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Differential responses of soil hydrolytic and oxidative enzyme activities to the natural forest conversion.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-01-27 , DOI: 10.1016/j.scitotenv.2019.136414 Gang Xu 1 , Zhijian Long 2 , Peng Ren 2 , Chengjie Ren 3 , Ying Cao 2 , Yan Huang 2 , Shanglian Hu 2
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-01-27 , DOI: 10.1016/j.scitotenv.2019.136414 Gang Xu 1 , Zhijian Long 2 , Peng Ren 2 , Chengjie Ren 3 , Ying Cao 2 , Yan Huang 2 , Shanglian Hu 2
Affiliation
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Effects of natural forest conversion (NFC) on soil nutrient turnover are substantially mediated by soil microbial extracellular hydrolytic enzymatic activities (Hy-EEAs) and oxidative enzymatic activities (Ox-EEAs). Yet it remains largely unknown the indicative links between soil Hy- and Ox-EEAs and soil carbon (C), nitrogen (N) and phosphorus (P) supplies based on economic theories of microbial metabolism under NFC. Here we used a meta-analysis approach to synthesize the responses of the soil C-, N-, P-degrading Hy-EEAs and Ox-EEAs, soil microbial biomass, soil organic C, total N, P and available P parameters to natural forest conversion from 51 peer-reviewed studies. Our results showed that NFC notably decreased soil Hy-EEAs but statistically insignificant reduction of soil Ox-EEAs. The changes of soil Hy- and Ox-EEAs were significantly and positively associated with soil organic C, available P as well as microbial biomass C and N but significantly and negatively correlated with soil pH, whereas the changes of soil C/N impacted on soil Ox-EEAs remarkably but not for soil Hy-EEAs. The depletion of soil organic carbon stimulated soil microbial secretion of Hy- and Ox-EEAs. The soil total N scarcity only provoked soil microbial Hy-EEAs rather than Ox-EEAs. The soil total P dearth quickened the soil Ox-EEAs, however, the plenitude of soil available P suppressed soil Hy- and Ox-EEAs. Moreover, the eco-enzymatic stoichiometry of soil Hy-EEAs indicated that soil N and P nutrient limitation after NFC restricted soil microbial N- and P-acquiring enzymes secretion, which ultimately reduced resources availability for C acquisition. Altogether, the distinct responses of soil Hy- and Ox-EEAs depended on substrate availability peculiarly for soil N and P gains of microorganisms for further enzymatic ability on soil C decomposition and highlighted the abundant or absent supply of soil N and P for positive or negative enzymatic activities on metabolic requirement of soil edaphons.
中文翻译：
土壤水解和氧化酶活性对天然林转化的差异响应。
天然林转化（NFC）对土壤养分转化的影响主要是由土壤微生物的细胞外水解酶活性（Hy-EEAs）和氧化酶活性（Ox-EEAs）介导的。但是，基于NFC下微生物代谢的经济理论，土壤Hy-和Ox-EEA与土壤碳（C），氮（N）和磷（P）的供给之间的指示性联系仍是未知之数。在这里，我们使用了荟萃分析方法来合成降解土壤C，N，P的Hy-EEA和Ox-EEA，土壤微生物量，土壤有机碳，总N，P和可用P参数对自然的响应来自51个同行评审研究的森林转化。我们的结果表明，NFC显着降低了土壤Hy-EEA，但统计上降低了土壤Ox-EEA。土壤Hy-和Ox-EEAs的变化与土壤有机碳，有效磷以及微生物量C和N呈显着正相关，而与土壤pH呈显着负相关，而土壤C / N的变化对土壤有影响。 Ox-EEA显着，但土壤Hy-EEA则不然。土壤有机碳的消耗刺激了土壤中Hy-和Ox-EEAs的微生物分泌。土壤总氮缺乏仅引起土壤微生物Hy-EEAs，而不是Ox-EEAs。土壤总磷缺乏使土壤Ox-EEAs加快，但是，有效磷的充足抑制了土壤Hy-和Ox-EEAs。此外，土壤Hy-EEAs的生态酶化学计量学表明，NFC后土壤氮和磷的养分限制限制了土壤微生物氮和磷的获取酶的分泌，最终减少了碳素获取的资源可利用性。
更新日期：2020-01-27
中文翻译：
土壤水解和氧化酶活性对天然林转化的差异响应。
天然林转化（NFC）对土壤养分转化的影响主要是由土壤微生物的细胞外水解酶活性（Hy-EEAs）和氧化酶活性（Ox-EEAs）介导的。但是，基于NFC下微生物代谢的经济理论，土壤Hy-和Ox-EEA与土壤碳（C），氮（N）和磷（P）的供给之间的指示性联系仍是未知之数。在这里，我们使用了荟萃分析方法来合成降解土壤C，N，P的Hy-EEA和Ox-EEA，土壤微生物量，土壤有机碳，总N，P和可用P参数对自然的响应来自51个同行评审研究的森林转化。我们的结果表明，NFC显着降低了土壤Hy-EEA，但统计上降低了土壤Ox-EEA。土壤Hy-和Ox-EEAs的变化与土壤有机碳，有效磷以及微生物量C和N呈显着正相关，而与土壤pH呈显着负相关，而土壤C / N的变化对土壤有影响。 Ox-EEA显着，但土壤Hy-EEA则不然。土壤有机碳的消耗刺激了土壤中Hy-和Ox-EEAs的微生物分泌。土壤总氮缺乏仅引起土壤微生物Hy-EEAs，而不是Ox-EEAs。土壤总磷缺乏使土壤Ox-EEAs加快，但是，有效磷的充足抑制了土壤Hy-和Ox-EEAs。此外，土壤Hy-EEAs的生态酶化学计量学表明，NFC后土壤氮和磷的养分限制限制了土壤微生物氮和磷的获取酶的分泌，最终减少了碳素获取的资源可利用性。
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