滨海盐碱土隔离层条件下水盐不均匀分布及作物响应规律

The reclamation of tidal flat resources along coastal line could provide Jiangsu province with a lot of agricultural field. The technology of setting isolation layer in the coastal saline soil is an effective method to prevent the salt accumulation on the soil surface by capillary action as well as increasing the infiltration rate in the salinity soil. Whereas, how to decide the proper depth of isolation layer in salinity soil has been an urgent problem to deal with nowadays The effects of vertically unequal salt distribution in rootzone caused by isolation layer on growth, physiological responses, yield and quality of crop was focused in this project. Meanwhile the mechanism of crop responses to unequal salt distribution in rootzone is also be clarified in this research. Based on the compensation effects by unequal salt distribution in rootzone, finding the properly proportion of root zone under salt stress is crucial to get the reasonable burial depth of isolation layer in coastal saline as well as providing theoretical supports for drainage in that area.

江苏滩涂资源丰富，科学的改造和利用沿海滩涂，有利于解决日益短缺的耕地资源问题。通过在滨海盐碱土中设置秸秆隔离层,可起到破环土壤毛管作用，阻止土壤表层返盐、增加水分入渗的作用，已成为土壤脱盐、控盐技术研究的一个重要方向。本项目通过研究不同隔离层处理造成的水盐不均匀分布的情况，探索根区土壤盐分的不均匀分布对根系分布、生长发育指标、生理（化）指标、以及产量和品质的影响规律，阐明根区盐分不均匀分布对植物产生胁迫的机理。基于部分根系受到盐分胁迫能够产生有益补偿效应的机理，确定作物适宜的受盐分胁迫的根系占总根系的比例，为率定出滨海盐碱地特定作物隔离层的合理埋设深度，以及更科学提出地下水临界深度等排水指标提供数据和理论支持。

江苏滩涂资源丰富，科学的改造和利用沿海滩涂，有利于解决日益短缺的耕地资源问题。本项目研究了不同隔离层处理以及地下水深对水盐不均匀分布的影响，以及根区土壤盐分的垂直不均匀分布对作物根系分布 、作物生长、生理（化）指标、产量和品质的影响规律，初步率定出滨海盐碱地特定作物隔离层的合理埋设深度以及不同根区的适宜盐分含量，可为更科学开发滨海盐碱地资源提供数据支撑和技术支持。本项目执行期间，在Scientia Horticulturae、农业工程学报、灌溉排水学报等国内外期刊上发表论文5篇，其中SCI收录1篇，EI收录1篇。在国内学术会议上做报告2次；培养博士研究生1名，硕士研究生2名，其中一人获得研究生国家奖学金。