农业环境科学学报
農業環境科學學報
농업배경과학학보
Journal of Agro-Environment Science
2015年
9期
1754-1760
,共7页
土壤团聚体%植茶年限%全氟%水溶态氟
土壤糰聚體%植茶年限%全氟%水溶態氟
토양단취체%식다년한%전불%수용태불
soil aggregates%tea plantation year%total fluoride%water-soluble fluoride
为弄清土壤团聚体全氟和水溶态氟含量对植茶年限的响应特征,采用野外实地调查和室内分析相结合的方法,以植茶16、23、31、53 a土壤为研究对象,开展不同植茶年限对土壤团聚体全氟和水溶态氟含量分布特征研究。结果表明:土壤全氟和水溶态氟含量均随粒径的减小而升高,且主要分布于<0.25 mm粒径团聚体,分别为444.40~566.98 mg·kg-1和0.80~1.22 mg·kg-1;随植茶年限的延长,各粒径团聚体全氟和水溶态氟含量均逐渐升高,且0~20 cm土层高于20~40 cm土层;土壤团聚体对全氟和水溶态氟的贡献率分别有48%~73%和46%~70%来自>5 mm粒径团聚体。随植茶年限的延长,>5 mm粒径团聚体对土壤全氟和水溶态氟的贡献率均先升高后降低,且在植茶23 a时最高,可达68%~73%,而其他粒径团聚体则呈相反的趋势。不同粒径团聚体对土壤全氟和水溶态氟的保持和供应能力存在明显差异,全氟和水溶态氟有向小粒径团聚体富集的趋势。随植茶年限的延长,土壤团聚体全氟和水溶态氟逐渐增加呈表聚特征,其中<5 mm粒径团聚体对土壤全氟和水溶态氟的累积作用在植茶23 a后更为明显。因此,在茶园生产管理上,应注意植茶23 a后茶园0~20 cm土层水溶态氟含量的变化,以降低土壤氟进入茶叶的风险,服务于茶叶产品质量安全。
為弄清土壤糰聚體全氟和水溶態氟含量對植茶年限的響應特徵,採用野外實地調查和室內分析相結閤的方法,以植茶16、23、31、53 a土壤為研究對象,開展不同植茶年限對土壤糰聚體全氟和水溶態氟含量分佈特徵研究。結果錶明:土壤全氟和水溶態氟含量均隨粒徑的減小而升高,且主要分佈于<0.25 mm粒徑糰聚體,分彆為444.40~566.98 mg·kg-1和0.80~1.22 mg·kg-1;隨植茶年限的延長,各粒徑糰聚體全氟和水溶態氟含量均逐漸升高,且0~20 cm土層高于20~40 cm土層;土壤糰聚體對全氟和水溶態氟的貢獻率分彆有48%~73%和46%~70%來自>5 mm粒徑糰聚體。隨植茶年限的延長,>5 mm粒徑糰聚體對土壤全氟和水溶態氟的貢獻率均先升高後降低,且在植茶23 a時最高,可達68%~73%,而其他粒徑糰聚體則呈相反的趨勢。不同粒徑糰聚體對土壤全氟和水溶態氟的保持和供應能力存在明顯差異,全氟和水溶態氟有嚮小粒徑糰聚體富集的趨勢。隨植茶年限的延長,土壤糰聚體全氟和水溶態氟逐漸增加呈錶聚特徵,其中<5 mm粒徑糰聚體對土壤全氟和水溶態氟的纍積作用在植茶23 a後更為明顯。因此,在茶園生產管理上,應註意植茶23 a後茶園0~20 cm土層水溶態氟含量的變化,以降低土壤氟進入茶葉的風險,服務于茶葉產品質量安全。
위롱청토양단취체전불화수용태불함량대식다년한적향응특정,채용야외실지조사화실내분석상결합적방법,이식다16、23、31、53 a토양위연구대상,개전불동식다년한대토양단취체전불화수용태불함량분포특정연구。결과표명:토양전불화수용태불함량균수립경적감소이승고,차주요분포우<0.25 mm립경단취체,분별위444.40~566.98 mg·kg-1화0.80~1.22 mg·kg-1;수식다년한적연장,각립경단취체전불화수용태불함량균축점승고,차0~20 cm토층고우20~40 cm토층;토양단취체대전불화수용태불적공헌솔분별유48%~73%화46%~70%래자>5 mm립경단취체。수식다년한적연장,>5 mm립경단취체대토양전불화수용태불적공헌솔균선승고후강저,차재식다23 a시최고,가체68%~73%,이기타립경단취체칙정상반적추세。불동립경단취체대토양전불화수용태불적보지화공응능력존재명현차이,전불화수용태불유향소립경단취체부집적추세。수식다년한적연장,토양단취체전불화수용태불축점증가정표취특정,기중<5 mm립경단취체대토양전불화수용태불적루적작용재식다23 a후경위명현。인차,재다완생산관리상,응주의식다23 a후다완0~20 cm토층수용태불함량적변화,이강저토양불진입다협적풍험,복무우다협산품질량안전。
Soil fluoride status directly influences the tea quality. In order to understand the effects of tea-planting years on total fluoride and water-soluble fluoride content in soil aggregates, soil samples collected from tea plantation with four different years(16, 23, 31 years and 53 years)were examined. Results showed:The content of total fluoride and water-soluble fluoride increased with decreasing sizes of soil ag-gregates, and distributed mainly in <0.25 mm aggregate, which were 444.40~566.98 mg·kg-1 and 0.80~1.22 mg·kg-1, respectively. The content of total fluoride and water-soluble fluoride in soil aggregates of all sizes increased significantly over planting years, with higher in 0~20 cm than in 20~40 cm soil. The contributions of total fluoride and water-soluble fluoride in>5 mm soil aggregates to the whole soil were 48%~73%and 46%~70%, respectively, and they displayed a inverse“V”pattern over planting years, with the greatest contribution rates (68%~73%)found in the 23rd years. The opposite patterns appeared in the other soil aggregates. The total and water-soluble fluoride were significantly different among different soil aggregates, and accumulated in surface soil as plantation year increased. In addition,<5 mm ag-gregates played an obvious role in the accumulation of total fluoride and water-soluble fluoride in soils with more than 23 years of planta-tion. Therefore, attentions may be paid to the content of water-soluble fluoride in the 0~20 cm soil layer when the tea plantation is more than 23 years in order to reduce the risk of high fluoride tea.