农业环境科学学报2012，Vol.31Issue(12)：2433-2440,8.
不同类型耐盐植物对盐碱土生物改良研究
Bio-reclamation of Different Halophytes on Saline-alkali Soil
摘要
Abstract
In order to investigate further effects and mechanisms of different halophytes growing in saline-alkali soil, and to promote the development and utilization of this kind of soil as a supplemental land resource, a saline-alkali soil was planted with three representative halo-phyte ( Tamwix ramosissima Ledeb. Festuca arundinacea Schreb, Helianthus annuus) monocultures in the north region of Yin Chuan City, Ningxia. Uncultivated soil was used as a control for comparison. The field experiment was conducted for 3 years (2008-2010) and soil chemical and physical properties, soil salt content and microbiological properties were analyzed. The bulk density of the surface soil (0～20 cm) decreased notably, and under Tamarix ramosissima Ledeb., Festuca arundinacea Schreb. and Helianthus annuus the bulk densities were 24.16%, 27.53% and 24.72% lower than the control, respectively. Planting these three kinds of halophytes increased the surface coverage, which could be shown to affect the soil by inhibiting salt movement to the soil surface in spring and enhancing salt leaching through the soil profile in autumn. Compared with the control, the initial soil infiltration rate under Tamarix ramosissima Ledeb., Festuca arundinacea Schreb. and Helianthus annuus increased by 9.96 times, 3.74 times and 1.49 times, respectively, and the stable soil infiltration rate increased by 5.33 times, 3.49 times and 1.65 times(i.e., in the same order). The total salt contents of the soil were reduced and soil fertility levels were effectively improved. The total salt content of surface soil under Tamarix ramosissima Ledeb., Festuca arundinacea Schreb. and Helianthus annuuk decreased by 86.4%, 71.5%, and 46.1%, respectively, and their organic matter contents increased by 73.7%, 38.2%, and 21.3%. Furthermore, the microbial environment of the soil was improved, which was indicated by increases in the microbial number of the soil surface (0～20 cm ) of 6.4 times, 5.5 times and 4.1 times that of the control, and similar increases in the microbial number of the 20～40 cm soil layer of 7.0 times, 6.6 times and 5.5 times that of the control. It was concluded that absorption of salt by the plants and migration of salt in the soil could increase the quality of the saline-alkali soil. Developing a halophyte-reclamation model, based on the biological effects of salt on halophytes, would be a new direction for research and a new idea for a tool that could be used for the development and utilization of saline-alkali soils.关键词
耐盐植物/盐碱土/生物改良/宁夏北部地区Key words
halophytes/ saline-alkali soil/ bio-reclamation/ the north part of Ningxia分类
农业科技引用本文复制引用
肖克飚,吴普特,雷金银,班乃荣..不同类型耐盐植物对盐碱土生物改良研究[J].农业环境科学学报,2012,31(12):2433-2440,8.基金项目
宁夏回族自治区自然基金项目(NZ0972) （NZ0972）
