ZHANG Juanjuan,SHAN Lishan,YANG Caihong,et al.Soil Moisture Dynamics of Reaumuria soongorica shrubs in Loess Hill and Gully region[J].Research of Soil and Water Conservation,2015,22(04):29-33.
黄土丘陵沟壑区红砂灌丛土壤水分动态研究
- Title:
- Soil Moisture Dynamics of Reaumuria soongorica shrubs in Loess Hill and Gully region
- 分类号:
- S152.7
- 摘要:
- 土壤水分是黄土丘陵区植被成活与正常生长的关键因素，对黄土丘陵沟壑区不同坡位红砂灌丛土壤水分动态进行了研究，结果表明：不同坡位土壤容重均随土层深度增加呈先增加后缓慢减小的变化趋势，不同坡位的持水量表现为：上坡 > 下坡 > 中坡。土壤含水量季节变化表现为不明显的“双峰”曲线，6月份第一次达到最大值，8月略有增加。根据红砂土壤水分变化情况和植物根系吸水状况，土壤水分的垂直变化可分为3个层次：土壤水分活跃层、次活跃层和相对稳定层。黄土丘陵沟壑区各月份均存在着不同程度的土壤干层，其中月份4月土壤干层最明显，而各月0—20 cm土层土壤干层最严重，因此，在黄土丘陵沟壑区4月进行造林，应进行适当灌溉以满足苗木对水分需求，且在雨季造林时密度不宜过大。
- Abstract:
- Soil moisture is the key factor for the growth and survival of vegetation in the loess hilly region. Soil moisture dynamics of Reaumuria soongorica population was monitored under different slope positions in the loess hill and gully region in Gansu Province of northwest China. The results showed that:(1) soil bulk density tended to increase at first and then decreased with increase of soil depth in different slope positions, the water holding capacity decreased in the order:upper slope > down slope > mid slope:(2) seasonal changes of soil moisture were expressed as dual peaks curve, and reached to the maximum at the first time in June, then increased a bit in August, according to soil moisture changes and plant root water absorption conditions, the vertical variation of soil moisture would be divided into three levels:active layer, less active layer and relative stable layer; (3) there were various degrees of dry soil layers in each month in loess hilly region, Dry soil layer is the most obvious in April and in the soil depth of 0—20 cm. Therefore, it is necessary to appropriately irrigate in April in the loess hilly and gully region when afforestation was carried out, and the density of planted trees should not be too large when afforestation was launched in rainy season.
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备注/Memo
收稿日期:2014-08-27;改回日期:2014-10-08。
基金项目:国家自然科学资助项目（41361100，31360205，41461044，31460180）；甘肃农业大学国家级大学生创新创业训练计划项目（201310733016）；国家国际科技合作专项（2012DFR30830）；甘肃省科技支撑计划项目（1204NKCA084）
作者简介:张娟娟(1990-),女,甘肃天水市人,在读本科生,主要研究方向为荒漠植物生理生态。E-mail:1123596649@qq.com
通讯作者:单立山(1975-),男(蒙古族),湖南衡阳市人,博士后,副教授,主要从事荒漠植物生理生态等方面研究。E-mail:shanls@gsau.edu.cn