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Regeneration pattern analysis of Quercus liaotungensis in a temperate forest
using two-dimensional wavelet analysis |
| Xiangcheng MI1,Jihua HOU2, |
| 1.State Key Laboratory
of Vegetation and Environmental Change, Institute of Botany, the Chinese
Academy of Sciences, Beijing 100093, China; 2.Key Laboratory for Silviculture
and Conservation, the Ministry of Education, Beijing Forestry University,
Beijing 100083, China; |
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Abstract This paper introduces the two-dimensional (2D) wavelet analysis as a general interrogative technique for the detection of spatial structure in lattice data. The 2D wavelet analysis detects components of hierarchical structure and displays the locational information of the components. Patches and gaps of different spatial scales in graphical presentation of wavelet coefficients can be linked to the local ecological processes that determine patterns at stand or landscape scales. Derived from the 2D wavelet transform function, the calculation of wavelet variance can reduce the four-dimensional data of wavelet coefficients to a two-dimensional wavelet variance function and quantify the contribution of the given scale to the overall pattern. We illustrate the use of the 2D wavelet analysis by analyzing two simulated patterns and identifying the regeneration pattern of the Quercus liaotungensis in a warm temperate forest in north China. Our results indicate that the recruitment of Q. liaotungensis occurs in an overlapping area between the patch of adult and canopy gap at scales of 45 m × 45 m―70 m × 70 m and 20 m × 20 m―30 m × 30 m. The regeneration pattern of Q. liaotungensis can be mainly ascribed to a trade-off between two ecological processes: recruitment around parent trees and the physiological light requirements of seedlings and saplings. Our results provide a general portrayal of the regeneration pattern for the dispersal-limited and shade-intolerant Quercus species. We find that the two-dimensional wavelet analysis efficiently characterizes the scale-specific pattern of Q. liaotungensis at different life-history stages.
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| Keywords
Halo wavelet
pattern analysis
Quercus liaotungensis
regeneration
scale
two-dimensional Mexican Hat wavelet
two-dimensional wavelet analysis
wavelet variance
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Issue Date: 05 December 2009
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