Seasonal variation in chemistry, but not morphology, in roots of Quercus robur growing in different soil types
文献类型：SCI/SSCI论文
| 作者 | Zadworny M.; Mccormack, M. L.; Rawlik, K.; Jagodzinski, A. M. |
| 发表日期 | 2015 |
| 关键词 | nitrogen reserve oak forest root order diversity seasonal variation storage pinus-sylvestris l. branch order fine roots fraxinus-mandshurica nutrient resorption frost hardiness life-span nitrogen tree biomass |
| 英文摘要 | Patterns of root traits among different root orders and their variation across seasons are of considerable importance for soil resource acquisition and partitioning in forest ecosystems. We evaluated whether morphological, anatomical and biochemical traits varied among root orders of Quercus robur (L.) sampled across spring, summer and fall seasons and growing in two different soil types with contrasting site fertility. We found no consistent differences in root diameter and specific root length in relation to soil type or growing season. There was, however, a strong seasonal variation in patterns of nitrogen (N) concentration among root orders. During spring and summer, N concentration was highest in the most distal, absorptive portion of the root system. At the end of the growing season, we observed a sharp decline in the N concentration of these lower-order, absorptive roots and an increase in N concentration of the higher-order, transport roots. The specific mechanisms driving the seasonally changing N concentration remain unclear but are likely related to different functions of lower-order roots for absorption and higher-order roots for structure and storage. Future work should identify how common the observed seasonal changes in N concentration are across species and determine what specific environmental cues plants or roots use to trigger shifts in resource allocation within the root branching hierarchy. |
| 出处 | Tree Physiology |
| 卷 | 35 |
| 期 | 6 |
| 页 | 644-652 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0829-318X |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/39021]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Zadworny M.,Mccormack, M. L.,Rawlik, K.,et al. Seasonal variation in chemistry, but not morphology, in roots of Quercus robur growing in different soil types. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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