滨海盐碱地棉田盐度等级划分

我国植棉区内的滨海盐碱地主要呈带状分布在山东、河北、天津和苏北沿海低平原海岸地区,滨海盐碱地已成为我国重要的棉田生态类型。为满足盐碱地棉花生产发展的需要,本研究在参考前人研究与实践的基础上,基于盐碱地棉田土壤盐分的季节性变化、土壤盐分对棉花出苗、成苗和产量的影响,以春季(3月中下旬)0～20 cm表层土壤全盐含量为指标,将滨海盐碱地棉田划分为脱盐非盐碱地(0.10%)、轻度盐碱地(0.10%～0.25%)、中度盐碱地(0.25%～0.45%)和重度盐碱地(0.45%～0.80%)。各类盐碱地应根据盐度等级采取针对性成苗和管理技术措施,才能实现全苗壮苗和丰产丰收。

Soil Salinity Grading of Cotton Field in Coastal Saline Area

Coastal saline soil within cotton cultivating areas in China is mainly distributed in the coastal low plain of Shandong,Hebei,Tianjin and north of Jiangsu Province.It has become one of the most important ecotypes of cotton field in China.On the basis of previous research and practice,the seasonal dynamics of soil salinity and its effect on cotton emergence,seedling establishment and lint yield were analyzed.To meet the demand of developing cotton production,the saline cotton fields were divided into four grades according to the total salt content in soil of 0~20 cm in spring(the middle and later ten days of March).They were desalinized non-saline soil(<0.10%),low salinity(0.10%~0.25%),moderate salinity(0.25%~0.45%) and high salinity soil(0.45%~0.80%).It was suggested that each type of saline cotton field should adopt pertinent and appropriate technical measures to improve the seedling establishment and cotton yield.