冀中南棉区土壤钠的形态与棉花吸收的关系

对河北省中南部棉区36个地块土壤钠形态和含量进行了测定。结果表明,冀中南棉田土壤020cm全钠含量为10.7～24.6g.kg;交换性钠含量为48～10250mg.kg,水溶性钠含量为21.5～10400.5mg.kg。土壤全钠含量与交换性钠含量、水溶性钠含量之间及土壤交换性钠含量与水溶性钠含量之间均呈正相关关系;土壤全钠含量与土壤有机质含量、土壤阳离子交换量之间呈负相关关系;土壤交换性钠含量、水溶性钠含量与土壤阳离子交换量之间呈负相关关系;水浇地棉田土壤全钠含量与水溶性钠含量之间呈负相关关系。从供试土壤全钠含量为14.1～17.6g.kg,交换性钠含量为39.0～189.0mg.kg,水溶性钠含量为19.5～114.0mg.kg条件下的盆栽试验结果看出,棉花苗期干物质积累量与土壤交换性钠含量、土壤水溶性钠含量之间以及棉花苗期钠吸收量与土壤交换性钠含量、水溶性钠含量之间均呈曲线相关关系。

Relationship between the forms of soil sodium and sodium absorbed by cotton in the south centre area of Hebei

The soil sodium forms and content of 36 samples were investigated in south centre area of Hebei. The results showed that the total sodium, exchangeable sodium and water-soluble sodium contents in the 0-20 cm soil layer were 10.7-24.6, 48-10250 and 21.5-10400.5 mg/kg respectively. The relationship between the total sodium with exchangeable sodium, water-soluble sodium and exchangeable sodium with water-soluble sodium in soil were positive correlation; and the total sodium with soil organic matter, soil ECE were negative, and the total sodium with soil water-soluble sodium in irrigated cotton was also negative. The pot experiment by using the investigated soils indicated that the relationship of dry matter accumulation of cotton at seedling with soil exchangeable sodium and soil water-soluble sodium; and soil sodium absorption rate with exchangeable sodium and water-soluble sodium of cotton plant at seedling stage were curvilinear correlation.