| Effects of freezing and thawing on soil water stable aggregates in Yili grassland |
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| DOI：10.7606/j.issn.1000-7601.2017.06.35 |
| Key Words: water stable aggregate grassland soil freezing and thawing wet sieving method freeze-thaw cycles freezing temperature |
| Author Name | Affiliation | | XU Qiao | Key Laboratory of Pollutant Chemistry and Environmental Treatment, College of Chemistry & Environmental Sciences, YiLi Normal University, Yining, Xinjiang, 835000, China
College of Geography Science and Tourism, Xinjiang Normal University, Urumqi, Xinjiang 830054, China | | CUI Dong | Key Laboratory of Pollutant Chemistry and Environmental Treatment, College of Chemistry & Environmental Sciences, YiLi Normal University, Yining, Xinjiang, 835000, China
College of Biology and Geography, Yili Normal University, Yining, Xinjiang 835000, China | | WANG Xing-lei | Key Laboratory of Pollutant Chemistry and Environmental Treatment, College of Chemistry & Environmental Sciences, YiLi Normal University, Yining, Xinjiang, 835000, China | | ZHU Zhen-hua | Key Laboratory of Pollutant Chemistry and Environmental Treatment, College of Chemistry & Environmental Sciences, YiLi Normal University, Yining, Xinjiang, 835000, China |
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| Abstract: |
| This study mainly took the soil of grassland in Yili as the research object. We sampled the 0～20 cm surface soil of Tuohulasu grassland in Yining County and obtained soil aggregates in different particle fraction via dry sieving method. After simulating water rate of soil aggregates and conducting freeze-thaw tests at laboratory, the weight of different size fraction water-stable aggregates were measured via wet sieving method. The results showed that: (1) Initial moisture content is the key factor affecting soil water stable aggregates. With the increase of soil initial moisture content, four size fraction water-stable aggregates, including＞5 mm, 5～4 mm, 4～2 mm and 2～1 mm, gradually declined, or declined after an increase; water stable aggregates of 1～0.5 mm and 0.5～0.25 mm size fraction showed the changing trend of increasing first and then decreasing, or increase first, then decline and then increase again. (2) The frequency of freeze-thaw cycles is an important factor affecting soil water-stable aggregates. With an increasing frequency of freeze-thaw cycles, each size fraction of water stable aggregates showed different patterns. Water stable aggregates in＞1 mm size fraction had overall decreasing trend, while other two size fractions of the aggregates including 1～0.5 mm and 0.5～0.25 mm showed an increasing trend. (3) Freezing temperature is another important factor affecting soil water stability. While the temperature decreased, the water stable aggregates of >5 mm and 5～4 mm size fraction also decreased, however, water stable aggregates of 1～0.5 mm and 0.5～0.25 mm size fractions increased significantly, and water-stable aggregates of 4～2 mm and 2～1 mm size fractions had no significant changes. |
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