Abstract—

The specific features in accumulation and distribution of organic carbon and nitrogen in the aggregates of typical, ordinary, and southern chernozems (Protocalcic Chernozems, Endocalcic Chernozems, and Pantocalcic Chernozems, respectively) during the transition from conventional farming to a no-till system are evaluated. For this purpose, the contents of organic carbon and nitrogen were determined in different aggregate size fractions (>10, 10–2, 2–1, 1–0.25, and <0.25 mm). All three chernozem subtypes differ in the content of organic carbon in a statistically significant manner. The carbon content in all no-till chernozems is higher as compared with the control (conventionally tilled chernozems). The no-till and conventional variants display no statistically significant differences in the nitrogen content. However, the nitrogen content statistically significantly depends on the aggregate size in no-till variants in contrast to conventional farming. In Protocalcic Chernozems, the higher nitrogen content is observed in all agronomically valuable aggregate size fractions (10–0.25 mm); in Endocalcic Chernozems, in the fractions of 2–0.25 mm; and in Pantocalcic Chernozems, in the fractions of <0.25 mm and 2–1 mm. In addition, characteristic of no-till Endocalcic Chernozem is the dependence of carbon content on the aggregate size. The use of no-till system significantly changes the transformation patterns of soil organic matter and biological activity in chernozems.

中文翻译：

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免耕系统对原钙，内钙和泛钙黑钙土中总大小分数的有机碳和氮分布的影响

摘要-

评价了从常规耕作到免耕系统过渡过程中典型，普通和南部的黑钙石（分别为原钙黑钙石，内钙黑钙石和泛钙黑钙石）的聚集体中有机碳和氮的积累和分布的特定特征。 。为此，以不同的总尺寸分数（> 10、10–2、2-1、1–0.25和<0.25 mm）确定有机碳和氮的含量。所有三种黑钙棉亚型的有机碳含量均以统计学上显着的方式不同。与对照品（传统耕作的黑钙土）相比，所有免耕黑钙土的碳含量都更高。免耕和常规变种在氮含量上没有统计学上的显着差异。然而，与常规耕作相比，氮含量在统计学上显着取决于免耕品种的总大小。在原钙质黑钙石中，在所有具有农学价值的骨料颗粒级分（10-0.25 mm）中均观察到较高的氮含量。在钙结钙质黑钙石中，分数为2–0.25毫米；在全钙黑钙石中，分数分别小于0.25 mm和2-1 mm。此外，免耕型内钙黑钙土的特征是碳含量对骨料尺寸的依赖性。免耕系统的使用显着改变了黑钙土中土壤有机质和生物活性的转化方式。在所有具有农学价值的骨料中，较高的氮含量（10-0.25 mm）；在钙结钙质黑钙石中，分数为2–0.25毫米；在全钙黑钙石中，分数分别小于0.25 mm和2-1 mm。此外，免耕型内钙黑钙土的特征是碳含量对骨料尺寸的依赖性。免耕系统的使用显着改变了黑钙土中土壤有机质和生物活性的转化方式。在所有具有农学价值的骨料中，较高的氮含量（10-0.25 mm）；在钙结钙质黑钙石中，分数为2–0.25毫米；在全钙黑钙石中，分数分别小于0.25 mm和2-1 mm。另外，免耕的内钙钙钙石的特征是碳含量对骨料尺寸的依赖性。免耕系统的使用显着改变了黑钙土中土壤有机质和生物活性的转化方式。