Effects Of Straw And Biochar Applied To Reductive Soil Disinfestation Of The Properties Of Latosol Soil And Greenhouse Gas Emissions

Reductive soil disinfestation(RSD)used on biodegradable soils is very promising.However,during the process of RSD,a large amount of organic material was added causing the soil structure and properties change.Changes in soil properties may lead to changes in soil greenhouse gas emissions.Biochar is made of straw and other biological materials from the carbonization,it has good improvement effect for the restoration of degraded soil.In recent years,due to continuous application of a large number of agricultural chemicals,Hainan soil degradation is serious,especially biological degradation.Hoever,that are ess reported on soil properties and greenhouse gas emissions in RSD process and RSD treatmen with using the straw,biochar as a materials.In this paper,the effects of RSD process and treatment on soil properties and greenhouse gas emissions were studied by laboratory experiment.Six straw(rice straw,bagasse,corn straw,peanut straw,soybean straw,stlosanthes straw),6 kinds of biochar(rice biochar,bagasse biochar,Corn biochar,peanut biochar,soybean biochar,stlosanthes biochar)and 6 kinds of straw + stlosanthes and CK(without straw and biochar)were used in the experiment.The experiment have 19 treatments.The results are as follows1,straw,straw + biochar and biochar used in RSD organic materials,only straw and straw + biochar mixture can quickly create a strong reduction conditions,biochar can not form a strong soil to restore the environment.2,RSD process,straws and straw + biochars can significantly improve soil pH and organic carbon content,reduce soil available phosphorus content.In addition to bagasse and bagasse + bagasse biochar can not significantly improve the content of available potassium,the other treatment can improve the available potassium content.3,RSD process,straws can significantly improve CO2 emissions.In addition to rice straw,other straws can significantly reduce soil N2O emissions.Bagasse treatment of soil CH4 emissions and CK no difference,other straw is greatly promoted CH4 emissions.The order of global warming potential of straw treatments were consistent with the order of CH4 emission,which was peanut straw>stlosanthes straw>corn straw>rice straw>soybean straw>CK>bagasse.4,RSD process,straw + biochars significantly increased soil CO2 emissions,but CH4 emissions and CK was not significant.In addition to mixed rice and mixed plants,other mixing treatments can significantly reduce soil N2O emission,and the N2O emission of mixed soils is not different from CK.The global warming potential of the mixed treatment is also no different from CK.5,RSD treatment of soil,straw(except rice straw)can significantly improve soil N2O emissions.Straw also contributes to soil CO2 emissions,but no CH4 emissions.The global warming potential of straw treatments were significantly higher than that of CK.6,RSD treatment of soil,bagasse mixture and soybean mixture can significantly increase the soil N2O cumulative emissions,other mixed treatment of soil N2O cumulative emissions and CK no difference.The mixed treatment(soybean mixture)can not significantly improve the soil CO2 emissions,can not significantly improve the soil CH4 emissions.In addition to the mixture of bagasse and soybean,the global warming potential of each mixed treatment was not significantly different from CK.7,in view of the biochar can not form a strong reduction of the soil environment,so the biochar can not be used alone in the RSD method.Because the global warming potential of straw + biochar in RSD process is lower than that of straw alone,the global warming potential after RSD treatment is still low in straw and straw biomass,it is suggested that in RSD,application of straw + biochar instead of straw alon.