Effect of repeated burning on plant and soil carbon and nitrogen in cheatgrass (Bromus tectorum) dominated ecosystems
Effect of repeated burning on plant and soil carbon and nitrogen in cheatgrass (Bromus tectorum) dominated ecosystems
复制标题
重复燃烧对以雀麦 (Bromus tectorum) 为主的生态系统中植物和土壤碳和氮的影响
DOI：
10.1007/s11104-014-2242-2
复制
发表时间：
2014
期刊：
影响因子：
4.9
通讯作者：
D. Board
中科院分区：
文献类型：
--
作者：
Rachel O. Jones;J. Chambers;Dale W. Johnson;R. Blank;D. Board
背景和目的火对生态系统的性质有深远的影响，但很少有研究已经解决了重复燃烧对土壤养分的影响，并没有进行在寒冷的沙漠生态系统中，外来的一年生草的入侵导致更大的火灾frequency.MethodsIn一项为期5年的研究，我们检查了重复燃烧，凋落物清除，和火后播种对土壤中碳（C）和氮（N）含量的影响，枯枝落叶和植被在一个cheatgrass-dominated怀俄明州大山艾树生态类型。我们开发了一个多变量模型，以确定潜在的机制，影响治疗效果和环境因素的影响，如降水和temperature.ResultsWe发现，反复燃烧有很强的负效应凋落物C和N含量，但没有减少土壤养分或植被C和N含量，可能是由于冷火温度。凋落物清除或火灾后播种的影响很少。相反，降水和温度相互作用与燃烧，并有最强的影响土壤N和植被C和N含量随时间推移.ConclusionsManagement策略，旨在减少凋落物和种子库，增加竞争的相互作用可能是更有效地减少cheatgrass成功比减少土壤养分的方法。
Background and AimsFire has profound effects on ecosystem properties, but few studies have addressed the effect of repeated burns on soil nutrients, and none have been conducted in cold desert ecosystems where invasion by exotic annual grasses is resulting in greater fire frequency.MethodsIn a 5 year study, we examined effects of repeated burning, litter removal, and post-fire seeding on carbon (C) and nitrogen (N) contents in soils, litter, and vegetation in a cheatgrass-dominated Wyoming big sagebrush ecological type. We developed a multivariate model to identify potential mechanisms influencing treatment effects and examine the influence of environmental factors such as precipitation and temperature.ResultsWe found that repeated burning had strong negative effects on litter C and N contents, but did not reduce soil nutrients or vegetation C and N contents, likely due to cool fire temperatures. There were few effects of litter removal or post-fire seeding. Instead, precipitation and temperature interacted with burning and had the strongest influences on soil N and vegetation C and N contents over time.ConclusionsManagement strategies aimed at decreasing litter and seed banks and increasing competitive interactions may be more effective at reducing cheatgrass success than approaches for reducing soil nutrients.