Environmental filtering controls soil biodiversity in wet tropical ecosystems

作者：Haiying Cui, Peter M. Vitousek, Sasha C. Reed, Wei Sun, Blessing Sokoya, Adebola R. Bamigboye, Jay Prakash Verma, Arpan Mukherjee, Gabriel F. Peñaloza‐Bojacá, Alberto L. Teixido, Pankaj Trivedi, Ji‐Zheng He, Hang‐Wei Hu, Kenny Png, Manuel Delgado‐Baquerizo · 发表于：Soil Biology and Biochemistry · 年份：2022 · DOI：10.1016/j.soilbio.2022.108571 · 被引用次数：9 · 研究领域：Soil Carbon and Nitrogen Dynamics、Peatlands and Wetlands Ecology、Soil and Water Nutrient Dynamics

The environmental factors controlling soil biodiversity along resource gradients remain poorly understood in wet tropical ecosystems. Aboveground biodiversity is expected to be driven by changes in nutrient availability in these ecosystems, however, much less is known about the importance of nutrient availability in driving soil biodiversity. Here, we combined a cross-continental soil survey across tropical regions with a three decades' field experiment adding nitrogen (N) and phosphorus (P) (100 kg N ha−1y−1 and 100 kg P ha−1y−1) to Hawai'ian tropical forests with contrasting substrate ages (300 and 4,100,000 years) to investigate the influence of nutrient availability to explain the biodiversity of soil bacteria, fungi, protists, invertebrates and key functional genes. We found that soil biodiversity was driven by soil acidification during long-term pedogenesis and across environmental gradients, rather than by nutrient limitations. In fact, our results showed that experimental N additions caused substantial acidification in soils from Hawai'i. These declines in pH were related to large decreases in soil biodiversity from tropical ecosystems in four continents. Moreover, the microbial activity did not change in response to long-term N and P additions. We concluded that environmental filtering drives the biodiversity of multiple soil organisms, and that the acidification effects associated with N additions can further create substantial undesired net negative effects on over...