麦鱼套作改良滨海盐土的研究

从１９８８年开始，进行沿海滩涂盐土大面积以囤蓄雨水为主，回龙水灌溉辅的养鱼改良强度盐渍化土的试验，当其含盐量降至一定的数值后，脱盐速率明显下降。在此基础上，从１９９０年开始，又建立了麦鱼套作新的种养殖模式，并瑟其它中度以下盐渍土种植大麦的传统种植制度和目前的大面积蓄淡养鱼改土的利用方式进行比较试验。

STUDY ON RECLAMATION OF COASTAL SALINE SOIL WITH MIXED CULTURE OF FISH AND BARLEY

A strongly salined coastal soil was reclaimed by fish culture with accumulated rain water together with additional irrigation using slightly salined river water. The rate of salt leaching was distinctly decreased after the salt contents of the soils declined to certain values. Two years later, in the same soils, a new culture model of mixed culture of fish and barley (MC)¹⁾ was set up and compared with only barley culture (BC)²⁾ and with only fish culture (FC)³⁾ to exame the effect of saline soil reclamation. The results obtained in the following three years were as follows. 1.The maximum rate of salt leaching, the biggest decrease of Na⁺/Ca⁺⁺ and the distinct enrichment of Ca⁺⁺ in surface soil (0-20cm) were obtained in the soils of MC. 2. Better soil fertility indexes, such as soil physical and chemical properties, could also be found in the soils of MC. Thus, soil organic carbon of MC was 1.48 times that of BC, the ability of nitrogen supply was in the order of MC>BC>FC, and the biggest activity of soil urease was obtained in the soil of MC, which was closely related to the fertility of coastal saline soil.