Effects of soil freeze-thaw cycles differ between experimental plant communities
Effects of soil freeze-thaw cycles differ between experimental plant communities
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DOI：
10.1016/j.baae.2009.07.008
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发表时间：
2010-01-01
影响因子：
3.8
通讯作者：
Jentsch, Anke
中科院分区：
文献类型：
--
作者：
Kreyling, Juergen;Beierkuhnlein, Carl;Jentsch, Anke
土壤冻融循环（FTC）影响养分循环，但其对植被生产力和组成的后果没有得到很好的研究。持续的全球变暖将增加FTC在冷温带和高纬度地区的复发，在这里，我们报告的地上和地下的生物量生产以及两种常见的植被类型，草地和健康的氮营养，更频繁的FTC在中欧的控制现场实验。此外，我们分析了观察到的效果的持续时间。在2005/06年冬季，除了三个自然发生的FTC外，还通过埋置的电热丝诱导了五个FTC。更频繁的FTC显着增加地上生产的实验草地早在以下的生长季节。但在第一个生长季内，没有发现对实验健康的反应。在冻融处理后的第二年，石楠群落的生物量生产显著下降，C/N比增加，而草地群落的生产不再受到显着影响，除了C/N比增加。这种响应至少可以部分地解释养分供应的变化，植物有效硝酸盐增加在操纵草地地块和减少在操纵heath plots. Results显示气候变化在冬季的高生态重要性，与对比的植被类型之间的结果有很大的不同。此外，我们表明，短期的气候事件可能会造成长期的影响，有时出现在植被只有经过相当长的时间滞后（在这里：一个生长季节）。(C)2009 Gesellschaft fur Okologie.由Elsevier出版社出版。All rights reserved.
Soil freeze thaw cycles (FTC) influence nutrient cycling, but their consequences for productivity and composition of vegetation are not well investigated. Ongoing global warming will increase the recurrence of FTC in cool-temperate and high-latitude regions.Here, we report on the above- and belowground biomass production as well as the nitrogen nutrition of two common vegetation types, grassland and heath, after more frequent FTC in a controlled field experiment in Central Europe. Furthermore, we analyze the duration of the observed effects. Five FTC were induced by buried heating wires in addition to three naturally occurring FTC during winter 2005/06. More frequent FTC significantly increased aboveground production of experimental grassland early in the following growing season. However, no reaction was found for experimental heath within the first growing season. Biomass production of heath communities dropped significantly and C/N ratio increased in the freeze thaw treated plots in the second year after the manipulation, whereas production in the grassland communities was no longer affected significantly, except for an increase in C/N ratio. This response can at least partly be explained by changes in nutrient availability, as plant available nitrate increased in the manipulated grassland plots and decreased in the manipulated heath plots.The results show the high ecological importance of climate changes during winter, with the outcomes differing strongly between contrasting vegetation types. Furthermore, we show that short term climatic events can cause long-lasting effects, sometimes emerging in the vegetation only after considerable time lags (here: one growing season). (C) 2009 Gesellschaft fur Okologie. Published by Elsevier Gmbh. All rights reserved.