摘要
采用连续化学提取法对粤东凤凰山茶区12个大型茶园共60份土壤样品中Cu和Cr的5种化学形态分布和茶叶有效性进行研究。结果发现,土壤中Cu的5种化学形态的分布规律为残渣态>有机束缚态>铁锰氧化态>碳酸盐态>交换态,而Cr的化学形态分布为残渣态>有机束缚态>交换态>碳酸盐态>铁锰氧化态。可交换态Cu和有机束缚态Cu含量与土壤有机质呈显著正相关,而土壤pH值与土壤可交换态Cu呈极显著负相关,与碳酸盐态Cu呈极显著正相关,与有机束缚态Cu和铁锰氧化态Cu呈显著正相关。可交换态Cr含量与土壤有机质呈显著正相关,而土壤pH值与土壤可交换态Cr呈极显著负相关,与碳酸盐态Cr呈极显著正相关。凤凰山茶叶Cu含量的范围在41.20～118.93mg·kg-1之间,平均为52.92mg·kg-1。茶叶中Cu含量与土壤可交换态Cu、有机束缚态Cu、有机质都有显著的正相关性,而与土壤pH值有显著的负相关性。茶叶Cr含量的范围在2.73～6.29mg·kg-1之间,平均为4.13mg·kg-1。茶叶Cr含量与土壤有机质和pH值分布呈显著正相关和显著负相关。
The fractionation of Cu, Cr and the relationships between Cu, Cr fractions and soil properties were studied by collecting soils from 12 tea gardens of Fenghuang mountain in east of Guangdong Province and using sequential extraction procedure for the speciation of Cu and Cr in the soils, i.e. carbonate（Carb-Cu and Carb-Cr）, exchangeable（Ex-Cu and Ex-Cr）, Fe/Mn oxides（Fe/Mn-Cu and Fe/Mn-Cr）, organic matter（Or-Cu and Or-Cr）, and residual（Residual-Cu and Residual-Cr）. What′s more, the distribution of Cu and Cr content in tea leaves, correlated with the fractionation of Cu and Cr in soils was discussed in this paper. The results showed that the contents of different Cu forms were decreased in the order：Residual-CuOr-CuFe/Mn-CuCarb-CuEx-Cu. As the contents of different Cr forms were decreased in the order：Residual-CrOr-CrEx-CrCarb-CrFe/Mn-Cr. Correlation analyses indicated that the soil properties, pH and organic matter affected the fractionation of Cu and Cr in tea garden soils differently. As to the tea leaves, results showed that the Cu content in tea leaves was between 41.20~118.93 mg·kg^-1,52.92 mg·kg^-1 in average. In addition, the high positive correlation was found between the Cu content in tea leaves and Ex-Cu,Ox-Cu and soil organic matter, but negative correlated with soil pH. The Cr content in tea leaves was between 2.73-6.29 mg·kg^-1, 4.13 mg·kg^-1 in average. The Cr content in tea leaves was high positive correlated with soil organic matter and high negative correlated with soil pH.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2011年第7期1314-1320,共7页
Journal of Agro-Environment Science
基金
广东省科技计划资助项目(2007B020705001)
韩山师范学院青年科研基金项目(413814)
关键词
Cu、Cr
化学形态
茶园
土壤理化性质
Cu
Cr
chemical forms
tea garden
physical and chemical properties of soils
