文献类型： 外文期刊

作者： Sun, Feng ¹ ; Yan, Guanzhao ¹ ; Lin, Wei ¹ ; He, Wei ¹ ; Cheng, Xianli ² ; Li, Yingwen ² ; Tariq, Akash ³ ; Sardans, Jordi ⁴ ; Penuelas, Josep ⁴ ; Wang, Jinchuang ⁶ ; Wang, Mei ⁷ ; Li, Yuelin ² ; Peng, Changlian ¹ ;

作者机构： 1.South China Normal Univ, Sch Life Sci, Guangzhou Key Lab Subtrop Biodivers & Biomonitorin, Guangdong Prov Key Lab Biotechnol Plant Dev, Guangzhou 510631, Peoples R China

2.Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Eco, South China Bot Garden, Guangzhou, Peoples R China

3.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China

4.UAB, CSIC, Global Ecol Unit, CREAF CSIC, Barcelona 08193, Spain

5.CREAF, Barcelona 08193, Spain

6.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou, Hainan, Peoples R China

7.South China Normal Univ, Sch Geog Sci, Guangzhou 510631, Peoples R China

关键词： Tropical forests; Warming; Potassium mineralization; Microbial and nematode community; Microbial-nematode interaction

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 243 卷

页码：

收录情况： SCI

摘要： Potassium (K) cycling in forest systems has received less attention than nitrogen (N) and phosphorus (P) cycles, despite its critical role in maintaining primary production and regulating water economy and use under climate warming. This study conducted a 10 -year study in which we translocated dominant tropical forest tree seedlings and underlying soil (i.e., in situ soil) from high -altitude sites (600 m a.s.l.) to lower altitude sites at 300 m a.s.l. (+1.0 degrees C) and 30 m a.s.l. (+2.1 degrees C) to simulate climate warming in southern China. We investigated soil microbial and nematode communities, soil and foliar K concentrations at the aggregate level, and tree growth under different altitude sites. Microbial community was characterized by high -throughput sequencing, nematodes were identified to the genus level using microscope. The findings revealed that warming treatments significantly (p < 0.01) increased soil fungal gene abundance (+78 % at 300 m and +62 % at 30 m), fungal/bacterial abundance ratio (+121 % at 300 m and +101 % at 30 m), and soil fungivore abundance (+274 % at 300 m and +233 % at 30 m). These results indicate a shift in the soil decomposition pathway from bacterial to fungal -based channels. In addition, warming amplifies the interactions between fungi and fungivores. Aggregates had few effects on microbial biomass, but had significant effect on nematode abundance. Soil microcosm experiments consistently demonstrated that addition of the dominant fungivore Aphelenchoides significantly (p < 0.05) enhanced soilexchangeable K by stimulating fungal gene abundance and activity. Furthermore, warming -induced changes in forest communities were observed. At the species -specific tree level, Syzygium rehderianum demonstrated the ability to take advantage of this scenario, exhibiting increased K uptake (-4% at 300 m and +32 % at 30 m). This may be attributed to the species being ectomycorrhizal-forming, where colonizing root surfaces can mobilize interlayer and structural K from the minerals. In contrast, Machilus breviflora exhibited lower foliar K concentrations (-42 % at 300 m and -41 % at 30 m) and reduced growth. However, warming had little effect on Schima superba , Myrsine seguinii , Itea chinensis , and Ardisia lindleyana growth. Warming -induced changes in the plant-soil system K cycle highlight the emergence of a new ecosystem structure with different soil web structures and distinct plant community species composition. Our results prompt further research to understand the microbiome-mediated complexities of understudied nutrient cycles, which are likely to be further altered in the future owing to climate change.