生物降解高分子缓控释材料与土壤微生物的互作关系

Interaction Between Biodegradable Polymer Slow-Controlled Release Materials and Soil Microorganisms

基于生物降解高分子材料的缓控释化肥的研究中,关于降解生物降解高分子缓控释材料的微生物的研究还很少.选取了三种不同的生物降解缓控释材料,包括含NPK的生物降解高分子缓释材料(PSRF)、保水剂聚(丙烯酸-co-丙烯酰胺)(SAP)、PSRF和SAP通过氢键相互作用形成的具有半互穿网络结构的保水生物降解高分子缓控释材料(SI-PSRF/SAP),对其降解微生物进行了群落结构分析,并对PSRF和降解RSRF微生物对土壤微生物的影响进行了研究.结果表明,三种材料都具有酰胺键,降解三种材料的微生物有相同部分,并且结构越相似,相同降解微生物越多;具有半互穿网络结构的保水生物降解高分子缓控释材料更有利于微生物Alpha多样性,从而更有利于土壤肥力;材料和菌悬液施入土壤都会提高微生物的数量,降低微生物的Alpha多样性.

In research of biodegradable polymer slow release fertilizers,there were few microbiological studies on microorganisms of biodegradable polymer slow release materials used in fertilizers.Three different biodegradable slow release materials were selected,namely,biodegradable polymer sustained release materials containing NPK(PSRF),water retaining agent(SAP),and water retention biodegradable polymer slow release material with semi-interpenetrating network structure(SI-PSRF/SAP).The community structure of degrading microorganisms was analyzed,and the interaction among PSRF,microorganisms that degraded RSRF and soil microorganisms was studied.The results show that the community components of the degrading microorganism are partially the same because of the amide group in common of the three degradable materials.Furthermore,the more similar the structure of materials are,the more the same degrading microorganisms will be.Water retention biodegradable polymer slow and controlled release material with semi-interpenetrating network structure is more conducive to the diversity of microbial Alpha and thus contributing to soil fertility.Both materials and bacterial suspension applied to soil can increase the number of microorganisms and decrease the Alpha diversity of microorganisms.