施用脱硫石膏对稻田碱土和排水中可溶性盐分的影响  

Effects of desulfurized gypsum application on soluble salt in sodic soil and drainage water under rice cultivation

作　　者：王云贺[1,2] 王志春[1,3] 杨帆[1,3] 安丰华[1,3] 杨洪涛[1,2] 鲍达[1,3] 

机构地区：[1]中国科学院东北地理与农业生态研究所,吉林长春130102 [2]吉林农业大学中药材学院,吉林长春130118 [3]大安碱地生态实验站,吉林大安131317

出　　处：《华南农业大学学报》2014年第6期113-116,共4页Journal of South China Agricultural University

基　　金：中国科学院西部行动计划三期(KZCX2-XB3-16);公益性行业(农业)科研专项经费项目(200903001-06);国家科技支撑计划(2009BADB3B03);国家自然科学基金(31301233)

摘　　要：【目的】探讨不同脱硫石膏施用量对稻田碱土和排水中可溶性盐分的影响．【方法】通过田间试验，研究了脱硫石膏3个施用量29.17、16.68和4．17 t· hm-2（分别记为S1、S2、S3）对水田排水中可溶性盐分浓度的影响和苏打碱土的改良效果．【结果和结论】除碳酸根外，水稻分蘖期后水田排水中可溶性盐分的浓度趋于稳定，pH、电导率和残余碳酸钠含量（ RSC）基本不变；0～20 cm耕层土壤电导率随着石膏施入量的增加而升高，S1和S2处理10～20 cm土壤的电导率存在显著差异（P＜0.05），pH和钠吸附比（SAR）则呈相反的变化趋势；0～40 cm 土壤S1处理的脱盐效果好于S2和S3处理．[Objective] To explore the effects of desulfurized gypsum application on soluble salt in sodic soil and drainage water in paddy field .[Method] A field experiment with three different application rates of desulfurized gypsum [29.17（S1）,16.68（S2） and 4.17（S3）t· hm -2]was carried out to assess the improvement effect of sodic soil and soluble salt ions concentration .[Result and conclusion] The results showed that the soluble salt ions concentration except for carbonate in drainage water remained constant after rice tillering rear, and pH, electrical conductivity （EC） and residual sodium carbonate （RSC） in drainage water basically stayed unchanged .Differences in soil EC between S 1 and S2 treatments were sta-tistically significant at 10-20 cm soil depth （ P〈0.05 ）;soil EC increased with the increase of desulfu-rized gypsum application rates at 0-20 cm soil depth , however , the opposite trends were found for soil pH and sodium adsorption ratio （SAR）.Improvement effects of S1 treatment on sodic soil were better than those of S2 and S3 treatments for 0 to 40 cm soil depth .

关 键 词：钠吸附比 残余碳酸钠 苏打碱土 可溶性盐分 稻田 

分 类 号：S156.4[农业科学—土壤学]