Nitrogen addition reduced carbon mineralization of aggregates in forest soils but enhanced in paddy soils in South China

文献类型： 外文期刊

第一作者： Cao, Ruirui

作者： Cao, Ruirui;Li, Haimei;Chen, Longchi;Lu, Xiaotao;Chen, Longchi;Hou, Xincun

作者机构：

关键词： Ultisol; Land use type; Microaggregates; Soil organic carbon

期刊名称：ECOLOGICAL PROCESSES （ 影响因子：2.849； ）

ISSN：

年卷期： 2021 年 10 卷 1 期

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收录情况： SCI

摘要： Background Despite the crucial role of nitrogen (N) availability in carbon (C) cycling in terrestrial ecosystems, soil organic C (SOC) mineralization in different sizes of soil aggregates under various land use types and their responses to N addition is not well understood. To investigate the responses of soil C mineralization in different sized aggregates and land use types to N addition, an incubation experiment was conducted with three aggregate-size classes (2000, 250, and 53 mu m) and two land use types (a Chinese fir plantation and a paddy land). Results Cumulative C mineralization of the < 53-mu m fractions was the highest and that of microaggregates was the lowest in both forest and paddy soils, indicating that soil aggregates enhanced soil C stability and reduced the loss of soil C. Cumulative C mineralization in all sizes of aggregates treated with N addition decreased in forest soils, but that in microaggregates and the < 53-mu m fraction increased in paddy soils treated with 100 mu g N g(-1). Moreover, the effect sizes of N addition on C mineralization of forest soils were below zero, but those of paddy soils were above zero. These data indicated that N addition decreased SOC mineralization of forest soils but increased that of paddy soils. Conclusions Soil aggregates play an important role in soil C sequestration, and decrease soil C loss through the increase of soil C stability, regardless of land use types. N addition has different effects on soil C mineralization in different land use types. These results highlight the importance of soil aggregates and land use types in the effects of N deposition on the global terrestrial ecosystem C cycle.

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