Root and shoot phenology and root longevity of Norway spruce saplings grown at different soil temperatures
| Autor: | Ilkka Leinonen, Jouni Kilpeläinen, Leena Finér, Tapani Repo, Aija Ryyppö, Tarja Lehto, Pedro J. Aphalo, Timo Domisch |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Global and Planetary Change Ecology Picea abies Phenology media_common.quotation_subject Carbon pool Longevity minirhizotron Climate change Forestry fine-root survival 15. Life on land Biology 010603 evolutionary biology 01 natural sciences fine-root dynamics Tree (data structure) climate change Soil temperature Agronomy Shoot 010606 plant biology & botany media_common |
| Zdroj: | Canadian Journal of Forest Research. 49:1441-1452 |
| ISSN: | 1208-6037 0045-5067 |
| DOI: | 10.1139/cjfr-2019-0190 |
| Popis: | Tree roots comprise a huge carbon pool. Their dynamics are driven by environmental factors and thereby affected by climate change. We studied the effects of soil temperature on root and shoot phenology and their linkages in Norway spruce (Picea abies (L.) Karst.). Saplings were grown in controlled-environment rooms for three simulated growing seasons (GS1, GS2, and GS3). Soil-temperature treatments of 9, 13, 18, and 21 °C were applied during GS2. Root growth was monitored with minirhizotrons and commenced in all treatments simultaneously. Temporal growth patterns of short and long roots were usually bimodal. Root growth was very low during the coldest treatment of GS2 but increased during GS3 as an aftereffect. During GS3, growth of short roots continued later after colder treatments than warmer treatments. Reduced sink strength of roots and increased carbohydrate accumulation into needles at 9 °C during GS2 probably enabled compensatory root growth under restored temperatures during GS3. Soil temperature did not affect shoot phenology, and root and shoot phenology varied between growing seasons; thus, the linkage of root and shoot phenology was inconsistent. In warmer soil, root longevity was shorter and turnover rate was higher than in colder soil. This can further affect soil carbon dynamics and ecosystem carbon cycling in boreal forest ecosystems. |
| Databáze: | OpenAIRE |
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