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Diversity-triggered bottom-up trophic interactions impair key soil functions under lindane pollution stress
Environmental Pollution ( IF 8.9 ) Pub Date : 2022-09-29 , DOI: 10.1016/j.envpol.2022.120293
Xueling Yang 1 , Xiaowei Huang 1 , Jie Cheng 1 , Zhongyi Cheng 1 , Qi Yang 1 , Lingfei Hu 1 , Jianming Xu 1 , Yan He 1
Affiliation  

A growing amount of evidence suggests that microbial diversity loss may have negative effects on soil ecosystem function. However, less attention has been paid to the determinants of the relationship between community diversity and soil functioning under pollution stress. Here we manipulated microbial diversity to observe how biotic and abiotic factors influenced soil multi-functions (e.g. lindane degradation, soil respiration and nutrient cycling). Results showed that protist community was more sensitive to dilution, pollution stress, and sodium acetate addition than bacterial and fungal community. Acetate addition accelerated the lindane removal. Any declines in microbial diversity reduced the specialized soil processes (NO3–N production, and N2O flux), but increased soil respiration rate. Dilution led to a significant increase in consumers-bacterial and fungi-bacterial interaction as evidenced by co-occurrence network, which possibly played roles in maintaining microbiome stability and resilience. Interestingly, pollution stress and resource availability weaken the relationship between microbial diversity and soil functions through the bottom-up trophic interaction and environmental preference of soil microbiome. Overall, this work provides experimental evidence that loss in microbial diversity, accompanied with changes in trophic interactions mediated biotic and abiotic factors, could have important consequences for specialized soil functioning in farmland ecosystems.



中文翻译:

林丹污染胁迫下多样性触发的自下而上营养相互作用损害了关键土壤功能

越来越多的证据表明,微生物多样性丧失可能对土壤生态系统功能产生负面影响。然而,对污染压力下群落多样性与土壤功能之间关系的决定因素的关注较少。在这里,我们操纵微生物多样性来观察生物和非生物因素如何影响土壤的多功能(例如林丹降解、土壤呼吸和养分循环)。结果表明,原生生物群落对稀释、污染胁迫和醋酸钠添加比细菌和真菌群落更敏感。醋酸盐的加入加速了林丹的去除。微生物多样性的任何下降都会减少特殊的土壤过程(NO 3 -N 产生和 N 2O 通量),但增加了土壤呼吸速率。稀释导致消费者-细菌和真菌-细菌相互作用显着增加,共现网络证明了这一点,这可能在维持微生物组的稳定性和弹性方面发挥了作用。有趣的是,污染压力和资源可用性通过自下而上的营养相互作用和土壤微生物组的环境偏好,削弱了微生物多样性与土壤功能之间的关系。总体而言,这项工作提供了实验证据,表明微生物多样性的丧失,以及营养相互作用介导的生物和非生物因素的变化,可能对农田生态系统中的特殊土壤功能产生重要影响。

更新日期:2022-09-29
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