【摘要】：以太倉市郊大棚菜地土壤為研究對象,研究了太倉市典型大棚菜地土壤鹽分累積現(xiàn)狀及變化規(guī)律。結果表明:太倉市郊大棚菜地土壤全鹽含量平均值為3.38 g/kg,已達輕度鹽化水平;大棚菜地土壤鹽分累積區(qū)域分布差異較大,最小值為0.42 g/kg,最大值達12.6 g/kg,變異系數(shù)達65.7%;大棚菜地土壤鹽分累積量有69.84%超過安全水平,其中51.59%為輕度鹽土,10.32%為中度鹽土,5.56%為重度鹽土;大棚菜地土壤鹽分累積分布具有明顯的地域性,以瀏河鎮(zhèn)、沙溪鎮(zhèn)和新區(qū)發(fā)生鹽化現(xiàn)象最為嚴重,鹽化土所占比例分別達91.4%、91.0%和83.0%;八大離子組成中,陽離子以Ca~(2+)為主,其次為Na~+和K~+,陰離子以NO_3~ 為主,其次為Cl~ 和SO_4~(2 );相關性分析表明,影響太倉市郊菜地土壤發(fā)生鹽化的主要因素是全鹽含量、NO_3~ 、Cl~ 、Ca~(2+)等指標,造成土壤發(fā)生次生鹽漬化的主要原因是不合理施肥、種植及管理模式等人為外在因素;太倉市郊菜地土壤鹽分含量隨著大棚種植年限的增加而顯著提高,在種植年限為4~5 a時達到峰值,平均值為3.64 g/kg,是種植年限為1 a的大棚土壤含鹽量的1.29倍。
[Abstract]:The present situation and variation of salt accumulation in the soil of vegetable field in Taichang suburb were studied in this paper. The results showed that the average value of total salt content was 3.38 g / kg, which reached the level of slight salinization, and the regional distribution of soil salt accumulation was different. The minimum value was 0.42 g / kg, the maximum value was 12.6 g / kg, the coefficient of variation was 65.7%, the accumulation of salt in greenhouse soil exceeded the safe level, 51.59% was mild salt soil, 10.32% was moderate salt soil, 5.56% was heavy salt soil, and 51.59% was mild salt soil, 10.32% medium salt soil and 5.56% heavy salt soil. The accumulative distribution of soil salt in greenhouse vegetable land was obvious, especially in Liuhe Town, Shaxi Town and New area. The proportion of salinized soil was 91.4% and 83.0%, respectively, and the cations were mainly Ca~ (2). The results of correlation analysis showed that the main factors affecting the salinization of vegetable soil in Taicang suburb were total salt content, NO_3~, Cl~, Ca~ (2) and so on. The main causes of soil secondary salinization were unreasonable fertilization, planting and management patterns, and soil salt content in vegetable fields in the suburbs of Taicang City increased significantly with the increase of greenhouse planting years. The average value was 3.64 g 路kg ~ (-1), which was 1.29 times as much as that of the greenhouse soil.
【作者單位】： 太倉市土壤肥料站;
【基金】：2017年省重點研發(fā)計劃項目(BE2017380) 2014年太倉市科技計劃項目(TC2014NY02) 太倉市農業(yè)面源污染綜合治理試點項目資助
【分類號】：S156.4

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本文編號：2268011