Microbial response of an acid forest soil to experimental soil warming

被引:52
作者
Arnold, SS [1 ]
Fernandez, IJ
Rustad, LE
Zibilske, LM
机构
[1] Univ Maine, Dept Forest Management, Orono, ME 04469 USA
[2] Univ Maine, Dept Plant Soil & Environm Sci, Orono, ME 04469 USA
[3] US Forest Serv, NE Forest Expt Stn, Durham, NH 03824 USA
关键词
forest soil activity; microbial biomass; temperature; moisture; dehydrogenase;
D O I
10.1007/s003740050614
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Effects of increased soil temperature on soil microbial biomass and dehydrogenase activity were examined on organic (O) horizon material in a low-elevation spruce-fir ecosystem. Soil temperature was maintained at 5 degrees C above ambient during the growing season in the experimental plots, and soil temperature, moisture, microbial biomass, and dehydrogenase activity were measured during the experiment. An incubation study was also conducted under three temperature regimes, 5, 15, and 25 degrees C, and under four moisture regimes of 20, 120, 220, and 320% to further evaluate these environmental factors on dehydrogenase activity and microbial biomass. Soil moisture content and microbial biomass controls were significantly lower (30% and 2 mu g g(-1) soil, respectively) in the heated plots during the treatment period, suggesting that moisture content was important in controlling microbial biomass. In the incubation study, temperature appeared more important than moisture in controlling microbial biomass and dehydrogenase activity. Increasing temperature be tween 5 degrees C and 25 degrees C resulted in significant decreases in microbial biomass and dehydrogenase activity.
引用
收藏
页码:239 / 244
页数:6
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