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Effects of 14-year continuous nitrogen addition on soil arylsulfatase and phosphodiesterase activities in a mature tropical forest

文献类型： 外文期刊

作者： Mori, Taiki 1 ; Zhou, Kaijun 1 ; Wang, Cong 1 ; Wang, Senhao 1 ; Wang, Yingping 5 ; Zheng, Mianhai 1 ; Lu, Xiankai 1 ; Zh 1 ;

作者机构： 1.Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Ec, South China Bot Garden, Guangzhou 510650, Peoples R China

2.Chinese Acad Sci, Ctr Plant Ecol, Core Bot Gardens, Guangzhou 510650, Peoples R China

3.Forestry & Forest Prod Res Inst, Kyushu Res Ctr, FFPRI, Kurokami 4-11-16, Kumamoto 8600862, Japan

4.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Peoples R China

5.CSIRO Oceans & Atmosphere, Aspendale, Vic 3195, Australia

6.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China

关键词： Arylsulfatase; Phosphomonoestarase; Phosphodiesterase; Nitrogen addition; Tropical forest

期刊名称：GLOBAL ECOLOGY AND CONSERVATION （ 影响因子：3.38； 五年影响因子：4.167 ）

ISSN： 2351-9894

年卷期： 2020 年 22 卷

页码：

收录情况： SCI

摘要： We investigated the impacts of 14-year continuous N addition on activities of arylsulfatase (AS) and phosphodiesterase (PDE), which catalyze soil organic sulfur (S) and phosphorus (P), respectively. The response of AS to N addition was compared with that of C- and N-acquiring enzymes, i.e., beta-1,4-glucosidase (BG), beta-D-cellobiohydrolase (CBH), beta-1,4-Xylosidase (BX), beta-1,4-N-acetyl-glucosaminnidase (NAG), and leucine amino peptidase (LAP). We also compared the impact of N addition on PDE activity with that on phosphomonoesterase (PME) activity. The results showed that N addition clearly decreased soil AS activity, whereas activities of C- and N-acquiring enzymes did not exhibit similar changes. The inconsistent response of AS activity with the enzymes was attributed to soil acidification induced by long-term N addition, which shifts the pH condition to a more optimal condition for AS activity and accelerates the accumulation of S in soils. The ratio of PME to PDE were significantly elevated by N addition, implying that the microbial and plant resource allocation to PME relative to PDE increased after N addition at our study site. The shift in resource allocation may have occurred because (i) the types of phosphatases secreted by biota shifted toward phosphatases that require one-step reaction to obtain P (such as PME) in the more-severely P-depleted condition, or (ii) soil acidification provided a more optimal condition for PDE than PME, which resulted in lower PDE production appearing as lower enzyme activity at the same pH condition in the laboratory. Overall, our results indicated different responses of exoenzyme activities to external N input. This highlights the importance of atmospheric N deposition on microbial activity and collateral C and nutrient dynamics in tropical natural forests. (C) 2020 The Authors. Published by Elsevier B.V.

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