摘要
通过大田试验研究了灌施沼液对水稻产量、重金属含量、土壤肥力和土壤环境质量的影响。结果表明,施用沼液能够有效提高水稻籽粒产量和稻秆生物量;提高稻秆N、P、K含量和籽粒N含量,促进N、P、K养分的累积。与无肥对照相比,随着沼液用量的增加稻秆As含量有增加的趋势,籽粒As以及稻秆和籽粒Pb含量没有升高风险,而稻秆和籽粒Cd含量随沼液用量增加呈下降趋势,稻秆和籽粒中Hg与Cr未检出。施用沼液土壤有机质得到明显提高,改善土壤p H;而土壤重金属Cd、Cr、As 、Pb、Hg含量均符合国家土壤质量二级标准值(GB 15618-1995),无重金属污染风险;但As、Cr含量与沼液呈显著或极显著正相关,长期施用沼液有可能导致土壤As、Cr含量超标。
The effects of paddy field disposal of biogas slurry on rice production,heavy metal content in rice grain and straw,soil fertility and environment quality were investigated in field experiment with treatments of control （no fertilizer input） and different dosage of biogas slurry （200,400,600,800,1 000 m3/hm2）.Results showed that yield of rice grain and straw increased with biogas slurry application,the concentration of nitrogen（N）,phosphorus（P） and potassium（K） in rice straw and the concentration of N in rice grain enhanced,therefore,the accumulation of N,P and K were improved.With biogas slurry dosage increased,the concentration of arsenic （As） in rice straw enhanced compared to control,while the concentration of As in rice grain and lead （Pb） in rice grain and straw were not improved,however,the concentration of cadmium （Cd） in rice grain and straw decreased.The mercury （Hg） and chrome （Cr） were not detected in rice grain and straw in this experiment.Furthermore,the soil organic matter was enhanced with biogas slurry application,soil p H was improved compared to control.In addition,the contents of Cd,Cr,As,Pb and Hg in soil were lower than the corresponding limitations in the NationalSoil Environment Quality Standards（ GB 15618-1995）,there was no risk of heavy metal contamination. However,there were significant and markedly significant positive correlations between soil As,Cr concentration and dosage of biogas slurry,respectively. Thus,it should not be neglected that long-term amended with biogas slurry would lead to environment pollution due to As and Cr accumulation.
出处
《广东农业科学》
CAS
2016年第10期69-76,共8页
Guangdong Agricultural Sciences
基金
广东省科技计划重点项目(2012A020100003
2014B090904068)
关键词
沼液
水稻
产量
养分
土壤
重金属
biogas slurry
rice
yield
nutrient
soil
heavy metal
