Effect of Gypsum and Polyacrylamide Application on Erodibility of an Acid Kunigami Mahji Soil
Effect of Gypsum and Polyacrylamide Application on Erodibility of an Acid Kunigami Mahji Soil
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DOI：
10.1111/j.1747-0765.2005.tb00081.x
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发表时间：
2005-09
影响因子：
2
通讯作者：
T. Nishimura;Tahei Yamamoto;S. Suzuki;Makoto Kato
中科院分区：
文献类型：
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作者：
T. Nishimura;Tahei Yamamoto;S. Suzuki;Makoto Kato
碳酸钙和石膏常用于改善酸性土壤的化学状态。本研究探讨了石膏和聚丙烯酰胺（PAM）的应用对日本酸性土壤的入渗和可蚀性的影响。将来自冲绳的酸性Kunigami mahji土（沉积岩来源，Typic Hapludult）装入丙烯酸塑料盒中，施加40 mm h-1的模拟降雨。在降雨之前，将2.5 t ha−1石膏和/或15 kg ha−1非离子或阴离子PAM施用于土壤表面。在降雨过程中，定期收集地表径流，并测量径流的泥沙含量，pH值和电导率。石膏的施用增加了地表径流。降雨期间，径流EC大于麻吉土壤粘土的临界凝聚浓度，但施用石膏后土壤变得分散。施用PAM能促进石膏改良土的入渗，减少泥沙流失。
Calcium carbonates and gypsum are often used to improve the chemical status of acid soils. This study discusses the effects of gypsum and polyacrylamide (PAM) application on infiltration and erodibility of a Japanese acid soil. Acid Kunigami mahji soil (sedimentary rock derived, Typic Hapludult) from Okinawa was packed into an acrylic plastic box, and simulated rainfall of 40 mm h−1 was applied. Prior to the rainfall, 2.5 t ha−1 of gypsum and/or 15 kg ha−1 of non-ionic or anionic PAM were applied onto soil surface. During a rainfall, surface runoff was collected periodically, and sediment concentration, pH, and electric conductivity of the runoff were measured. Gypsum application enhanced surface runoff. During the rainfall, EC of the runoff was greater than the critical coagulation concentration of the clays of the mahji soil, however the soil became dispersive with gypsum application. PAM application could improve infiltration of gypsum amended mahji soil and reduce sediment loss.