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Effects of phosphorus and nitrogen fertilization on soil arylsulfatase activity and sulfur availability of two tropical plantations in southern China

文献类型： 外文期刊

作者： Wang, Senhao 1 ; Zhou, Kaijun 5 ; Mori, Taiki 1 ; Mo, Jiangming 1 ; Zhang, Wei 1 ;

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

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

3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

4.Forestry & Forest Prod Res Inst, Dept Forest Site Environm, Matsunosato 1, Tsukuba, Ibaraki 3058687, Japan

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

关键词： Arylsulfatase; Ecoenzymatic stoichiometry; Exchangeable sulfur; Extracellular enzyme; Tropical plantation

期刊名称：FOREST ECOLOGY AND MANAGEMENT （ 影响因子：3.558； 五年影响因子：4.039 ）

ISSN： 0378-1127

年卷期： 2019 年 453 卷

页码：

收录情况： SCI

摘要： Understanding how phosphorus (P) and nitrogen (N) fertilization influence the dynamics of other nutrients [particularly sulfur (S)] is essential for improving the integrated nutrient management of tropical plantations. This study investigated how adding P and N fertilizers would affect S dynamics in the soils of two tropical forest plantations. Specifically, we tested whether the addition of P and N alters the availability of exchangeable S and microbial biomass S (MBS) and, hence, arylsulfatase activity (AS) and ratios of AS to C- and/or N-acquiring enzyme activity in the 0-5 cm soil layer were measured. The sites contained both control plots (no fertilizer application) and plots with 6-year continuous fertilizer (P and N) application. Soil exchangeable S clearly decreased, while AS activity marginally increased in P-fertilized plots. The ratios of soil AS activity to C- and/or N-acquiring enzyme activity tended to increase, possibly because the requirements of microbes for S relative to C and N were elevated, with P fertilization exacerbating shortages in S. In comparison, N fertilization did not influence exchangeable S, soil pH, and MBS. This lack of response might be attributed to continuous deposition of high levels of background N at the study sites. Soil AS activity and the ratios of soil AS activity to C- and/or N-acquiring enzyme activity tended to be lowered by N fertilization; thus, AS activity might be more sensitive to N fertilization than to soil pH. In conclusion, P fertilization must be carefully managed in tropical forest plantations to minimize its negative impact on soil S availability.

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