复配改良剂表施对高降雨量地区茶园底层强酸性土壤酸度的调控（英文）

发布时间：2017-09-17 12:10

  本文关键词：复配改良剂表施对高降雨量地区茶园底层强酸性土壤酸度的调控（英文）

  更多相关文章： Al saturation leaching nitrate organic amendments organic anions pH soil acidity soil alkalinity

【摘要】：Strongly acidic soils(pH 5.0) are detrimental to tea(Camellia sinensis) production and quality.Little information exists on the ability of surface amendments to ameliorate subsoil acidity in the tea garden soils.A 120-d glasshouse column leaching experiment was conducted using commonly available soil ameliorants.Alkaline slag(AS) and organic residues,pig manure(PM) and rapeseed cake(RC) differing in ash alkalinity and C/N ratio were incorporated alone and in combination into the surface(0—15 cm) of soil columns(10 cm internal diameter × 50 cm long) packed with soil from the acidic soil layer(15-30 cm) of an Ultisol(initial pH =4.4).During the 120-d experiment,the soil columns were watered(about 127 mm over 9 applications) according to the long-term mean annual rainfall(1143 mm) and the leachates were collected and analyzed.At the end of the experiment,soil columns were partitioned into various depths and the chemical properties of soil were measured.The PM with a higher C/N ratio increased subsoil pH,whereas the RC with a lower C/N ratio decreased subsoil pH.However,combined amendments had a greater ability to reduce subsoil acidity than either of the amendments alone.The increases in pH of the subsoil were mainly ascribed to decreased base cation concentrations and the decomposition of organic anions present in dissolved organic carbon(DOC) and immobilization of nitrate that had been leached down from the amended layer.A significant(P 0.05) correlation between alkalinity production(reduced exchangeable acidity — N-cycle alkalinity) and alkalinity balance(net alkalinity production — N-cycle alkalinity) was observed at the end of the experiment.Additionally,combined amendments significantly increased(P 0.05) subsoil cation concentrations and decreased subsoil Al saturation(P 0.05).Combined applications of AS with organic amendments to surface soils are effective in reducing subsoil acidity in high-rainfall areas.Further investigations under field conditions and over longer timeframes are needed to fully understand their practical effectiveness in ameliorating acidity of deeper soil layers under naturally occurring leaching regimes.
【作者单位】： Nanjing
【关键词】： Al saturation leaching nitrate organic amendments organic anions pH soil acidity soil alkalinity
【基金】：supported by the National Natural Science Foundation of China(No.41401336) the Natural Science Foundation of Jiangsu Province,China (No.BK20130105) the State Key Laboratory of Soil and Sustainable Agriculture,Chinese Academy of Sci-ence(No.Y412201452) the Environmental Protection Public Benefit Research Foundation of China (No.201309036)
【分类号】：S156.6
【正文快照】： INTRODUCTION Tea(Camellia sinensis),one of the three commonbeverages(coffee,tea and cacao)widely cultivated intropical and subtropical areas(Pham-Huy et aZ.,2008),has many beneficial efTects on human health.Tea fa-vors acidic soils but also further acidi

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