摘要
运用生物地球化学循环的原理,对江苏南部丘陵地区黄棕壤有机铝的来源,富集机制及其对土壤酸化的影响进行了研究.结果表明,植茶后土壤 pH 值降低,铝饱和度增高,各种(?)态铝、铝络合度、络合铝占非晶质铝的百分数增高,土壤有机质数且亦增多;茶园含铝有机物分解一年后,铝的残留率可达70%以上。有5～500mgL^(-1)的单宁类有机物释放并与溶液中铝离子形成有机络合物;土壤对单宁酸和铝的吸附使土壤交换性酸增高0.1～1.35cmolkg^(-1).因此,茶园土壤的有机铝主要通过茶树群体的生物地球化学循环逐渐积累,茶树群体的生长状况及植茶时间长短制约着土壤有机铝的富集程度和茶园土壤酸化的发展.
A study on accumulation of organic aluminium under tea plantation and its effects on soillcidification was carried out in yellow-brown soil in hilly area of southern Jiangsu Province.The resultsshowed that the soil pH,A1 saturation,different forms of Al,the percentage of organic compex Al to freeAI and to amorphous AI,soil organic matter content increased with the raising of years for tea plantation.The residue of A1 in tea litter was above 70% after one year's decomposition.The soluble organic matter(5～5000mg L^(-1)released by tea litter in the form of tannin complexed with Al in soil percolating water.Thesoil exchangeable acidity increased 0.1～1.35 cmolkg^(-1)after soil adsorbed both Al and tannin.A schematicdiagram was showed for explaining the cycle of Al and its effect on soil acidification in tea planta tions.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
1992年第2期61-66,共6页
Journal of Nanjing Agricultural University
基金
高等学校博士学科点基金
关键词
黄棕壤
土壤
酸化
茶树
有机铝
yellow-brown soil
soil acidification
tea tree
biological cycle
organic complex Al
