Keywords :
Dry tropical forest,
Fire,
Geostatistics,
Soil nitrogen,
Transformations,
Spatial heterogeneity
บทคัดย่อ :
Spatial patterns of soil nitrogen (N) transformations were examined using geostatistical analysis in three adjacent
stands with different fire history (0, 10 and 35 years since the latest fire, respectively) in a dry tropical forest in
Thailand. A larger pool of total inorganic N and a faster rate of N mineralization were recorded in the stand with
longer fire prevention. At the spatial scale analyzed, the proportion of spatially dependent variance to the total
variance of N mineralization and nitrification increased from 0.39 to 0.73, and from 0.40 to 0.77, respectively, with
the time since the latest fire. The spatial autocorrelation ranges of N mineralization and nitrification decreased from
>=9.0 to 3.28 m, and >=9.0 to 2.77 m, respectively, with the time since the latest fire. These results suggested that fire
history affected not only the level of available soil N, but also the spatial heterogeneity of soil N transformations,
presumably due to the difference in plant influences on soil.
เอกสารอ้างอิง :
Hirobe, M., Tokuchi, N., Wachrinrat, C., & Takeda, H. (2003). Fire history influences on the spatial heterogeneity of soil nitrogen transformations in three adjacent stands in a dry tropical forest in Thailand. Plant and soil, 249(2), 309-318.
