| Autor: |
Cao, Penghe, Wang, Weifeng, Xu, Xuan, Li, Li, Yu, Shuiqiang, Wu, Yongbo, Xue, Jianhui, Wang, Yuchao, Wang, Miao |
| Předmět: |
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| Zdroj: |
New Forests; Jul2024, Vol. 55 Issue 4, p825-843, 19p |
| Abstrakt: |
Non-structural carbohydrate (NSC) reserves constitute the critical cornerstone of forest resilience to adversity and post-disaster recovery. Planting densities and configurations affect the growth and physiological processes of trees and are essential to investigate the effects of planting densities and configurations on the storage and allocation of NSC in trees for afforestation strategies. We investigated the seasonal dynamics of NSC in various organs (leaves, branches, stems, coarse roots, and fine roots) of Populus sp. in a stand density experiment located on the western bank of Hongze Lake, Jiangsu, China to assess the whole-tree carbon budget. We used a nested sampling design of stands with density as the first factor, which included two levels [400 vs. 277 stems per hectare (sph)], and spacing configuration (square vs. rectangular) as the nested factor. Our results indicated that the seasonal characteristics of NSC in poplar were obvious, with NSC in storage organs being consumed for growth from March to May and gradually accumulating after July, peaking in November, with the highest fluctuations in branches and stems. The NSC pool was dominated by starch (72.73 ± 4.28%), and the stems (65.49 ± 5.43%) contributed more than half of the whole-tree starch pool, and the branches were the largest sugar pool (39.88 ± 8.36%). The seasonal patterns in poplar NSC were similar across different planting densities and configurations, whereas the NSC pool size varied significantly across configurations. Low planting density (277 sph) with square configuration increases NSC storage to optimum levels at the individual and stand scales. A square configuration with low intraspecific competition might be an optimal afforestation practice to enhance carbon sequestration in poplar plantations located in temperate monsoon climates. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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