中国生态农业学报2011，Vol.19Issue(4)：778-782,5.DOI:10.3724/SP.J.1011.2011.00778
咸水结冰灌溉结合改良剂对滨海盐土的改良作用
Effect of combined frozen saline water irrigation and soil amendment on coastal saline land reclamation
摘要
Abstract
Frozen saline water irrigation (FSWI) in winter is a kind of irrigation that utilizes natural cold conditions and abundant saline water. Natural melting of frozen brackish water separates salt from soil via salt water leaching that leaves behind fresh water, leading to saline soil desalinization. In accordance with water desalinization via freezing and thawing of saline water, a field experiment was conducted to study the principle of water and salt transfer following FSWI and soil amendment application. The results showed thai FSWI in winter reduced rhizosphere soil salinity. The amount of irrigation water was positively correlated with soil moisture. FSWI caused soil alkalization in initial stage of saline water ice melt, although this trend gradually weakened with ice melt under different treatments. Application of phosphogypsum decreased soil HCO, content, increased soil SO4 and Ca2+ contents, and effectively reduced ratios of Cl- and Na+ in total salt content. With increasing phosphogypsum application rate, rhizosphere soil pH decreased while soil water retention capacity increased (7 500 kghm-2 phosphogypsum > 4 500 kghm'2 phosphogypsum). High FSWI along with phosphogypsum application enhanced the growth of Chinese tamarisk. The best treatment combination was FSWI in winter at 1 350 m3-hm~2 saline water + 7 500 kghm-2 phosphogypsum. Combined FSWI and phosphogypsum application improved coastal saline land reclamation efficiency. It also amended soil alkalization induced by FSWI and provided favorable conditions for early seed germination and plants growth.关键词
滨海盐碱地/咸水结冰灌溉/磷石膏/土壤改良/柽柳Key words
Coastal saline land/ Frozen saline water irrigation/ Phosphogypsum/ Soil amendment/ Chinese tamarisk分类
农业科学引用本文复制引用
程文娟,潘洁,肖辉,陆文龙,王立艳..咸水结冰灌溉结合改良剂对滨海盐土的改良作用[J].中国生态农业学报,2011,19(4):778-782,5.基金项目
国家科技支撑计划项目(2009BADA3B04)资助 （2009BADA3B04）
