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Contents of Organic Carbon and Nitrogen in Particle-Size Fractions of Aggregates of Typical Chernozems (Protocalcic Chernozems)
Eurasian Soil Science ( IF 1.4 ) Pub Date : 2021-04-20 , DOI: 10.1134/s1064229321030078
V. A. Kholodov , N. V. Yaroslavtseva , M. A. Yashin , Yu. R. Farkhodov , B. S. Ilyin , V. I. Lazarev

Abstract

Specific features in the content and accumulation of organic carbon and nitrogen in the aggregates of typical chernozems (Protocalcic Chernozems) of long-term experimental plots with different land management systems are assessed. The size fractions in the aggregates of >10, 10–3, 2–1, 1–0.25, and <0.25 mm are examined. The carbon and nitrogen contents are shown to depend on the land management system in a statistically significant manner. The dependence of carbon content on the size of aggregates is observed in five land use systems of the seven examined ones (permanent tilled fallow, unmanaged fallow after permanent tilled fallow, permanent corn and potato fields, shelterbelt, and annually mown steppe). As for nitrogen content, such pattern is observed in three land use variants. The specific features in carbon and nitrogen contents in the size fractions of soil aggregates depend on the type of land use. The carbon content under herbaceous vegetation (steppe) increases with a decrease in the size of aggregates reaching its maximum in the fraction of 1–0.25 mm. As for tree stands (shelterbelt), the maximum carbon content is observed in the fractions of >10 and <0.25 mm. All aggregates <2 mm of the chernozem under herbaceous vegetation in the process of restoration contain considerably higher amount of carbon as compared with the coarser fractions. The nitrogen content in the size fractions of the soil of steppe and shelterbelt plots follows the patterns similar to those of the carbon content.



中文翻译:

典型黑钙石(原钙黑钙石)聚集体粒度级分中有机碳和氮的含量

摘要

评估了具有不同土地管理系统的长期实验区典型黑钙石(原钙黑钙石)聚集体中有机碳和氮的含量和累积的特定特征。检查聚集体中大于10、10-3、2-1、1-0.25和<0.25毫米的尺寸分数。碳和氮含量以统计学上显着的方式显示取决于土地管理系统。在七个被调查的土地使用系统中,有五个观察到了碳含量与集料大小的相关性(永久耕种休耕,永久耕种休耕后无管理的休耕,永久玉米和马铃薯田地,防护林带和每年割下的草原)。至于氮含量,在三种土地利用变体中都观察到了这种模式。土壤团聚体中碳和氮含量的具体特征取决于土地利用的类型。草本植物(草原)下的碳含量随着团聚体尺寸的减小而增加,最大达到1-0.25 mm。至于林木(防护林),最大碳含量以> 10和<0.25 mm的比例观察到。在恢复过程中,在草木植被下所有小于2mm的黑钙石的骨料中所含的碳量均比粗颗粒中的高得多。草原和防护林地块土壤中的氮含量遵循与碳含量相似的模式。草本植物(草原)下的碳含量随着团聚体尺寸的减小而增加,最大达到1-0.25 mm。至于林木(防护林),最大碳含量以> 10和<0.25 mm的比例观察到。在恢复过程中,在草木植被下所有小于2mm的黑钙石的骨料中所含的碳量均比粗颗粒中的高得多。草原和防护林地块土壤中的氮含量遵循与碳含量相似的模式。草本植物(草原)下的碳含量随着团聚体尺寸的减小而增加,最大达到1-0.25 mm。至于林木(防护林),最大碳含量以> 10和<0.25 mm的比例观察到。在恢复过程中,在草木植被下所有小于2mm的黑钙石的骨料中所含的碳量均比粗颗粒中的高得多。草原和防护林地块土壤中的氮含量遵循与碳含量相似的模式。与较粗糙的部分相比,在草木植被恢复过程中,2毫米的黑钙质碳含量要高得多。草原和防护林地块土壤中的氮含量遵循与碳含量相似的模式。与较粗糙的部分相比,在草木植被恢复过程中,2毫米的黑钙质碳含量要高得多。草原和防护林地块土壤中的氮含量遵循与碳含量相似的模式。

更新日期:2021-04-20
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