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| DOI：10.13522/j.cnki.ggps.20180074 |
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| Spatiotemporal Variation of Soil Temperature within a Corn Field in Black Soil |
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LIU Jilong, LIU Lu, FU Qiang, ZHANG Lingling, LI Jiawen, TAN Siyuan
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1. School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China；2. Key Laboratory of Effective Utilization of Agricultural Water Resources, Ministry of Agriculture, Harbin 150030, China；3. College of Science, Northeast Agricultural University, Harbin 150030, China
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| Abstract: |
| 【Objective】 The aim of this work is to unravel the mechanisms underlying the spatiotemporal variation of soil temperature within a corn field grown in the black soil in north China in attempts to provide guidance to agronomical management. 【Method】 The experiment was conducted in a 96 m×96 m plot of corn field in Xiangyang experimental site in Harbin, Heilongjiang province. There were 32 observation points in the plot, from which we measured the change in soil temperature at different growth stages and then analyzed the data statistically.【Result】 During the growth season, the mean soil temperature at different depths increased firstly followed by an decrease. Temporal variation in the temperature depends on soil depth, with the temperature at 5 cm remaining almost unchanged while those at 10 cm and 25 cm depth increasing first followed by a decrease; the spatial correlation of soil temperature existed medium spatial correlation at the filling stage on 5 cm soil depth and the jointing stage on 10 cm soil depth, and it had strong spatial correlation on the other stages, the tendency to change the spatial variability of soil temperature was no obvious on 5 cm and 15 cm soil depth, increased firstly then decreased on 10 cm and 20 cm soil depth, and decreased firstly then increased on 25 cm soil depth. 【Conclusion】The soil depth and time have significant influence on the spatial variability of soil temperature in the research area. |
| Key words: black soil region; farmland; soil temperature; spatial and temporal variability |
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