【摘要】 采用桶柱和盆栽试验,模拟长残效除草剂土壤残留环境,研究生物炭对土壤物理性状以及异噁草松残留消减的影响。结果表明:土壤中施入水稻秸秆生物炭在2~32 mg·kg-1范围内,容重平均降低0.126 g·cm-3,固相比平均降低21.2%,气相和液相比分别增加29.8%和15.3%,土壤物理性状明显改善;桶柱试验表明,异噁草松主要分布在30 cm以上土层,初始浓度越高,土壤残留量越大;生物炭对土壤中异噁草松的消减有促进作用,随着施炭量的增加,异噁草松土壤残留量降低,对作物的生物有害性降低。更多还原

【Abstract】 The effects of bio-char derived from rice straw on soil physical properties and clomazone residual degradation were studied by barrel column and pot experiments simulating the degradation of persistent herbicides in soil environment. The results showed that when applying 2-32 mg·kg- 1of bio-char in soil,the soil bulk density was decreased on average by 0. 126 g· cm- 3,the solid phase ratio was reduced by an average of 21. 2%,and the gas and liquid phase ratios were increased by 29. 8% and 15. 3%,respectively,which meant that soil physical properties were improved. The barrel column test indicated that clomazone was mainly distributed in the soil layer above 30 cm,and its residue in soil was greater when its initial concentration was higher. Bio-char promoted the degradation of clomazone in the soil. With the increase of bio-char content in soil,clomazone residue in soil was reduced,decreasing its biological hazard to crops.更多还原