Temperature Responses to Infrared-Loading and Water Table Manipulations in Peatland Mesocosms
Temperature Responses to Infrared-Loading and Water Table Manipulations in Peatland Mesocosms
复制标题
DOI：
10.1111/j.1744-7909.2008.00757.x
复制
发表时间：
2008-11-01
影响因子：
11.4
通讯作者：
Weltzin, Jake F.
中科院分区：
文献类型：
--
作者：
Chen, Jiquan;Bridgham, Scott;Weltzin, Jake F.
采用多因子全球变化试验研究了红外热负荷（HT）和地下水位（WL）处理对沼泽湿地和沼泽湿地围隔生态系统土壤温度（T）的影响。我们发现，温度变化很大的年，月，泥炭地类型，土壤深度，HT和WL操作。在2年的研究期间，HT对25厘米深度温度的最高影响出现在6月的沼泽围隔生态系统（3.34-4.27摄氏度），但在5月的沼泽围隔生态系统（2.32-4.33摄氏度）。沼泽围隔生态系统中WL的影响仅在8月至1月之间发现，在2年的研究期间，潮湿的围隔生态系统比干燥的围隔生态系统温暖0.48-2.03摄氏度。相比之下，潮湿的沼泽围隔生态系统通常较低0.16-3.87摄氏度。HT升高的温度的季节变化也因深度和生态系统类型而异，5 cm和10 cm深度的温差比25 cm和40 cm深度的温差季节波动小。然而，增加HT并不总是导致温暖的土壤，特别是在沼泽围隔生态系统。HT和WL操纵也改变了非冰冻季节的长度。
We initiated a multi-factor global change experiment to explore the effects of infrared heat loading (HT) and water table level (WL) treatment on soil temperature (T) in bog and fen peatland mesocosms. We found that the temperature varied highly by year, month, peatland type, soil depth, HT and WL manipulations. The highest effect of HT on the temperature at 25 cm depth was found in June for the bog mesocosms (3.34-4.27 degrees C) but in May for the fen mesocosms (2.32-4.33 degrees C) over the 2-year study period. The effects of WL in the bog mesocosms were only found between August and January, with the wet mesocosms warmer than the dry mesocosms by 0.48-2.03 degrees C over the 2-year study period. In contrast, wetter fen mesocosms were generally cooler by 0.16-3.87 degrees C. Seasonal changes of temperatures elevated by the HT also varied by depth and ecosystem type, with temperature differences at 5 cm and 10 cm depth showing smaller seasonal fluctuations than those at 25 cm and 40 cm in the bog mesocosms. However, increased HT did not always lead to warmer soil, especially in the fen mesocosms. Both HT and WL manipulations have also changed the length of the non-frozen season.