降雨截流和静止期对土壤种子库的影响

IF 3.5 Q1 AGRONOMY
Thabo Patrick Magandana, A. Hassen, E. Tesfamariam
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引用次数: 0

摘要

世界各地的生态系统都受到气候变化的各种影响。气候变化也会影响土壤种子库,因为种子库是由地面上的植物决定的。本研究旨在确定降雨拦截和静止期是否会影响土壤种子库。将截流作为主小区处理,采用四种不同的截流水平,即 15%、30%、60% 和 0%,并使用避雨棚作为主小区处理,采用分小区试验设计,每种主小区处理重复五次。主小区面积为 49 平方米(7 米×7 米),由金属框架结构覆盖,顶部有 V 形透明丙烯酸带,不带紫外线滤光片,这些小区又分为两个小小区,以确定休眠期(70 天和 90 天)的影响。土壤样本直径为 8 厘米,深度为 20 厘米(1,005 立方厘米)。由于某些物种的种子非常小,我们采用种子萌发法而不是种子分离法来确定土壤种子库。60% 的降雨截流导致两个静止期的禁止植物密度都很高。静止期为 15% 和 30% 时,草本植物密度分别减少了 32% 和 35%,而静止期为 60% 时,草本植物密度比静止期为 0% 时增加了 195%。静止期对降雨量为 60% 的草地密度有明显影响,因为静止期为 70 天的草地密度高于静止期为 90 天的草地密度。在 90 天静止期,截流率为 0% 的处理的草密度明显高于其他处理,而截流率为 60% 的处理的草密度则明显低于其他处理。截流 60% 的降雨量使两个静止期的总密度(牧草和禾本科植物)都明显增加(p< 0.05)。在 15%和 60%的截流率下,总密度分别增加了 2.9% 和 143.48%。我们的研究结果表明,干旱对禾本科植物的土壤种子库有负面影响,而对牧草的土壤种子库则有改善作用。此外,静止期对草地土壤种子库没有显著影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of rainfall interception and resting period on the soil seed bank
The ecosystems across the world are affected by diverse impacts of climate change. Climate change will also affect soil seed bank as the seed bank is determined by the plants that are above the ground. This study was conducted to determine whether rainfall interception and resting period will affect the soil seed bank or not. Rainfall interception was employed as main plot treatment at four different levels—namely, 15%, 30%, 60%, and 0%—and the main plot treatments were each replicated five times using the rainout shelters arranged as main plot treatments in a split-plot experimental design. The main plots are 49 m2 (7 m × 7 m) in size and were covered by metal frame structures with V-shaped clear acrylic bands on top without ultraviolet filter, and these plots were sub-divided into two sub-plots to determine the effect of resting periods (70 and 90 days). The soil samples were 8 cm in diameter and 20 cm in depth (1,005 cm3). We used seed emergence method rather than seed separation method to determine the soil seed bank due to the very small size of some seeds for some species. The 60% rainfall interception resulted in significantly high forb densities at both resting periods. The forb densities decreased by 32 and 35% at 15% and 30%, while they increased by 195% at 60% rainfall interception compared to 0% rainfall interception at 70-day resting period. Resting period significantly affected grass densities at 60% rainfall as the densities were higher at 70- than 90-day resting period. At 90-day resting period, grass densities were significantly higher at 0% rainfall interception than the rest of the treatments, while the grass densities were significantly lower at 60% rainfall interception. The 60% rainfall interception resulted in significantly (p< 0.05) higher total densities (forbs and grass) in both resting periods. Total density increased by 2.9% and 143.48% at 15% and 60% rainfall interception, respectively. Our results show that drought has a negative effect on grass soil seed bank, while it improves the forbs soil seed bank. Furthermore, the resting period has no significant effects on soil seed bank in grasslands.
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来源期刊
Frontiers in Agronomy
Frontiers in Agronomy Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
4.80
自引率
0.00%
发文量
123
审稿时长
13 weeks
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