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Karst rocky desertification restoration increases soil inorganic N supply to reduce plant N limitation

文献类型： 外文期刊

作者： Wen, Dongni 1 ; Huang, Yuanyuan 2 ; Huang, Yuanfei 1 ; Ding, Nana 1 ; Ni, Kang 4 ; Wang, Hua 3 ; Elrys, Ahmed S. 1 ; Meng, Lei 1 ; Zhu, Tongbin 3 ; Gessert, Alena 5 ; Mueller, Christoph 6 ;

作者机构： 1.Hainan Univ, Sch Trop Agr & Forestry, Haikou 570100, Peoples R China

2.Hainan Normal Univ, Sch Geog & Environm Sci, Haikou 570100, Peoples R China

3.Chinese Acad Geol Sci, Key Lab Karst Dynam, MLR & Guangxi, Inst Karst Geol, Guilin 541004, Peoples R China

4.Chinese Acad Agr Sci, Tea Res Inst, Hangzhou 310008, Peoples R China

5.Pavol Jozef Safarik Univ, Inst Geog, Kosice 204180, Slovakia

6.Justus Liebig Univ, Liebig Ctr Agroecol & Climate Impact Res, Giessen, Germany

7.Justus Liebig Univ Giessen, Inst Plant Ecol, Heinrich Buff Ring 26, D-35392 Giessen, Germany

8.Univ Coll Dublin, Sch Biol & Environm Sci, Belfield, Dublin, Ireland

9.Univ Coll Dublin, Earth Sci Ctr, Belfield, Dublin, Ireland

关键词： Rocky desertification; Nitrogen availability; Plant N limitation; Gross N transformation rates; Soil microbial community

期刊名称：CATENA （ 影响因子：5.4； 五年影响因子：5.9 ）

ISSN： 0341-8162

年卷期： 2024 年 241 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) limitation of plant growth following vegetation restoration is widespread in global terrestrial ecosystems, especially in karst rocky desertification areas. However, neither the temporal changes in plant N limitation during the restoration of those areas nor the mechanisms underlying N availability are well understood. In this study, several indicators reflecting soil N availability, N transformation rates, and plant communities were investigated in four areas in southwest China differing in their grade of rocky desertification. Our results showed that plant growth was severely N limited in the intense rocky desertification areas. The plant community-level foliar N content, N-15 values, and N:P ratio increased significantly as the rocky desertification grade decreased, indicating a decrease in plant N limitation. This was attributed to increased soil N availability, evidenced by the higher soil delta N-15 values as well as total N and inorganic N contents along the rocky desertification grade. With the decreasing rocky desertification grade, the rates of organic N conversion to ammonium (NH4+) and nitrate (NO3-), the adsorption of NH4+ on cation-exchange sites, and the release of adsorbed NH4+ increased significantly, which could enhance soil inorganic N supply capacity and accelerate NH4+ turnover to increase N availability. Noticeably, the sharp decrease in the rate of NH4+ oxidation to NO3- with the decrease in the rocky desertification grade led to a shift in inorganic N from NO3--dominated to NH4+-dominated. The increased contents of soil organic matter, calcium, iron-aluminum oxides, and sand, the proportion of aggregates > 2 mm, as well as the greater abundances of fungi and bacteria were the primary drivers of the N transformation rates along the rocky desertification grade. Overall, our study highlights the importance of N cycling in controlling N availability and thus in determining plant N limitation in karst rocky desertification areas. The results of the study provide a scientific basis for the ecological restoration of rocky desertification in karst ecosystems.

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