滨海盐碱地土壤质量指标对生态改良的响应

Response of soil quality indicators to comprehensive amelioration measures in coastal salt-affected land

为揭示滨海盐碱地土壤质量指标对生态改良的应激性变化规律,以滨海盐碱地生态改良而成的林带土壤为研究对象,改良前土壤为空白对照和农田与荒地土壤为过程参照,研究了滨海盐碱地土壤质量指标对生态改良的响应敏感性、响应过程和响应度。结果显示:滨海盐碱地土壤含盐量、有机质和全氮指标对综合生态改良措施响应敏感性强,响应迅速,规律性强且响应度大。土壤全磷和有效磷指标对综合生态改良措施有响应但规律性不强。土壤脱氢酶活性指标试验期内对综合生态改良措施有一定的响应度。土壤pH值、全钾、有效钾和过氧化氢酶指标试验期内对综合生态改良措施无明显响应。表明滨海盐碱地生态改良措施在初期(2a内)已显成效,该地区土壤的含盐量、有机质和全氮指标易受生态改良,而土壤酸碱度调控较难,其它指标的生态调控性还需要进一步研究。

To probe the irritability of soil quality indicators on comprehensive amelioration measures applied in coastal salt-affected land of Hangzhou bay,the soil profiles in the ameliorated zone were investigated by comparisons with controls,those in the same zone before amelioration activity as temporal controls and in the wasteland and farmland nearby as procedure controls,revealing the response of soil quality indicators to comprehensive amelioration measures through three aspects as sensitivity,process and responsivity.The results showed that soil salt content,organic matter and total nitrogen（TN） were susceptible to the comprehensive amelioration measures and had a regularly changing tendency.Soil total phosphorus（TP） and available phosphorus were also sensitive to comprehensive amelioration measures but the tendency was not steady.Soil dehydrogenase activity was somewhat responsive to comprehensive amelioration measures.But soil pH,total potassium（TK）,available potassium and catalase activity had no obvious responses to comprehensive amelioration measures in the period of 2 years.It was concluded that the comprehensive amelioration measures had already affected positively the quality of soil in coastal salt-affected land only after afforestation in 2 years.Salt content,organic matter and total nitrogen of soil in coastal saline land were approved to be modified easily through ecological measures,but soil pH in the same area was hard to be ameliorated.In addition,it must be pointed out that the effect of eco-control ways on the other soil indicators still needed to further probe.