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“泡沫砂”改良黏重黄壤孔隙结构的粒径效应
孙益权1, 王美艳1, 张 龙2, 陈 雪2, 张忠启3, 史学正1, 徐胜祥1, 孙维侠1, 班国军2, 夏中文2
1.土壤与农业可持续发展国家重点试验室(中国科学院南京土壤研究所);2.贵州省烟草公司毕节市公司;3.江苏师范大学地理测绘与城乡规划学院
摘要:
以贵州毕节黏重的黄壤为研究对象,通过掺入等量不同粒径的泡沫砂进行温室模拟试验,泡沫砂粒径分别为0.5 ? 2 mm(1T)、2 ? 7 mm(2T)和7 ? 10 mm(3T),研究孔隙特征改良的粒径效应。研究表明:与CK相比,添加3种粒径泡沫砂的处理均增加了土壤的通气孔隙,但在同等添加比例下,随着泡沫砂粒径的增大,土壤通气孔隙度也随之增加,1T、2T和3T处理相较于CK处理分别增加了4.68%、7.39% 和14.5%;不同粒径泡沫砂对不同当量孔径的孔隙影响不同,1T、2T和3T处理分别显著提升了当量孔径200 ? 500、1 000 ? 2 000、>2 000 μm的孔隙;不同处理均很好地提升了土壤孔隙连通度,但不同处理之间无显著差异。2T处理在改良土壤总孔隙和容重方面,与3T处理一同并为较优处理;在改良土壤通气孔隙度方面,2T处理的土壤通气孔隙度达到农业生产上最适宜区间,为最优处理;在改良分级孔隙配比方面,2T处理为次优处理。因此,从土壤通气孔隙、土壤分级孔隙和土壤孔隙形态等多角度考虑,2 ? 7 mm粒径泡沫砂可作为黏重土壤改良的最佳材料。
关键词:  泡沫砂  黄壤  粒径效应  孔隙结构
DOI:10.13758/j.cnki.tr.2020.03.025
分类号:S156.2
基金项目:贵州省烟草公司毕节市公司科技专项(毕节合2015-02,省市院合2015-06)和中国烟草总公司贵州省公司科技项目(合同号201703)资助。
Particle Size Effects of “Foam Sand” on Improving Pore Structure of Clayey Yellow Soil
SUN Yiquan1, WANG Meiyan1, ZHANG Long2, CHEN Xue2, ZHANG Zhongqi3, SHI Xuezheng1, XU Shengxiang1, SUN Weixia1, BAN Guojun2, XIA Zhongwen2
1.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences;2.Bijie Branch Company, Guizhou Tobacco Company;3.School of Geography, Geomatics and Planning, Jiangsu Normal University
Abstract:
Yellow soil in Bijie of Guizhou was taken as the research object, and simulation test in the greenhouse was carried out to study the effect of foam sand on pore structure by incorporating equal amount of foam sands with different diameters, which include 0.5-2 mm (1T treatment), 2-7 mm (2T treatment) and 7-10 mm (3T treatment). The results showed that soil aeration porosity increased with the increase of diameter of the foam sand under the same ratio of addition, compared with CK (without foam sand), 1T, 2T and 3T treatments increased soil aeration porosity by 4.68%, 7.39% and 14.5%, respectively. Foam sands with different diameters had different effects on pores with different equivalent diameters, 1T, 2T, and 3T treatments increased porosities with 200-500 μm, 1 000-2 000 μm and >2 000 μm in diameters, respectively. Foam sands improved pore connectivity compared with CK, but no significant difference was found among 1T, 2T and 3T treatments. 2T and 3T treatments improved soil bulk density and total porosity most, and 2T treatment improved the proportion of soil aeration porosity the second most. Therefore, from the perspectives of aeration pores, soil porosity proportions and pore morphology, foam sand with 2-7 mm diameter is best in improving clayey yellow soil.
Key words:  Foam sand  Yellow soil  Particle size effect  Pore structure

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