摘要
生活污泥的土地利用是污泥处置的有效途径,对贫瘠土壤改良具有良好的效果。本研究将市政污泥进行好氧和蚯蚓堆肥处理,通过3年的田间试验,探究堆肥污泥和污泥蚓粪对辽西北风沙土的改良效果,分析风沙土理化性质及不同土层重金属含量的变化。结果表明:与对照(CK)相比,分别施入30 t·hm^(-2)的堆肥污泥和污泥蚓粪能有效提高风沙土的含水率和孔隙度,降低土壤容重,其中施入堆肥污泥的风沙土含水率最大可提高95.6%,施入污泥蚓粪的孔隙度最高可提高8.0%,施入污泥蚓粪的土壤容重最高可降低11.4%;同时也提高了土壤肥力和土壤营养元素的含量,其中施入堆肥污泥的风沙土碱解氮、速效磷、速效钾含量最大涨幅分别为19.0、119.5、6.1倍,电导率最大可提高7.6倍,阳离子交换量最大可提高9.7倍;施入污泥蚓粪处理,紫花苜蓿叶片鲜重较CK增加32.2%;施入两种改良剂后,风沙土不同土层重金属浓度均低于《土壤环境质量:农用地土壤污染风险管控标准(试行)》(GB 15618—2018)的风险筛选值;重金属的单因子潜在生态风险和综合潜在生态风险评价均处于安全范围。
The use of domestic sludge is an effective way of sludge disposal and has a good effect on the quality of nutrient-poor soil.In this study,municipal sludge was treated by aerobic composting and earthworm composting.The effect of sludge compost and sludge vermicompost on aeolian sandy soil in northwest Liaoning Province was examined in a 3-year field experiment.The physical and chemical properties of aeolian sandy soil and heavy metal content in different soil layers were analyzed.The results showed that the application of 30 t·hm^(-2) of sludge compost and sludge vermicompost effectively improved moisture content and porosity of the aeolian sandy soil,and reduced the soil bulk density.The moisture content of the aeolian sandy soil applied with sludge compost was increased by 95.6%,and the porosity of soil applied with sludge vermicompost was increased by 8.0%.Sludge vermicompost application reduced soil bulk density by 11.4%.Meanwhile,soil fertility and soil nutrient content were improved.The contents of alkali-hydrolyzed nitrogen,available phosphorus and available potassium of the aeolian sandy soil applied with sludge compost increased by 19.0 times,119.5 times and 6.1 times,while electrical conductivity of the aeolian sandy soil applied with sludge compost increased by 7.6 times.The maximum increase of cation exchange capacity of aeolian sandy soil applied with sludge compost was 9.7 times.When treated with sludge vermicompost,fresh weight of alfalfa leaves increased by 32.2%.Under both amendments,the concentrations of heavy metals in different layers of aeolian sandy soil were lower than the risk screening values in the“Standard for the Control of Soil Pollution Risk of Agricultural Land(Trial)”(GB 15618-2018).The results of single factor potential ecological risk and comprehensive potential ecological risk assessment of heavy metals are both in the safe range.
作者
姜晓煜
周姝慧
吕林有
何苗苗
汤家喜
JIANG Xiaoyu;ZHOU Shuhui;LV Linyou;HE Miaomiao;TANG Jiaxi(College of Environmental Science and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;Ordos Institute of Liaoning Technical University,Ordos 017010,Inner Mongolia,China;Institute of Sand Management and Utilization of Liaoning Province,Fuxin 123000,Liaoning,China;School of Civil Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;Liaoning Academy of Agricultural Sciences,Shenyang 110161,China)
出处
《生态学杂志》
北大核心
2025年第7期2285-2296,共12页
Chinese Journal of Ecology
基金
辽宁省“兴辽英才计划”项目资助(XLYC2203077)
辽宁省应用基础研究计划项目(2022JH2/101300123)
国家级大学生创新训练项目(202310147020)
中央财政林业科技推广示范项目(辽[2022]TG 14号)
辽宁省科技重大专项“辽西北防沙治沙关键技术研究与示范”资助。
关键词
堆肥污泥
污泥蚓粪
风沙土
土壤理化性质
重金属
生态风险
sludge compost
sludge vermicompost
aeolian sandy soil
soil physical and chemical properties
heavy metal
ecological risk
