Post-farmland conversion spatio-temporal dynamics of net soil nitrogen mineralization and availability in a chronosequence of Zanthoxylum bungeanum plantations

文献类型： 外文期刊

第一作者： Saba, Tahseen

作者： Saba, Tahseen;Lv, Chen;Wang, Jingyan;Hui, Wenkai;Gong, Wei;Hassan, Waseem

作者机构：

关键词： farmland abandonment; land-use conversion; nitrogen mineralization; plant-available nitrogen; Zanthoxylum bungeanum

期刊名称：LAND DEGRADATION & DEVELOPMENT （ 影响因子：4.377； 五年影响因子：5.205 ）

ISSN： 1085-3278

年卷期： 2022 年 33 卷 15 期

页码：

收录情况： SCI

摘要： Afforestation on cultivated farmlands causes major shifts in the nitrogen (N) cycle. The consequences of large-scale Zanthoxylum bungeanum afforestation on spatio-temporal patterns of soil N mineralization and inorganic N (ION) availability have not been reported. Moreover, the regulatory roles of microbial biomass and soluble organic N (MBN and SON) in the N cycle are poorly characterized in soils below 20 cm. To investigate the long-term effects of afforestation on the governing mechanism of vertical N dynamics, a 0-100 cm soil profile was collected from a chronosequence of Z. bungeanum plantations aged 8-year (H8), 15-year (H15), 20-year (H20) and 28-year (H28), as well as adjacent farmland and abandoned-land (28-year) as controls in an arid valley in Southwest China. With increasing stand age, conversion of farmland to Z. bungeanum plantations significantly improved soil organic carbon, available nutrients, and all N forms. These impacts were more evident in the topsoil (0-20 cm) than in the subsoil layers. MBN and SON contents improved by 1.42-fold and 1.34-fold in H28, respectively, compared to H8. Net N mineralization (1.31-fold), net nitrification rates (1.30-fold), and total ION (1.31-fold) content followed similar trends of increase along with the stand age. Correlation and redundancy analysis also established a positive relationship and demonstrated that increased ION availability is due to improved MBN, SON, and urease activity with the plantations age. Although the nitrate-N content was highest in abandoned-land, its content also increased steadily in Z. bungeanum plantations with the stand age. A relatively low ammonium/nitrate ratio (0.331) in H28 advocated improved N supply via nitrification as well as low N leaching risks from plantations. The spatial investigation provided novel insights into controls of N cycle and suggested converting farmland to Z. bungeanum plantations is a suitable approach for restoring soil N.

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