Variations of soil enzyme activities in a temperate forest soil |
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Authors: | Kang Hojeong Kang Sinkyu Lee Dowon |
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Institution: | (1) School of Civil and Environmental Engineering, Yonsei University, Seoul, Korea;(2) Department of Environmental Sciences, Kangwon National University, Choonchun, Korea;(3) Graduate School of Environmental Studies, Seoul National University, Seoul, Korea |
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Abstract: | Soil enzyme activities (dehydrogenase, urease, phosphatase, and arylsulfatase) in a temperate forest soil were determined
in relation to landscape position and seasons. Overstory of the area is dominated by Quercus mongolica, Kalopanax pictus, Carpicus cordata, and Acer pseudo-sieboldianum. The activities were measured in three patches, namely a north-facing backslope, a ridge, and a south-facing backslope in
autumn and spring over 2 years. In addition, spatially more detailed analysis for phosphatase was conducted before and after
litterfall production in six patches. Dehydrogenase, urease, phosphatase, and arylsulfatase activities varied 1.8–18.5 μg
INT-formazan g−1 h−1, 45.4–347.0 μg NH4
+ g−1 h−1, 0.9–4.5 mmol pNP g−1 h−1, and 0.7–2.6 mmol pNP g−1 h−1, respectively. In general, higher enzyme activities were found in the northern aspect than in the southern aspect. This variation
appears to be related to differences in chemical properties (e.g., Fe, Al, and Mg) of soil as well as distribution of leaf
litter. Two patterns were discernible in relation to seasonal variations. Dehydrogenase and urease exhibited a positive correlation
with mean air temperature, suggesting that temperature would be a major controlling variable for those enzymes. In contrast,
higher activities were detected in autumn for phosphatase and arylsulfatase activities, which appeared to be closely related
to litter production and distribution. Overall results of this study indicate that soil enzyme activities in a forest floor
are influenced by several variables such as temperature, nutrient availability, and input of leaf litter, which are closely
related to landscape position. |
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