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脱硫石膏与结构改良剂配合施用对龟裂碱土理化性状和水稻生长的影响
杜雅仙1, 黄菊莹2, 康扬眉1, 马凯博1, 余海龙1, 张俊华2
1.宁夏大学 资源环境学院, 宁夏 银川 750021;2.宁夏大学 环境工程研究院, 宁夏 银川 750021
摘要:
[目的]筛选出最适宜宁夏回族自治区银北灌区盐碱地水稻生长的土壤结构改良剂施用量,为中国同类型地区盐碱地的改良应用提供科学依据。[方法]设置田间定位试验,研究银北灌区龟裂碱土在施用不同剂量土壤结构改良剂(0,150,270,375 kg/hm2)与统一施用定量脱硫石膏(22.5 t/hm2)对土壤基本理化性质及水稻生长的影响。[结果]在施用不同剂量结构改良剂后,0—20 cm土层的土层容重、全盐量和pH值呈降低趋势,总孔隙度和水稳性团聚体则呈增加趋势。在0—20 cm土层,各处理改良效果均较显著,当深度大于40 cm时,所有处理的改良效果不明显。施加改良剂增加了水稻的成活率、株高和产量,且各处理间均差异显著(p<0.05)。[结论]脱硫石膏与结构改良剂配合施用能显著改善龟裂碱土理化性状,促进水稻成长。综合考虑经济因素,脱硫石膏(22.5 t/hm2)+土壤结构改良剂(270 kg/hm2)的施用量效果最佳。
关键词:  龟裂碱土  脱硫石膏  结构改良剂  改良  水稻
DOI:10.13961/j.cnki.stbctb.20180920.001
分类号:S156.4;S511
基金项目:国家自然科学基金项目“干湿交替灌溉模式下灌淤土裂隙特征及其对优先流的影响”(41561060)
Effect of Desulfurized Gypsum and Structure Amendment Application on Soil Physical and Chemical Properties of Takyr Solonetz Soil and Rice Growth
DU Yaxian1, HUANG Juying2, KANG Yangmei1, MA Kaibo1, YU Hailong1, ZHANG Junhua2
1.College of Recourses and Environment, Ningxia University, Yinchuan, Ningxia 750021, China;2.Institute of Environmental Engineering, Ningxia University, Yinchuan, Ningxia 750021, China
Abstract:
[Objective] To selecte the optimal application amount of soil structure amendment for the growth of rice in saline alkali land in the Yinbei irrigated area of Ningxia Hui Autonomous Region, in order to provide scientific basis for the improvement and application of saline alkali land of the same type in China.[Methods] A field experiment was conducted in Yinbei irrigation region in 2016. Different application rate of soil structure amendment (0, 150, 270 and 375 kg/hm2) with uniform desulfurized gypsum application rate (22.5 t/hm2) were used in the experiment.[Results] With the application of desulfurized gypsum and structure amendments, the pH value, total salt content and bulk density at 0-20 cm soil layer showed a decreasing trend, while the total soil porosity and water-stable aggregate content showed an increasing trend. The improvement effect was better at 0-20 cm layer, but the effect was not obvious below the depth of 40 cm. Application of the amendment increased the survival rate, plant height and yield of rice, and there were significant differences between treatments (p<0.05).[Conclusion] The application of desulfurized gypsum and structure amendment can significantly improve the physical and chemical properties of the takyr solonetz soil and promote the growth of rice. Considering the economic factors, the optimal soil structure amendment rate was 270 kg/hm2 and the optimal desulfurized gypsum application amount was 22.5 t/hm2.
Key words:  takyr solonetz soil  desulfurized gypsum  structure amendment  reclamation  rice