微生物基覆盖材料对新垦滨海盐土理化性质的影响

微生物菌丝能够固结有机物物料形成的封闭覆盖物,实现对土壤的有效覆盖.[目的]微生物基覆盖材料的应用可降低海涂土壤蒸发、增强土壤水分入渗、促进土壤团粒结构形成和稳定,有利于减少表层土壤盐分累积,加速盐分洗脱.[方法]设置原始匡围滩涂处理(RCS,滩涂匡围完成后不进行人为处理)、常规处理(CVT,淡水洗盐+牛粪堆肥,牛粪堆...

Effect of Soil Amendment with Microbes on Physical and Chemical Properties ofReclaimedSaline Soil in Coastal Areas

【Background】Tidal flat is a natural ecological system with multiple functions for regulating coastal environments.Soil in most tidal flats in Chinais rich in sodium chloride but is poorly structured,short of organic matter and nutrients such as nitrogen and phosphorus,which undermine the ecological services the flats are expected to provide.Remediating tidal flats is therefore imperative to improve their functions,a key in which is to improve soil permeability and aggregation so as to facilitate salt leaching and plant growth.【Objective】The purpose of this paper is to elucidate the feasibility of using fungi hyphaeas a soil conditioner to improve soil quality and reduce water evaporation.【Method】We compared four remediating treatments:reclaiming the coastal soil only(RCS),conventional remediation coupled with freshwater washing and cattle manure application(CVT),CVT plus planting Sesbaniacannabina(SES),amending the soil with fungi hyphae(MCMs),MCMs plus planting Sesbaniacannabina(MCT).The efficacy of MCMs at improving physical and chemical properties of soil,as well as salt leaching and growth of the S.cannabina was measured and compared with other treatments.【Result】Compared to SES,MCMs significantly increasedthe biomass of S.cannabina(P<0.05)by 75.83%.Compared to RCS,MCT increased:①the field capacity of the 0~10cm soil by 25.23%;②bulk density of soil in 0~10,10~20 and 20~30cm layers by 9.52%,9.46%,8.67%,respectively;③water content in 0~10,10~20,20~30cm layers by 37.34%,36.17%and 19.67%,respectively;④the capillary porosity in 0~10,10~20,20~30cm layers by 14.55%,13.33%and 10.54%respectively;⑤the available P in 0~10,10~20,20~30cm layers by 160.52%,297.58%and 280.84%,respectively;⑥the available K in 0~10,10~20,20~30cmlayers by 186.25%,90.08%and 6.00%,respectively;⑦the organic matter content in 0~10,10~20 and 20~30cm layers by 505.88%,594.44%and 372.45%respectively;⑧the soluble salt content in 0~10,10~20,20~30cm layers by 87.25%,85.44%and 77.12%respectively.【Conclusion】MCT increased permeability of the surface soil to infiltrate precipitation and reduced the evaporation,thereby alleviating secondary salinization.Our results also showed that MCMs significantly increased the biomass of S.cannabina and soil nutrients,accelerating salt migration as a result.