| 来源类型 | Article |
| 规范类型 | 其他 |
| DOI | 10.1002/ece3.4275 |
| Latitudinal effects on crown shape evolution. | |
| Lindh M; Falster DS; Zhang L; Dieckmann U; Brännström Å | |
| 发表日期 | 2018 |
| 出处 | Ecology and Evolution 8 (16): 8149-8158 |
| 出版年 | 2018 |
| 语种 | 英语 |
| 摘要 | Large variations in crown shape are observed across the globe, from plants with wide and deep crowns to those with leaves clustered at the top. While there have been advances in the large‐scale monitoring of forests, little is known about factors driving variations in crown shape with environmental conditions. Previous theoretical research suggests a gradient in crown shape with latitude, due to the effects of sun angle. Yet, it remains unclear whether such changes are also predicted under competition. Using a size‐structured forest‐growth model that incorporates self‐shading from plants and competitive shading from their neighbors, we investigate how changes in site productivity and sun angle shape crown evolution. We consider evolution in two traits describing the top‐heaviness and width‐to‐height ratio of crowns, shaped by trade‐offs reflecting the costs and benefits of alternative architectures. In top‐heavy trees, most of the leaves are at the top half of the trunk. We show that, contrary to common belief, the angle of sun beams per se has only a weak influence on crown shapes, except at low site productivity. By contrast, reduced site productivity has a strong effect, with trees growing in less productive sites keeping their leaves closer to the ground. The crown width‐to‐height ratio is generally higher at a lower site productivity, but this trait is not strongly influenced by any environmental factor. This theoretical analysis brings into question established beliefs about the effects of latitude on crown shapes. By introducing geometry‐related growth constraints caused by shading from both the surrounding forest and the tree on itself, and costs for constructing and maintaining a three‐dimensional crown, our analysis suggests crown shapes may vary with latitude, mostly via effects on overall site productivity, and less because of the angle of the sun. |
| 主题 | Evolution and Ecology (EEP) ; Young Scientists Summer Program (YSSP) |
| 关键词 | Adaptive dynamics, Crown, Evolution, Latitude, Productivity, Shape, Sun angle, Tree |
| URL | http://pure.iiasa.ac.at/id/eprint/15405/ |
| 来源智库 | International Institute for Applied Systems Analysis (Austria) |
| 引用统计 | |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/131188 |
| 推荐引用方式 GB/T 7714 | Lindh M,Falster DS,Zhang L,et al. Latitudinal effects on crown shape evolution.. 2018. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
| 1-s2.0-S019592551400（765KB） | 智库出版物 | 限制开放 | CC BY-NC-SA | 浏览 | ||
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