生物质炭对荠菜生长过程中根区土壤特性和微生物特性的影响

发布时间：2018-04-04 16:19

本文选题：生物质炭　切入点：荠菜　出处：《江苏农业科学》2017年16期

【摘要】：利用控制性的大田试验栽培技术,研究不同浓度生物质炭[对照(CK,0)、低生物质炭(LB,10 t/hm2)、中生物质炭(MB,20 t/hm2)、高生物质炭(HB,30 t/hm2)]对荠菜生长过程中根区土壤特性和微生物特性的影响。结果表明:荠菜根区土壤p H值、容重和全盐含量随生物质炭浓度的增加呈逐渐降低趋势,不同浓度生物质炭处理下的荠菜根区土壤p H值、容重和全盐含量均显著低于对照(P0.05)。荠菜根区土壤养分和植株养分含量均随生物质炭浓度的增加呈先增加后降低的趋势,MB浓度处理下,荠菜根区土壤养分和植株养分含量达到最大,不同浓度生物质炭处理下的荠菜土壤养分和植株养分含量均显著高于对照(P0.05)。荠菜根区土壤微生物数量以细菌最多(占微生物总数的90%以上),其次是放线菌,真菌最少,荠菜根区土壤细菌数量和放线菌数量随生物质炭浓度的增加呈先增加后降低的趋势,MB浓度处理下,荠菜根区土壤细菌数量和放线菌数量最大且显著高于对照,而生物质炭却显著降低了荠菜根区土壤真菌数量,但总的来说,生物质炭显著增加了荠菜根区土壤微生物总数。荠菜根区土壤酶活性和微生物量均随生物质炭浓度的增加呈先增加后降低趋势,MB浓度处理下,荠菜根区土壤养分和植株养分含量达到最大,不同浓度生物质炭处理下的荠菜土壤酶活性和微生物量均显著高于对照(P0.05)。以上研究结果表明,生物质炭的施用促进了荠菜根区土壤养分、微生物特性和酶活性的累积作用和改良土壤肥力作用,以中水平生物质炭(MB)处理下效果最好,而高水平生物质炭(HB)可能会有一定的抑制作用,这还与土壤类型、土壤肥力、植物种类和生态环境等密切相关。
[Abstract]:The results showed that the pH value, bulk density and total salt content of Shepherd purse root region decreased gradually with the increase of biomass carbon concentration. The pH value, bulk density and total salt content of shepherd's purse root area treated with different concentrations of biomass carbon were significantly lower than that of the control.The soil nutrient and plant nutrient content in Shepherd's purse root region increased firstly and then decreased with the increase of biomass carbon concentration. Under the treatment of MB concentration, the soil nutrient and plant nutrient content reached the maximum in Shepherd's purse root region.The soil nutrients and plant nutrient contents of different concentrations of biomass carbon treatment were significantly higher than that of the control group (P0.05).In the root zone of Shepherd's purse, the number of soil microbes was the most (accounting for more than 90% of the total microbes), followed by actinomycetes and fungi.The number of soil bacteria and actinomycetes in Shepherd's purse root region increased first and then decreased with the increase of biomass carbon concentration. Under the treatment of MB concentration, the number of soil bacteria and actinomycetes in Shepherd's purse root region was the largest and significantly higher than that of the control.But biomass carbon significantly decreased the number of soil fungi in Shepherd's purse root zone, but in general, biomass carbon significantly increased the total number of soil microbes in Shepherd's purse root zone.The soil enzyme activity and microbial biomass increased firstly and then decreased with the increase of biomass carbon concentration, the soil nutrient and plant nutrient content reached the maximum in Shepherd's purse root region.The soil enzyme activity and microbial biomass of Shepherd purse were significantly higher than that of the control under different concentrations of biomass carbon.The results showed that the application of biomass carbon promoted the accumulation of soil nutrients, microbial characteristics and enzyme activities and improved soil fertility in the root zone of Shepherd's purse, and the best effect was under the treatment of medium level biomass carbon (MBB).The high level of biomass carbon (HBB) may have a certain inhibitory effect, which is also closely related to soil type, soil fertility, plant species and ecological environment.
【作者单位】：宜宾学院化学与化工学院;
【基金】：四川省宜宾市重点科技计划(编号:2014SF044)
【分类号】：S141;S647

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