Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15985 |
Temperature and pH mediate stoichiometric constraints of organically derived soil nutrients | |
Ligia F. T. de Souza; Sharon A. Billings | |
2021-11-23 | |
发表期刊 | Global Change Biology |
出版年 | 2021 |
英文摘要 | It remains unclear how warming will affect resource flows during soil organic matter (SOM) decomposition, in part due to uncertainty in how exoenzymes produced by microbes and roots will function. Rising temperatures can enhance the activity of most exoenzymes, but soil pH can impose limitations on their catalytic efficiency. The effects of temperature and pH on enzyme activity are often examined in environmental samples, but purified enzyme kinetics reveal fundamental attributes of enzymes’ intrinsic temperature responses and how relative release of decay-liberated resources (their flow ratios) can change with environmental conditions. In this paper, we illuminate the principle that fundamental, biochemical limitations on SOM release of C, N, and P during decay, and differential exoenzymes’ responses to the environment, can exert biosphere-scale significance on the stoichiometry of bioavailable soil resources. To that end, we combined previously published intrinsic temperature sensitivities of two hydrolytic enzymes that release C and N during decay with a novel data set characterizing the kinetics of a P-releasing enzyme (acid phosphatase) across an ecologically relevant pH gradient. We use these data to estimate potential change in the flow ratios derived from these three enzymes’ activities (C:N, C:P, and N:P) at the global scale by the end of the century, based on temperature projections and soil pH distribution. Our results highlight how the temperature sensitivity of these hydrolytic enzymes and the influence of pH on that sensitivity can govern the relative availability of bioavailable resources derived from these enzymes. The work illuminates the utility of weaving well-defined kinetic constraints of microbes’ exoenzymes into models that incorporate changing SOM inputs and composition, nutrient availability, and microbial functioning into their efforts to project terrestrial ecosystem functioning in a changing climate. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/342393 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Ligia F. T. de Souza,Sharon A. Billings. Temperature and pH mediate stoichiometric constraints of organically derived soil nutrients[J]. Global Change Biology,2021. |
APA | Ligia F. T. de Souza,&Sharon A. Billings.(2021).Temperature and pH mediate stoichiometric constraints of organically derived soil nutrients.Global Change Biology. |
MLA | Ligia F. T. de Souza,et al."Temperature and pH mediate stoichiometric constraints of organically derived soil nutrients".Global Change Biology (2021). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论