| Study on movement characteristics of soil temperature and salt during freeze-thaw period |
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| DOI：10.7606/j.issn.1000-7601.2016.02.23 |
| Key Words: cotton field, freeze-thawing, soil temperature, soil salt |
| Author Name | Affiliation | | ZHAO Yong-cheng | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | HUDAN·Tumarbay | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | MAHEMUJIANG·Aihemaiti | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHU Dong-qiao | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | LI Hui | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHAO Jing-hua | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHU Hai-qing | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| The interaction between soil temperature and soil salt movement during the freeze-thaw period was studied in an indoor laboratory and the field. The results indicated that the effect of air temperature on soil temperature was decreased with the depth increased. Before the thawing period, soil temperature appeared an increasing trend with soil depth, but exhibited an opposite tread after thawing period. Correlation of soil temperatures between adjacent layers was significant at the 0.01 level (2-tailed), and the decision coefficient was larger than 0.8. The correlation of soil temperature became decreased with the depth. The duration of the freeze-thaw period reached a length of 120 days, and the largest depth of frozen soil was about 80cm. The frozen soil was completely thawed at the first ten-day of March. The whole freeze-thaw period could be divided into three stages: the first stage was frozen zone development, the second one was stable frozen stage and the third was the thawing period, which fitted accurately with the function. The soil salt content presented an increasing trend firstly, and then became decreased with depth. The value of soil salt content in frozen zone was about 0.3%, which belonged to the non-salinization soil. There was a stable salt accumulation layer at the depth of 80～120 cm, which presented the characteristic of moderately and severely salinized soil. |
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