Pedosphere 23(4): 472--481, 2013
ISSN 1002-0160/CN 32-1315/P
©2013 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Seasonal variability in soil inorganic nitrogen across borders between woodland and farmland in the Songnen Plain of Northeast China |
LIN Chang-Cun1,2, FU Yao3,4, Liu Li3, WANG Kun2 and WANG De-Li3 |
1The Academy of Forestry, Beijing Forestry University, Beijing 100083 (China)
2
Department of Grassland Science, China Agricultural University, Beijing 100193 (China)
3
Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Northeast Normal University, and Key Laboratory of Ecological Restoration and Ecosystem Management of Jilin Province, Changchun 130024 (China)
4Chinese Research Academy of Environmental Sciences, Beijing 100012 (China) |
| ABSTRACT |
| To study the seasonal variability of soil inorganic nitrogen (N) across borders at the woodland-farmland ecotone and potential mechanisms, contents of soil inorganic N were measured during the dry season (May 20 and June 30) and the rainy season (August 10 and September 20) of 2006 in the Songnen Plain of Northeast China. The borders between farmland and woodland were determined by a border-and-ecotone detection analysis (BEDA). The ecotone limits, often referred to as the depth-of-edge influence (DEI), are critical for determining the scale at which edge effect operates. The results showed that the soil inorganic N border between the woodland and farmland was located further toward the woodland interior during the rainy season (DEI = 53.4 ± 8.7 m, August 10) than during the dry season (DEI = 35.0 ± 12.6 m, May 20). The seasonal variability in the soil inorganic N border was found to be associated with seasonal changes of deposition flux of N (the correlation coefficients between them for the dry season and rainy season were 0.61 and 0.67, respectively), which resulted from foliation patterns of trees and crops. Accordingly, the leaf area index at woodland edges was lower than that in the woodland interior, so woodland edges captured large amounts of atmosphere nitrogen deposition. The average DEI was 44.1 m, which was in accordance with the values of other temperate forest boundaries in literatures; therefore, BEDA was an appropriate method to estimate the borders of ecotones. |
| Key Words: depth-of-edge influence, ecotone, semi-arid, woodland edge |
| Citation: Lin, C. C., Fu, Y., Liu, L., Wang, K. and Wang, D. L. 2013. Seasonal variability in soil inorganic nitrogen across borders between woodland and farmland in the Songnen Plain of Northeast China. Pedosphere. 23(4): 472-481. |
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