Extreme drought has limited effects on soil seed bank composition in desert grasslands
Extreme drought has limited effects on soil seed bank composition in desert grasslands
复制标题
极端干旱对荒漠草原土壤种子库组成影响有限
DOI：
10.1111/jvs.13089
复制
发表时间：
2021
影响因子：
2.8
通讯作者：
Collins, Scott L.
中科院分区：
文献类型：
--
作者：
Loydi, Alejandro;Collins, Scott L.
气候变化是否影响荒漠草原的植被和种子库组成？地点Sevilleta国家野生动物保护区，新墨西哥州，USA.MethodsVegetation和种子库物种组成记录在黑色格兰马（Bouteloua eriopoda）和蓝色格兰马（Bouteloua gracilis）草原。2013年，在每个研究中心建立了两个降雨操作和环境控制（n= 10）。处理包括极端干旱（生长季节降雨量减少-66%）和延迟季风（7月至8月期间捕获的降水，并在9月至10月重新应用）。评估了地上物种组成，并于2017年（实验开始五年后）收集了复合土壤样本。种子库进行了评估，使用出苗methods.ResultsRainfall处理增加了地上植被和种子库丰富度的蓝色格拉玛社区，但不是在黑色格拉玛社区。植被覆盖减少了降雨量的操作，但种子库密度增加或保持不变，与对照组相比。在地上植被中，一年生和多年生杂类草的覆盖率增加，占主导地位的多年生禾本科植物在干旱下减少。在土壤种子库中，物种组成是相似的所有治疗和占主导地位的一年生和多年生杂类草。由于种子库可以增强群落的长期稳定性，它们的抗旱性在维持这些草原群落干旱期间和干旱后的生态系统过程中起着重要作用。
QuestionDoes climate change affect vegetation and seed bank composition in desert grasslands?LocationSevilleta National Wildlife Refuge, New Mexico, USA.MethodsVegetation and seed bank species composition were recorded in black grama (Bouteloua eriopoda) and blue grama (Bouteloua gracilis) grasslands. At each site, two rainfall manipulations and ambient controls were established in 2013 (n= 10). Treatments included extreme drought (−66% rainfall reduction during the growing season) and delayed monsoon (precipitation captured during July–August and reapplied in September–October). Above‐ground species composition was assessed, and composite soil samples were collected in 2017, five years after the experiment started. Seed bank was evaluated using the seedling emergence method.ResultsRainfall treatments increased the above‐ground vegetation and seed bank richness in the blue grama community, but not in the black grama community. Vegetation cover was reduced by both rainfall manipulations, but seed bank density increased or remained the same compared with controls. In above‐ground vegetation, cover of annual and perennial forbs increased, and dominant perennial grasses decreased under drought. In the soil seed bank, species composition was similar among all treatments and was dominated by annual and perennial forbs.ConclusionsThe seed bank was more resistant to drought than above‐ground vegetation. Because seed banks can enhance long‐term community stability, their drought resistance plays an important role in maintaining ecosystem processes during and following drought in these grassland communities.
登录
查看更多内容
植物群落稳定性是由于整个群落跨气候移植后物种组合的变化造成的
影响因子：
3.4
作者：
Sara Tomiolo;Mark C. Bilton;K. Tielbörger
通讯作者：
K. Tielbörger
多汁卡鲁牲畜放牧和浏览的长期影响：纳马夸兰不同放牧制度下植被变化的 20 年研究§
影响因子：
1.4
作者：
E. Nenzhelele;S. Todd;M. Hoffman
通讯作者：
M. Hoffman
干旱的生态——研讨会报告
影响因子：
2.4
作者：
A. Swemmer;W. Bond;J. Donaldson;G. Hempson;J. Malherbe;I. Smit
通讯作者：
I. Smit
影响因子：
5.5
作者：
Metz, Johannes;Liancourt, Pierre;Tielboerger, Katja
通讯作者：
Tielboerger, Katja
极端热浪和野火对高草草原植被的综合影响
影响因子：
2.8
作者：
Z. Ratajczak;A. Churchill;Laura M. Ladwig;Jeffrey H. Taylor;S. Collins
通讯作者：
S. Collins