水土保持学报2012，Vol.26Issue(1)：128-135,8.
川西漂洗水稻土亚铁时空分布对土地利用/覆被变化的响应
Spatiotemporal Distribution Characteristics of Fe（Ⅱ） in Bleached Paddy Soil in the West Sichuan Basin and Its Response to LUCC
摘要
Abstract
Iron is an environmentally sensitive element.In order to understand the temporal and spatial distribution characteristics of soil Fe（Ⅱ） in bleached paddy soil of the west Sichuan basin after land use/cover change,this study selected the paddy fields,dryland,and tea garden of different planting years transformed from paddy fields at the third,fourth,and fifth terraces in Mingshan county,Sichuan province as sampling plots.Firstly,soil samples were collected from the surface down by 10 cm space in May,July,September,2009,and January,March,2010.Then,the Fe（Ⅱ） content,soil moisture,redox potential,total reduced material,pH,total organic carbon,humus composition and amorphous iron and other indicators were measured.Finally,the vertical distribution,seasonal dynamics of soil Fe（Ⅱ） and its influencing factors were discussed.The results showed that land-use change and time extension of tea plantation,could change soil water status,redox potential,the amount of reduced material,and amorphous iron,so that soil Fe（Ⅱ） content in bleached paddy soil in the west Sichuan basin changed,but there were different features in different terraces.From the paddy fields（dry） to 1-year（3 years old） and then 6 years old tea garden on the third-level terraces and four terraces,soil Fe（Ⅱ） content decreased after the first drop overall,but from paddy fields to 3 years old and then to 7 years old tea garden on the fifth terrace,soil Fe（Ⅱ） content first rose and then decreased overall;modern micro-domain reducing environment or geologic-period reducing environment had caused soil Fe（Ⅱ） content no longer followed the distribution law that soil Fe（Ⅱ） content gradually decreased from top to bottom,but soil iron accumulated in the bottom,up to 4 739 mg/kg.The seasonal dynamic characteristics of soil Fe（Ⅱ） content in the topsoil had not significantly changed,and main accumulation period were in September or July.This study would provide a rational use for the soil/land resources in reference area.关键词
亚铁/垂直分布/季节动态/水田/茶园/种植年限Key words
Fe(Ⅱ)/vertical distribution/seasonal dynamics/paddy field/tea garden/planting years分类
农业科技引用本文复制引用
袁大刚,谭海燕,程伟丽,杨大东,王昌全,吴德勇..川西漂洗水稻土亚铁时空分布对土地利用/覆被变化的响应[J].水土保持学报,2012,26(1):128-135,8.基金项目
国家自然科学基金青年基金项目 （）
四川省科技富民强县重点项目 （）
