{"title":"Organic Matter of the Water-stable Structural Unites of Haplic Chernozem in Contrasting Variants of Land Use (Steppe vs. bare Fallow)","authors":"","doi":"10.3103/s0147687423060017","DOIUrl":null,"url":null,"abstract":"<span> <h3>Abstract</h3> <p>The organic matter of water-stable macro- (2–1 mm) and free microaggregates (<0.25 mm) isolated from the 2–1 mm air-dry macroaggregates of Haplic Chernozem in the contrasting land use variants was studied by granulo-desitometric fractionation. It was revealed that water-stable free microaggregates are only parts of disintegrated macroaggregates. The composition of microaggregates unstable under the sonication (mWSA) within structural units of different sizes (macro- (WSA<sub>ma</sub>) and microaggregates (WSA<sub>mi</sub>)) has been studied in detail. The composition of mWSA within WSA of different size is completely identical; they differ only in size, quantity, and packing density. Within WSA<sub>mi</sub>, the size and quantity of mWSA are by 1.7- and 1130-fold smaller than those within WSA<sub>ma</sub>. The packing density of mWSA<sub>ma</sub> is 1.5-fold less than that of mWSA<sub>mi</sub>.</p> </span>","PeriodicalId":501690,"journal":{"name":"Moscow University Soil Science Bulletin","volume":"22 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Moscow University Soil Science Bulletin","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3103/s0147687423060017","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The organic matter of water-stable macro- (2–1 mm) and free microaggregates (<0.25 mm) isolated from the 2–1 mm air-dry macroaggregates of Haplic Chernozem in the contrasting land use variants was studied by granulo-desitometric fractionation. It was revealed that water-stable free microaggregates are only parts of disintegrated macroaggregates. The composition of microaggregates unstable under the sonication (mWSA) within structural units of different sizes (macro- (WSAma) and microaggregates (WSAmi)) has been studied in detail. The composition of mWSA within WSA of different size is completely identical; they differ only in size, quantity, and packing density. Within WSAmi, the size and quantity of mWSA are by 1.7- and 1130-fold smaller than those within WSAma. The packing density of mWSAma is 1.5-fold less than that of mWSAmi.
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