| Diurnal variation of respiration of reconstructed soil masses and its hydrothermal influence factors |
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| DOI：10.7606/j.issn.1000-7601.2020.02.35 |
| Key Words: soil respiration reconstituted soil masses hydrothermal factor diurnal variation |
| Author Name | Affiliation | | ZHANG Jian | School of Environmental Science and Engineering, Chang'an University, Xi’an, Shaanxi 710064, China | | LEI Na | Shaanxi Provincial Land and Engineering Construction Group Co., Ltd, Xi’an, Shaanxi 710075, China
Institute of Soil and Water Conservation, Northwest A＆F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Four kinds of reconstructed soil mass in the barren beach were selected as the research objects. The soil carbon flux measurement system (LI-8100) was used to monitor the soil respiration and hydrothermal factors of the reconstructed soil mass in situ, and the seasonal respiration changes of the reconstructed soil mass and its components were analyzed. The results showed that the daily changes of soil respiration for the four reconstructed soil masses showed a single\|peak curve, and the patterns of daily changes for soil respiration were basically the same. The lowest value during the observation period appeared at 6∶00 or 20∶00, and the highest value appeared at 10∶00, 12∶00, or 14∶00. The soil respiration values of the four reconstituted soil masses reached the maximum and minimum values during the experimental observation period in August and December, respectively, and the daily variation range of the four reconstituted soil masses during the observation period. Among them, the maximum values of reconstructed soil masses with meteorite, shale, sand, and soft rock were 9.88, 10.47, 14.94, and 12.19 μmol·m-2·s-1,respectively, the minimum values were 0.11, 0.08, 0.10, and 0.00 μmol·m-2·s-1.The order was as sand>shale>soft rock>meteorite. The four factors of soil temperature (index model), soil volume water content (quadratic model), soil temperature, and water content (power\|index model) can explain the daily variation of soil respiration. However, the explanatory power was different, the explanatory power of the two\|factor model was generally higher than 50.0%, and the interpretation ability of temperature in the single factor model was significantly higher than that of water.Under the fitting of three kinds of models, the hydrothermal influence factor of the addition of meteorite to reconstruct the soil mass had the lowest ability to interpret the diurnal variation of soil respiration (77%~97%). Under the exponential model and the power\|exponential model, the soil hydrothermal influence factor of the addition of meteorite to reconstruct the soil mass had the lowest ability to interpret the diurnal variation of soil respiration (41%~96% and 77%~97%). Under the quadratic curve model, the soil water content of adding the shale reconstituted soil mass had the highest ability to interpret the diurnal variation of soil respiration (28%~53%). |
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