干旱地区农业研究2017，Vol.35Issue(6)：244-251,8.DOI:10.7606/j.issn.1000-7601.2017.06.35
冻融对伊犁草地土壤水稳性大团聚体的影响
Effects of freezing and thawing on soil water stable aggregates in Yili grassland
摘要
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 siev-ing method.After simulating water rate of soil aggregates and conducting freeze-thaw tests at laboratory,the weight of dif-ferent 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 stabili-ty.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-sta-ble aggregates of 4~2 mm and 2~1 mm size fractions had no significant changes.关键词
水稳性大团聚体/草地土壤/冻融作用/湿筛法/冻融循环次数/冻结温度Key words
water stable aggregate/grassland soil/freezing and thawing/wet sieving method/freeze-thaw cycles/freezing temperature分类
农业科技引用本文复制引用
徐俏,崔东,王兴磊,朱振华..冻融对伊犁草地土壤水稳性大团聚体的影响[J].干旱地区农业研究,2017,35(6):244-251,8.基金项目
伊犁师范学院污染物化学与环境治理重点实验室开放课题科研项目资助(2016HJZD05) （2016HJZD05）
