再生水灌溉对草坪土壤速效养分及盐碱化的效应  

Effects of Irrigation with Reclaimed Water on Available Nutrient and Salinize-alkalization

作　　者：彭致功[1] 杨培岭[1] 王勇[1] 任树梅[1] 

机构地区：[1]中国农业大学水利与土木工程学院,北京100083

出　　处：《水土保持学报》2006年第6期84-88,共5页Journal of Soil and Water Conservation

基　　金：国家高技术研究发展计划子课题(2002AA2z4281-06)

摘　　要：采用7种水分处理:清水适宜灌(FP I)、混合适宜灌(RFP I)、再生水充分灌(RF I)、再生水适宜灌(RP I)、再生水轻微干旱胁迫(RLW S)、再生水中度干旱胁迫(RMW S)、再生水重度干旱胁迫(RSW S),相应灌溉下限分别为田间持水量70%,70%,80%,70%,60%,50%,40%,灌水定额相同。研究结果表明:与清水灌溉相比,短期内采用再生水灌溉不会使大量氮素残留于土壤,不会快速提高土壤供磷水平,土壤速效钾含量增加不显著,土壤阳离子含量增加也不显著。再生水灌溉不同水分处理下,土壤养分元素累积量与供水量成反比,特别是在中度及重度干旱胁迫处理下土壤速效养分累积明显。通过对再生水灌溉下土壤化学性质主成分分析表明,再生水灌溉下土壤盐分离子及氮钾元素变化较快,其次是水溶性钠离子,再次为速效磷。Seven irrigation treatments were conducted, proper irrigation with fresh water（FPI）, proper irrigation with 1 ： 1 proportion of fresh and reclaimed water（RFPI）, full irrigation with reclaimed water（RFI）, proper irrigation with reclaimed water（RPI）, light water stress irrigation with reclaimed water（RLWS）, medium water stress irrigation with reclaimed water（RMWS）, severe water stress irrigation with reclaimed water（RSWS）. The irrigation start-point is 70%fc（field water capacity）, 70%fc, 80%fc, 70%fc, 60%fc, 50%fc, 40%re, respectively. For seven treatments, irrigation amount for an irrigation event is the same. The experimental results showed that the rudimental rate of soil nitrogen irrigated with reclaimed water was not so high compared with the treatment irrigated with fresh water. The supplemental phosphorus level would be not increased unexpected for treatment irrigated with reclaimed water. At the same time, the available potassinum in soil changed little. The content of soil cation was not significantly increased. The correlation between the content of soil nutrient and the water supply was reverse for water treatments irrigated with reclaimed water. For example, the soil available nutrients increased obviously in medium water stress irrigation with reclaimed water and severe water stress irrigation with reclaimed water. The principal component analysis of soil chemical properties irrigated with reclaimed water showed that the change of ion contents, nitrogen contents and potassinum contents was most rapid, next was the change of water-soluble sodium contents, the third was the change of soil available phosphorus contents.

关 键 词：再生水 草坪 土壤化学性质 主成分分析 

分 类 号：S275.3[农业科学—农业水土工程] S158.3[农业科学—农业工程]