Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s00442-004-1520-8 |
Hierarchy of responses to resource pulses in and and semi-arid ecosystems | |
Schwinning, S; Sala, OE | |
通讯作者 | Schwinning, S |
来源期刊 | OECOLOGIA
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ISSN | 0029-8549 |
出版年 | 2004 |
卷号 | 141期号:2页码:211-220 |
英文摘要 | In arid/semi-arid ecosystems, biological resources, such as water, soil nutrients, and plant biomass, typically go through periods of high and low abundance. Short periods of high resource abundance are usually triggered by rainfall events, which, despite of the overall scarcity of rain, can saturate the resource demand of some biological processes for a time. This review develops the idea that there exists a hierarchy of soil moisture pulse events with a corresponding hierarchy of ecological responses, such that small pulses only trigger a small number of relatively minor ecological events, and larger pulses trigger a more inclusive set and some larger ecological events. This framework hinges on the observation that many biological state changes, where organisms transition from a state of lower to higher physiological activity, require a minimal triggering event size. Response thresholds are often determined by the ability of organisms to utilize soil moisture pulses of different infiltration depth or duration. For example, brief, shallow pulses can only affect surface dwelling organisms with fast response times and high tolerance for low resource levels, such as some species of the soil micro-fauna and -flora, while it takes more water and deeper infiltration to affect the physiology, growth or reproduction of higher plants. This review first discusses how precipitation, climate and site factors translate into soil moisture pulses of varying magnitude and duration. Next, the idea of the response hierarchy for ecosystem processes is developed, followed by an exploration of the possible evolutionary background for the existence of response thresholds to resource pulses. The review concludes with an outlook on global change: does the hierarchical view of precipitation effects in ecosystems provide new perspectives on the future of arid/semiarid lands? |
英文关键词 | climate change ecosystem structure precipitation thresholds precipitation variability rainfall size |
类型 | Article |
语种 | 英语 |
国家 | USA ; Argentina |
收录类别 | SCI-E |
WOS记录号 | WOS:000224528200003 |
WOS关键词 | SHORTGRASS STEPPE ; COLORADO PLATEAU ; RAINFALL EVENTS ; DYNAMICS ; DROUGHT ; SOIL ; PRECIPITATION ; BIODIVERSITY ; POPULATION ; SHRUBS |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | University of Arizona |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/147743 |
作者单位 | (1)Univ Arizona, Sch Nat Resources, Tucson, AZ 85721 USA;(2)Univ Buenos Aires, Fac Agron, Dept Ecol, RA-1417 Buenos Aires, DF, Argentina;(3)Univ Buenos Aires, Fac Agron, IFEVA, Buenos Aires, DF, Argentina;(4)Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina |
推荐引用方式 GB/T 7714 | Schwinning, S,Sala, OE. Hierarchy of responses to resource pulses in and and semi-arid ecosystems[J]. University of Arizona,2004,141(2):211-220. |
APA | Schwinning, S,&Sala, OE.(2004).Hierarchy of responses to resource pulses in and and semi-arid ecosystems.OECOLOGIA,141(2),211-220. |
MLA | Schwinning, S,et al."Hierarchy of responses to resource pulses in and and semi-arid ecosystems".OECOLOGIA 141.2(2004):211-220. |
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