{"title":"有机废物改性土壤结构团聚体的一些物理性质","authors":"J.S.C. Mbagwu, A. Piccolo","doi":"10.1016/0269-7483(90)90151-H","DOIUrl":null,"url":null,"abstract":"<div><p>Surface (0–20 cm) samples from five soils amended with pig slurry, sewage sludge or cattle slurry were separated into four macro- and three micro-aggregate fractions by dry sieving. Relative to the controls, these amendments decreased the apparent density and dispersibility of the aggregates, increased slightly their water-retention capacity at —0·03 MPa tension, but had no significant effect on intra-porosity and particle-size distribution of the aggregates. On average, pig slurry reduced aggregate dispersibility by 34% in the sandy loam and 8% in the sandy clay loam Modena soils. Sewage sludge and cattle slurry reduced dispersibility by 41% and 26%, respectively, in the sandy loam Lamporecchio and sandy clay loam Cremona soils. The organic carbon contents of the aggregates accounted for 73–98% of variability in their tendency to disperse, whereas their silt plus clay contents accounted for 38–96% of variability in the moisture they retained at —0·03 MPa tension.</p></div>","PeriodicalId":100177,"journal":{"name":"Biological Wastes","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0269-7483(90)90151-H","citationCount":"16","resultStr":"{\"title\":\"Some physical properties of structural aggregates separated from organic waste-amended soils\",\"authors\":\"J.S.C. Mbagwu, A. Piccolo\",\"doi\":\"10.1016/0269-7483(90)90151-H\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Surface (0–20 cm) samples from five soils amended with pig slurry, sewage sludge or cattle slurry were separated into four macro- and three micro-aggregate fractions by dry sieving. Relative to the controls, these amendments decreased the apparent density and dispersibility of the aggregates, increased slightly their water-retention capacity at —0·03 MPa tension, but had no significant effect on intra-porosity and particle-size distribution of the aggregates. On average, pig slurry reduced aggregate dispersibility by 34% in the sandy loam and 8% in the sandy clay loam Modena soils. Sewage sludge and cattle slurry reduced dispersibility by 41% and 26%, respectively, in the sandy loam Lamporecchio and sandy clay loam Cremona soils. The organic carbon contents of the aggregates accounted for 73–98% of variability in their tendency to disperse, whereas their silt plus clay contents accounted for 38–96% of variability in the moisture they retained at —0·03 MPa tension.</p></div>\",\"PeriodicalId\":100177,\"journal\":{\"name\":\"Biological Wastes\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1990-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0269-7483(90)90151-H\",\"citationCount\":\"16\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Biological Wastes\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/026974839090151H\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Biological Wastes","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/026974839090151H","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Some physical properties of structural aggregates separated from organic waste-amended soils
Surface (0–20 cm) samples from five soils amended with pig slurry, sewage sludge or cattle slurry were separated into four macro- and three micro-aggregate fractions by dry sieving. Relative to the controls, these amendments decreased the apparent density and dispersibility of the aggregates, increased slightly their water-retention capacity at —0·03 MPa tension, but had no significant effect on intra-porosity and particle-size distribution of the aggregates. On average, pig slurry reduced aggregate dispersibility by 34% in the sandy loam and 8% in the sandy clay loam Modena soils. Sewage sludge and cattle slurry reduced dispersibility by 41% and 26%, respectively, in the sandy loam Lamporecchio and sandy clay loam Cremona soils. The organic carbon contents of the aggregates accounted for 73–98% of variability in their tendency to disperse, whereas their silt plus clay contents accounted for 38–96% of variability in the moisture they retained at —0·03 MPa tension.