content, In the inorganic fertilizertreatment, chlorophyll content iron tailings+200kg/hm~2N,100kg/hm~2P,100kg/hm~2Kof inorganic fertilizer＞iron tailings+100kg/hm~2N,50kg/hm~2P,50kg/hm~2K of inorganicfertilizer＞iron tailings+200kg/hm~2N,100kg/hm~2P,100kg/hm~2K of inorganic fertilizer.With the increase of the proportion of new soil, two plants chlorophyll content were alsoincreasing. In the100%of soil treatment, chlorophyll content were all reached themaximum. Organic fertilizer treatment also have a certain impact on plant chlorophyllcontent.（9）The alfalfa and Amorpha the protein content were increased with the increasingof inorganic fertilizer, the proportion of mixed soil and the proportion of manureapplication, Mixed soil had the greatest impact on the two plant protein contentcontent,The alfalfa in the iron tailings+25%soil+inorganic fertilizer (100kg/hm~2N,50kg/hm~2P,50kg/hm~2K) process reaches a maximum (5.59%), Amorpha process in the100%of soil treatment reaches a maximum (4.83%).（10）Pinus tabulaeformis, mongolica, alfalfa, and amorpha biomass were increasedwith the increasing of inorganic fertilizer, the proportion of mixed soil. Pinus tabulaeformis,mongolica and amorpha process in the100%of soil treatment reaches a maximum,respectively12.11g and14.62g. Amorpha process in the iron tailings+5%of pig manuretreatment reaches a maximum (12.89g).(11) Growing on the bare tailings Pinus tabulaeformis, mongolica and alfalfa shootratio were lower, respectively0.301,0.300,0.326, Amorpha shoot ratio relatively high0.972; in100%of soil treatment, four kinds of plant shoot ratio were all reached themaximum (0.918,0.911,0.989,1.780).