为促进滨海区域粮食生产,以盐渍化麦田为研究对象,在测定土壤(0~20 cm)基本性质及小麦产量、生物量基础上,分析土壤肥力特征与小麦生产能力间的关系。结果表明,土壤含盐量与小麦产量、地上部生物量(生物量)呈极显著负相关(p<0.01),其关系符合三次函数方程。若以4 500 kg hm-2作为最低目标产量,土壤含盐量应在3.1 g kg-1以下。土壤有机质含量与土壤含盐量呈显著负相关(p<0.05),与小麦产量、生物量呈极显著正相关(p<0.01)。土壤有机质含量增加能够降低盐渍化程度,促进小麦生产。将直接相连的下层(>10~20 cm)与上(表)层(0~10 cm)土壤含盐量比值作为抑盐效率(E),来评价有机质的抑盐作用,表层土壤有机质含量与E符合二次函数方程,有机质含量超过19.1 g kg-1时,抑盐效果显著,可以作为土壤肥力培育目标值。此外,提高土壤速效钾含量对小麦生产也具有显著促进作用。研究结果对研究区域及相似地区进行土壤肥力培育和粮食生产具有重要意义。
【英文摘要】
To boost food production in coastal regions,a study was carried out to analyze relationships between soil properties and wheat production. For that end,soil samples were collected in the soil layer( 0 ~ 20cm) of salinized wheat fields for determination of soil physicochemical properties,and wheat yield and biomass of the sampling sites were monitored. Results show that yield and biomass of wheat was significantly and negatively related to soil salt content( p <0. 01),and the relationsip fitted a cubic equat...
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