土壤中不同类型微塑料对生菜氮吸收和代谢的影响 |
摘要点击 999 全文点击 82 投稿时间:2024-04-18 修订日期:2024-07-19 |
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中文关键词 微塑料类型 土壤污染 生态风险 蔬菜养分吸收 氮代谢 抗氧化酶 |
英文关键词 types of microplastics soil contamination ecological risk nutrient uptake by vegetable nitrogen metabolism antioxidant enzymes |
DOI 10.13227/j.hjkx.20250654 |
作者 | 单位 | E-mail | 张婷婷 | 南京信息工程大学生态与应用气象学院, 江苏省农业气象重点实验室, 南京 210044 | tingtzhang0613@163.com | 罗小三 | 南京信息工程大学生态与应用气象学院, 江苏省农业气象重点实验室, 南京 210044 | xsluo@nuist.edu.cn | 陈志怀 | 南京信息工程大学生态与应用气象学院, 江苏省农业气象重点实验室, 南京 210044 | | 童欣 | 南京信息工程大学生态与应用气象学院, 江苏省农业气象重点实验室, 南京 210044 | | 刘欣 | 南京信息工程大学生态与应用气象学院, 江苏省农业气象重点实验室, 南京 210044 | | 郭豪华 | 南京信息工程大学生态与应用气象学院, 江苏省农业气象重点实验室, 南京 210044 | | 范佳毅 | 南京信息工程大学生态与应用气象学院, 江苏省农业气象重点实验室, 南京 210044 | | 姚雪雯 | 南京信息工程大学生态与应用气象学院, 江苏省农业气象重点实验室, 南京 210044 | |
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中文摘要 |
为揭示不同类型微塑料(粒径<5 mm)对作物氮吸收和代谢的影响差异,选用可降解微塑料聚乳酸(PLA)和聚对苯二甲酸-己二酸丁二醇酯(PBAT)以及难降解微塑料聚乙烯(PE)分别进行3种质量分数处理(0.5%、1%和3%)的蔬菜盆栽试验. 研究了土壤-生菜(Lactuca sativa L.)系统无机氮含量、作物生长、氮吸收和氮代谢酶活性对土壤微塑料污染的响应. 结果表明,微塑料显著限制了土壤有机碳(SOC)分解、生菜硝态氮(NO3--N)还原和累积,提高了土壤C/N和铵态氮(NH4+-N)含量. PE处理下土壤全氮(TN)含量比PLA和PBAT处理分别低0.25~0.52 g·kg-1和0.33~0.52 g·kg-1. PBAT处理时生菜干重和氮累计吸收量显著低于PLA和PE处理(P<0.05). 对于微塑料的输入量影响,1%处理时生菜抗氧化酶活性和硝酸还原酶(NR)活性最低且丙二醛(MDA)含量最高,其中NR活性和MDA含量分别是对照的15.19%~42.01%和2.68~3.11倍. 机制方面,生菜氮吸收与土壤SOC极显著负相关(P<0.01). 综上,土壤中的微塑料输入会降低生菜的氮代谢酶活性,可降解的PBAT处理显著降低生菜氮吸收量,中度污染时对生菜的氧化损伤效应更强. |
英文摘要 |
To illuminate the differences in the effects of different types of microplastics (MPs, size<5 mm) on crop nitrogen absorption and metabolism, the degradable polylactic acid (PLA) and polybutylene terephthalate (PBAT) and undegradable polyethylene (PE) were selected for vegetable pot experiments with three doses (0.5%, 1%, and 3%). The responses of inorganic nitrogen content, plant growth, nitrogen absorption, and metabolism enzyme activity to soil MPs pollution in the soil-lettuce (Lactuca sativa L.) system was investigated. The results showed that MPs significantly hindered the decomposition of soil organic carbon (SOC) and reduction and accumulation of nitrate (NO3--N) in lettuce, while increasing soil C/N and ammonium (NH4+-N) content. The total nitrogen (TN) content of soil under the PE treatment was lower than that of the PLA and PBAT treatments for 0.25-0.52 g·kg-1 and 0.33-0.52 g·kg-1, respectively. PBAT treated lettuce had significantly lower dry weight and accumulated N uptake compared to those in the PLA and PE treatments (P<0.05). The 1% dose resulted in the lowest antioxidant enzyme and nitrate reductase (NR) activities and the highest malondialdehyde (MDA) content, with NR activity and MDA content being 15.19%-42.0% and 2.68-3.11 times of the control, respectively. Regarding to the mechanism, N uptake by lettuce was significantly negatively correlated with SOC (P<0.01). In summary, the MPs input to soil can reduce the activity of N metabolism enzymes in lettuce. The degradable PBAT significantly reduced the N uptake, and the oxidative damage to lettuce was greater under moderate pollution. |