Root-induced changes in nutrient cycling in forests depend on exudation rates
文献类型：期刊论文
| 作者 | Yin, Huajun ; Wheeler, Emily ; Phillips, Richard P. |
| 刊名 | SOIL BIOLOGY & BIOCHEMISTRY
 |
| 出版日期 | 2014 |
| 卷号 | 78页码:213-221 |
| 关键词 | Arbuscular mycorrhizal fungi Ectomycorrhizal fungi Plant-microbial feedbacks Priming effects Root exudation Rhizodeposition |
| 产权排序 | 1 |
| 通讯作者 | Phillips, RP (reprint author), Indiana Univ, Dept Biol, 1001 E Third St, Bloomington, IN 47403 USA. |
| 合作状况 | 其它 |
| 英文摘要 | (1) While it is well-known that trees release carbon (C) to soils as root exudates, the factors that control the magnitude and biogeochemical impacts of this flux are poorly understood. (2) We quantified root exudation and microbially-mediated nutrient fluxes in the rhizosphere for four similar to 80 year-old tree species in a deciduous hardwood forest, Indiana, USA. We hypothesized that trees that exuded the most carbon (C) would induce the strongest rhizosphere effects (i.e., the relative difference in nutrient fluxes between rhizosphere and bulk soil). Further, we hypothesized that tree species that associate with ectomycorrhizal (ECM) fungi would exude more C than tree species that associate with arbuscular mycorrhizal (AM) fungi, resulting in a greater enhancement of nutrient cycling in ECM rhizospheres. (3) Mass-specific exudation rates and rhizosphere effects on C, N and P cycling were nearly two-fold greater for the two ECM tree species compared to the two AM tree species (P < 0.05). Moreover, across all species, exudation rates were positively correlated with multiple indices of nutrient cycling and organic matter decomposition in the rhizosphere (P < 0.05). Annually, we estimate that root exudation represents 2.5% of NPP in this forest, and that the exudate-induced changes in microbial N cycling may contribute similar to 18% of total net N mineralization. (4) Collectively, our results indicate that the effects of roots on nutrient cycling are consequential, particularly in forests where the C cost of mining nutrients from decomposing soil organic matter may be greatest (e.g., ECM-dominated stands). Further, our results suggest that small C fluxes from exudation may have disproportionate impacts on ecosystem N cycling in nutrient-limited forests. (C) 2014 Elsevier Ltd. All rights reserved. |
| 学科主题 | Soil Science |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2016-02-26 |
| 源URL | [http://210.75.237.14/handle/351003/26496]  |
| 专题 | 成都生物研究所_生态研究 |
| 推荐引用方式 GB/T 7714 | Yin, Huajun,Wheeler, Emily,Phillips, Richard P.. Root-induced changes in nutrient cycling in forests depend on exudation rates[J]. SOIL BIOLOGY & BIOCHEMISTRY,2014,78:213-221. |
| APA | Yin, Huajun,Wheeler, Emily,&Phillips, Richard P..(2014).Root-induced changes in nutrient cycling in forests depend on exudation rates.SOIL BIOLOGY & BIOCHEMISTRY,78,213-221. |
| MLA | Yin, Huajun,et al."Root-induced changes in nutrient cycling in forests depend on exudation rates".SOIL BIOLOGY & BIOCHEMISTRY 78(2014):213-221. |
入库方式： OAI收割
来源：成都生物研究所
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