关键词: 盐碱土改良, 台田-浅池, 海冰水, 排盐效率, 旱涝盐碱

Abstract: With the national concern for grain security, coastal salt wasteland of the improvement and utilization attracted attention again. Experiment shows: the comprehensive land use pattern of raised-land and shallow pond significantly reduced salt in coastal saline-alkali land. Desalinization efficiency is up to 47% on raised-land where was the silty saline-alkali land before in Huanghua city of Hebei Province. During the growing stage of oil-sunflower on raised-land, two times of sea ice water irrigations make the difference in soil desalinization efficiency. Taking sea ice water irrigation in July as a case, per square meter 0-120cm soil layers drained 2.70 kg of salt, compared with the salt wasteland the soil layer drained 6.15 kg of salt, and compared to no irrigation of raised land the soil layer drained 3.76 kg of salt. Generally, the raised land P_T was significantly higher than the sea ice water irrigation P_TW. Therefore, the raised land using in the coastal saline areas with drought saline field can control salt of micro plant area, with the sea ice water irrigation to protect the crop water requirement, it can build a safety environment for agricultural cultivation. This study offered the reference for coastal saline-alkali land and wasteland improvement, raised land-shallow pond utilization, construction of ecological agriculture and the safety irrigation of sea ice water.

Key words: saline-alkali land improvement, raised-land and shallow pond, sea ice water, desalinization contribution, drought and salinity