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不同灌溉模式对稻田土壤及糙米重金属积累的影响 预览

Effects of different irrigation modes on heavy metal accumulation in paddy soil and brown rice
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摘要 为探讨降低土壤和糙米重金属的灌溉模式,选取江西省萍乡地区的中度重金属污染稻田,研究了灌浆期习惯性灌溉(间歇性灌溉)和长期淹水灌溉2种灌溉模式对水稻产量、糙米重金属及土壤理化性质的影响。结果表明:与习惯性灌溉相比,长期淹水灌溉条件下的水稻产量降低1.25%;糙米Cd和Pb含量分别降低42.79%和3.70%,其中糙米Cr含量显著降低44.81%,但糙米Hg含量显著增加200%,糙米无机As含量增加3.29%;土壤Cd含量降低38.77%,其中土壤有效态Cd含量和阳离子交换量显著降低72.08%和36.71%,但土壤pH和有机质增加0.97%和6.32%;同时相关性分析发现糙米Cr含量与土壤有机质呈显著负相关,与阳离子交换量呈显著正相关,糙米Hg含量与土壤有效态Cd含量和阳离子交换量呈极显著负相关。长期淹水灌溉可有效降低污染稻田土壤Cd进入水稻,实现水稻安全生产,但会增加糙米Hg积累和减产。 To explore the irrigation mode to effects of heavy metals on brown rice, paddy soil, and rice yield, we selected a moderately heavy metal polluted paddy soil from Pingxiang district of Jiangxi province in China. In comparison with the traditional intermittent irrigation, the rice yield decreased about 1.25% under long-term flooding irrigation. The contents of Cd, Pb and Cr in brown rice decreased approximately 42.79%, 3.70% and 44.81%, respectively. The contents of Hg and inorganic As in brown rice increased about 200% and 3.29%, respectively. The content of Cd in paddy soil decreased approximately 38.77%, while the content of available Cd and cation exchange capacity significantly decreased 72.08% and 36.71%, respectively. Interestingly, the pH and the content of organic content in paddy soil increased 0.97% and 6.32%, respectively. The correlation analysis indicated that there was a significant negative correlation between the available Cr level in brown rice and soil organic content, while positive correlation between Cr content in brown rice and cation exchange capacity in paddy soil. The content of Hg in brown rice was significantly and negatively correlated with the available Cd level and cation exchange capacity in paddy soil. This work indicate that the long-term flood irrigation in contaminated paddy soil can effectively reduce the available Cd level in the rice, but result in the increase of Hg accumulation, and the decrease of rice yield in comparison with traditional intermittent irrigation mode.
作者 王惠明 林小兵 黄欠如 刘晖 俞莹 武琳 郭乃嘉 张鸿燕 周青辉 周利军 WANG Huiming;LIN Xiaobing;HUANG Qianru;LIU Hui;YU Ying;WU Lin;GUO Naijia;ZHANG Hongyan;ZHOU Qinhui;ZHOU Lijun(Agricultural Environment Monitoring Stations in Jiangxi Province, Nanchang 330046, China;Jiangxi Institute of Red Soil, Nanchang 330046, China)
出处 《生态科学》 CSCD 2019年第3期152-158,共7页 ECOLOGICAL SCIENCE
基金 江西省重点研发计划项目(20171ACG70022) 江西省重点研发计划项目(20171BBH80020) 国家重点研发计划项目(2016YFD0300906).
关键词 灌溉模式 稻田土壤 糙米 重金属 水稻产量 irrigation modes paddy soil brown rice heavy metal rice yield
作者简介 王惠明(1965-),男,江西萍乡人,高级农艺师,本科,主要从事农业资源环境保护与农村能源工作,E-mail:923234200@qq.com;通信作者:周利军,男,硕士,农艺师,主要从事土壤重金属修复方面的研究,E-mail:huoe861200@163.com.
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