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- Title
不同密度华北落叶松径向生长对干旱事件的响应.
- Authors
张子航; 王 恒; 贾建恒; 孙昊慷; 韩佳轩; 郭明明
- Abstract
In recent years, a surge in drought occurrences has dramatically impacted tree growth worldwide. We examined the ecological resilience of Larix principis-rupprechtii plantations with varying densities (1950, 2355, and 2595 trees hm-2) at the Saihanba Mechanical Forest Farm, by extracting the increment cores using the standard dendrochronological method to measure individual-tree basal area increments (BAI) as part of our assessment of ecological resilience, including resistance (Rt), recovery (Rc), and resilience (Rs). The results showed that drought events occurred in 2006-2010, 2015, and 2018. The Rt for L. principis-rupprechtii plantations varied from 0.76 to 2.01 across three drought events, indicating generally high resistance, except for the plantation with 2355 trees. hm-2 during the second dry year (Rt=0.69). The Rt for the plantation with 2595 trees. hm-2 significantly decreased across all drought events, while no significant change was observed in the plantations with 1950 and 2355 trees. hm-2. The Rc showed no differences in response to a single drought event across plantation densities, with a significant upward trend for all the densities with each occurrence of drought event. There was no significant difference in the resilience of different densities of L. principis-rupprechtii to the first drought event, whereas the plantation with 2595 trees hm-2 exhibited significantly lower Rs during the second and third drought events compared with 1950 and 2355 trees hm-2, respectively. During the 2015 drought event, plantation with 2595 trees. hm-2 experienced a significant growth decline (radial growth change rate was 26.5%), while no such decline was observed in the plantations with 1950 and 2355 trees. hm-2. Overall, the plantation with 2595 trees hm-2 demonstrated the lowest resilience to drought events.
- Publication
Yingyong Shengtai Xuebao, 2024, Vol 35, Issue 5, p1169
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.202405.005