禾本科植物对火灾季节性的功能性状响应的全球视角

IF 3 3区 农林科学 Q2 ECOLOGY Fire-Switzerland Pub Date : 2023-08-23 DOI:10.3390/fire6090329
M. Mndela, Humphrey K. Thamaga, B. Gusha
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引用次数: 1

摘要

在易发生火灾的生态系统中,植物对反复火灾的恢复力取决于某些火灾适应性特征。然而,人们对类禾本科的关键功能和繁殖特征如何应对不同的燃烧季节知之甚少。因此,这项荟萃分析揭示了禾本科植物(草和莎草)的呼吸、生长、繁殖和生产力特征对不同燃烧季节的反应。我们记录了80项实验研究中的569个观察结果,这些研究比较了不同燃烧季节未燃烧处理与燃烧处理的类禾本科植物性状反应。使用随机效应模型分析了每种植物性状的加权对数响应率和95%置信区间(95%CI),并在燃烧季节进行了比较。夏季(0.35(95%CI=0.25至0.46))和秋季烧伤(0.24(95%CI=0.16至0.31))增加了地上生物量m−2,而植物−1的生物量仅因春季烧伤而增加(0.27(95%CI=0.22至0.32))。茎高(0.29(95%CI=0.17至0.41))、叶长(0.15(95%CI=0.11至0.20))和比叶面积(0.08(95%CI=0.06至0.09))仅在夏季燃烧时增加,而春季(0.19(95%CI=0.00至0.38))和秋季燃烧时开花增加[0.34(95%CI=0.02至0.66)]。然而,种子产量m−2因春季和夏季烧伤而减少,而种子产量植物−1则相反。总的来说,草本植物对火灾的特性反应因燃烧季节而异,这与早春燃烧是最佳做法的一般原则不一致。我们建议,在决定焚烧季节时,应考虑焚烧的目的。
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A Global Perspective of the Functional Trait Responses of Graminoids to the Seasonality of Fire
In fire-prone ecosystems, plant resilience to recurrent fires depends on certain fire-adaptive traits. However, how key functional and reproductive traits of graminoids respond to varying burning seasons is poorly understood. This meta-analysis, therefore, unpacks global perspectives on how resprouting, growth, reproductive, and productivity traits of graminoids (grasses and sedges) respond to different burning seasons. We recorded 569 observations from 80 experimental studies comparing graminoid plant trait responses in unburned vs. burned treatments over different seasons of burn. Weighted log response ratios and 95% confidence intervals (95%CI) were analyzed for each plant trait using random effects models and compared across burning seasons. Summer (0.35 (95%CI = 0.25 to 0.46)) and autumn burns (0.24 (95%CI = 0.16 to 0.31)) increased above-ground biomass m−2, while biomass plant−1 was increased only by spring burns (0.27 (95%CI = 0.22 to 0.32)). Bud production plant−1 and tiller−1 were reduced significantly by fire, especially spring, summer, and autumn burns. The shoot height (0.29 (95%CI = 0.17 to 0.41)), leaf length (0.15 (95%CI = 0.11 to 0.20)), and specific leaf area (0.08 (95%CI = 0.06 to 0.09)) increased only under summer burns, while flowering was enhanced by spring (0.19 (95%CI = 0.00 to 0.38)) and autumn burns [0.34 (95%CI = 0.02 to 0.66)]. However, seed production m−2 was reduced by spring and summer burns and the opposite was true for seed production plant−1. Overall, herbaceous plant trait responses to fire varied by the season of burn, disagreeing with the general principle that early spring burning is the best practice. We suggest that a decision on the season of burn should be informed by the objective of burning.
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来源期刊
Fire-Switzerland
Fire-Switzerland Multiple-
CiteScore
3.10
自引率
15.60%
发文量
182
审稿时长
11 weeks
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