Karst rocky desertification progress: Soil calcium as a possible driving force
Karst rocky desertification progress: Soil calcium as a possible driving force
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DOI：
10.1016/j.scitotenv.2018.08.242
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发表时间：
2019-02-01
影响因子：
9.8
通讯作者：
Ji, ZhiLiang
中科院分区：
文献类型：
--
作者：
Tang, Jing;Tang, XiaoXin;Ji, ZhiLiang
喀斯特石漠化是一种严重的不可逆转的生态系统破坏。喀斯特生态系统非常脆弱，易受环境变化的影响，退化为石漠化。以往的研究揭示了喀斯特生态系统中土壤细菌群落、土壤性质和地上植被覆盖之间的潜在联系。然而，这三个因素如何相互影响，共同推动喀斯特石漠化的进程，在很大程度上是未知的。为了回答这个问题，我们监测了土壤中的细菌群落的变化，从多个地点在连续喀斯特石漠化地区的16 S rRNA V3-V4区测序。总体而言，我们在岩溶土壤中检测到34个细菌门，其中变形菌门，放线菌门和酸细菌门是最丰富的。通过对细菌群落-植被-土壤性质-植被相互作用的网络分析，筛选出6个与植被退化过程中土壤Ca 2+和速效磷变化显著相关的细菌群落。进一步的功能模拟揭示了Ca 2+和速效磷的变化可能会干扰土壤碳氮代谢，从而削弱土壤质量。综上所述，我们推测了喀斯特石漠化过程中钙驱动的细菌响应机制。(C)2018爱思唯尔出版社
Karst rocky desertification is a severe irreversible ecosystem failure. The karst ecosystem is so fragile that it is vulnerable to environmental changes, degrading into rocky desertification. Prior studies revealed the potential connections between the soil bacterial community, the edaphic properties and the aboveground vegetation cover in the karst ecosystem. However, how these three elements affect each other and work together in propelling in the karst rocky desertification progress largely remains unexplored. To answer this question, we monitored the bacterial community variations in soils sampled from multiple sites at a successional karst rocky desertification region by sequencing the 16S rRNA V3-V4 regions. Overall, we detected 34 bacterial phyla in the karst soils, of which Proteobacteria, Actinobacteria, and Acidobacteria are the most abundant. Network analysis of the bacterial community- vegetation-edaphic property-vegetation interactions identified 6 bacterial herds that had significant correlation with soil Ca2+ and available phosphorus change during vegetation degradation. Further functional simulation of these bacterial herds unveiled the change of Ca2+ and available phosphorus might disturb the soil carbon and nitrogen metabolism, and thus weakened soil quality. In summary, we hypothesized a calcium-driven bacterial response mechanism in the karst rocky desertification progress. (C) 2018 Published by Elsevier B.V.