Response Of Decomposition And Nutrient Release Of Green Prickly Ash Harvest Residues To Microbial Inoculants And Exogenous Nitrogen Addition

Decomposition of litter is an important component of nutrient and carbon cycling in terrestrial ecosystems,affecting forest productivity and greenhouse gas emissions.Zanthoxylum bungeanum(Zanthoxylum armatum),as one of the main tree species for precision poverty alleviation,has been vigorously promoted and developed.It has great ecological value,economic value and social value.However,with the growing scale of the planting of green pepper,the amount of the harvested residue is increasing,but the main treatment way is to be burned or discarded in situ,resulting in environmental pollution and waste of resources.Compared with the incineration,composting can not only make the remainder of Zanthoxylum prickly as the organic manure,but also realize the recycling of nutrients,which is suitable for the sustainable development of the residue.In order to reveal the influence mode and mechanism of composting treatment on the decomposition and nutrient release of the harvested residue of Zanthoxylum Zanthoxylum,it provides a theoretical basis and data support to accelerate the decomposition and nutrient release of the residue.Therefore,this study took the remainder of Zanthoxylum as the research object.Through the composting treatment,the response of the remainder decomposition and nutrient release to the composting was studied.The study of different types of bacteria in the composting test(including: CK,YJ,ZZ and ZW)and C/N ratio(including 20,25,30 and 35)on the decomposition of the harvested residue and nutrient release of the harvest.The results show that:(1)In the composting experiment,the decomposition of residual leaves was the fastest,and the residue decomposition was slower,and the residual needling was the slowest.After the decomposition of 180 d,the residual leaf quality remains at 40.42%~65.2%,the residual mass remains at 70.8%~79.84%,and the residual mass residue rate is 82.7%~93.3%.(2)The addition of bacteria significantly promoted the decomposition of residues,especially the remaining leaves,among which EM bacteria solution(ZZ)was the best,plant and fermented EM bacteria(ZW)had the second effect,and the organic material starter(YJ)had the worst effect.The suitable C/N ratio is beneficial to the decomposition of the residue.Under the condition of different C/N ratio of the same bacteria,the residue of leaves,branches and thorns is the lowest,the time of decomposing 95% is the shortest,the residual rate of C/N20,C/N30 and C/N35 increases in turn,and the time of decomposition 95% is longer and longer.(3)Adding microbial inoculants can improve the nutrient content of the residue,among which EM bacteria(ZZ)is the best,plant and fermented EM bacteria(ZW)effect is the second,and organic material fermentative(YJ)is the worst.Generally speaking,the residual rate of nutrients added by microbial inoculants was less than CK,indicating that microbial agents promoted the release of nutrient elements.The residue rate of residues varied significantly with time.The ratio of microbial agents and C/N significantly affected the release of nutrient elements.The residual rate of residual nutrients obtained by adjusting C/N is C/N35>C/N30>C/N20>C/N25.(4)In composting test,10(EM bacteria +C/N25)residue was decomposed fastest,nutrient content was the highest,and nutrient release was the most significant.The time required for the residue decomposition of 50% and 95% is 0.49 a and 2.12 a.The time required for the residue decomposition of 50% and 95% is 1.15 a and 4.98 a,and the time required for the residue decomposition of 50% and 95% is 2.03 a and 8.76 a.To sum up,the suitable type of bacteria and the amount of exogenous nitrogen are important to promote the decomposition and nutrient release of the harvested residue of green pepper,and also be the key to increase the nutrient content of the residue.