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Nitrogen enrichment affects soil enzymatic stoichiometry via soil acidification in arid and hot land
Pedobiologia ( IF 2.3 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.pedobi.2020.150663
Bangguo Yan , Yi Sun , Guangxiong He , Runlian He , Mengyin Zhang , Haidong Fang , Liangtao Shi

Abstract Soil enzymatic stoichiometry reflects the patterns of soil microbial resource allocation for the acquisition of nutrients from different forms of soil organic matter. Nitrogen enrichment derived from human activities greatly affects soil biological properties and chemical properties. However, the mechanism for changing soil enzymatic stoichiometry due to nitrogen enrichment remains unclear. We established a factorial field experiment in an arid-hot valley to investigate the effects of nitrogen addition and plant species on the enzymatic stoichiometries for leucine aminopeptidase (LAP), acid phosphatase (AP), β-1,4-glucosidase (BG) and β-N-acetyl glucosaminidase (NAG). We found that nitrogen addition consistently reduced LAP activities but elevated AP activities beneath different grass species. Plant species had no effects on soil enzymatic stoichiometries although it significantly influenced the absolute values of soil enzyme activities. Nitrogen addition increased ln(BG):ln(LAP), but decreased ln(BG):ln(AP), ln(LAP):ln(NAG) and ln(LAP):ln(AP). Furthermore, by using structure equation modelling analyses, we found that the effects of N addition on enzymatic stoichiometries were mediated by soil acidification and microbial community structures. Our findings highlight that soil acidification alters microbial community structures and the patterns of microbial resource allocation for nutrient acquisition, both of which in turn play important roles in shaping soil enzymatic stoichiometry under the scenario of nitrogen enrichment.

中文翻译:

氮富集通过干旱和热地土壤酸化影响土壤酶化学计量

摘要 土壤酶化学计量反映了土壤微生物资源分配模式,以从不同形式的土壤有机质中获取养分。人类活动产生的富氮对土壤生物性质和化学性质有很大影响。然而,由于氮富集而改变土壤酶化学计量的机制仍不清楚。我们在干旱炎热的山谷建立了一个因子田间试验,以研究氮添加和植物物种对亮氨酸氨肽酶 (LAP)、酸性磷酸酶 (AP)、β-1,4-葡萄糖苷酶 (BG) 和β-N-乙酰氨基葡萄糖苷酶 (NAG)。我们发现,在不同的草种下,添加氮会持续降低 LAP 活性,但会提高 AP 活性。植物种类对土壤酶化学计量没有影响,尽管它显着影响土壤酶活性的绝对值。添加氮会增加 ln(BG):ln(LAP),但会降低 ln(BG):ln(AP)、ln(LAP):ln(NAG) 和 ln(LAP):ln(AP)。此外,通过使用结构方程模型分析,我们发现氮添加对酶化学计量的影响是由土壤酸化和微生物群落结构介导的。我们的研究结果强调,土壤酸化改变了微生物群落结构和微生物获取养分的资源分配模式,这两者反过来在氮富集情景下对土壤酶化学计量学的形成起着重要作用。添加氮会增加 ln(BG):ln(LAP),但会降低 ln(BG):ln(AP)、ln(LAP):ln(NAG) 和 ln(LAP):ln(AP)。此外,通过使用结构方程模型分析,我们发现氮添加对酶化学计量的影响是由土壤酸化和微生物群落结构介导的。我们的研究结果强调,土壤酸化改变了微生物群落结构和微生物获取养分的资源分配模式,这两者反过来在富氮情景下对土壤酶化学计量学的形成起着重要作用。添加氮会增加 ln(BG):ln(LAP),但会降低 ln(BG):ln(AP)、ln(LAP):ln(NAG) 和 ln(LAP):ln(AP)。此外,通过使用结构方程模型分析,我们发现氮添加对酶化学计量的影响是由土壤酸化和微生物群落结构介导的。我们的研究结果强调,土壤酸化改变了微生物群落结构和微生物获取养分的资源分配模式,这两者反过来在氮富集情景下对土壤酶化学计量学的形成起着重要作用。我们发现 N 添加对酶化学计量的影响是由土壤酸化和微生物群落结构介导的。我们的研究结果强调,土壤酸化改变了微生物群落结构和微生物获取养分的资源分配模式,这两者反过来在富氮情景下对土壤酶化学计量学的形成起着重要作用。我们发现 N 添加对酶化学计量的影响是由土壤酸化和微生物群落结构介导的。我们的研究结果强调,土壤酸化改变了微生物群落结构和微生物获取养分的资源分配模式,这两者反过来在氮富集情景下对土壤酶化学计量学的形成起着重要作用。
更新日期:2020-09-01
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