ZHANG Jinhu,WANG Naiang,NIU Zhenmin,et al.Spatiotemporal Dynamics of Soil Moisture of Tamarix laxa Land in the Mega-dunes of Badain Jaran Desert[J].Research of Soil and Water Conservation,2018,25(04):92-97.
巴丹吉林沙漠高大沙山柽柳地土壤水分时空动态
- Title:
- Spatiotemporal Dynamics of Soil Moisture of Tamarix laxa Land in the Mega-dunes of Badain Jaran Desert
- Keywords:
- mega-dunes; Tamarix laxa; soil moisture; Badain Jaran Desert
- 分类号:
- S793.5;S152.7
- 摘要:
- 为探索柽柳地土壤水分特征及其对降水事件的响应，采用EM50土壤水分检测系统及MAWS301自动气象站，监测了柽柳地及相似立地裸露沙山10—210 cm土壤体积含水量动态和区域降水量，并分析了两者的土壤水分基本特征、时空动态及其对降水事件的响应。结果表明：（1）柽柳地10—210 cm土壤含水量平均值为1.88%，稍高于裸露沙山（1.74%）水分；（2）柽柳地土壤水分呈浅层（10—70 cm）高、中层（70—150 cm）低、深层（150—210 cm）高的特点，且浅层稍低于裸露沙山水分（p>0.05），中层相近，深层明显高于裸露沙山（p<0.01）；（3）柽柳地各层次水分变异大，对极端降水事件敏感，平均变异率58.67%，是裸露沙山的4.26倍，降水入渗可达200 cm，而沙山不超60 cm。柽柳林地水分主要受降水影响，且柽柳的存在改变了降水再分配过程，促进了降水入渗的深度，使林地维持较高的含水量。
- Abstract:
- In order to explore the soil water characteristics and the response to extreme precipitation events, we used EM50 to monitor the 10—210 cm soil moisture dynamics of woodland and similar sites bare sand, and used MAWS301 automatic weather station to monitor regional precipitation. The basic characteristics, temporal and spatial dynamics of soil moisture and their response to precipitation had been analyzed. The results showed that: (1) the average soil moisture of Tamarix laxa land (10—210 cm) was 1.88%, which is slightly higher than that of bare sand (1.74%); (2) the soil water content of Tamarix laxa land was characterized as the high content in shallow layer (10—70 cm), low content in middle layer (70—150 cm) and high content in deep layer (150—210 cm), and the shallow layer was slightly lower (p>0.05), the middle layer was similar and the deep layer was significantly higher(p<0.01) compared with the bare sand; (3) the soil water of Tamarix laxa land had bigger variability and was sensitive to extreme precipitation events. The average soil moisture variability is 58.67%, which was 4.26 times higher than the sand; the precipitation infiltration was up to 200 cm in Tamarix laxa land, while it was less than 60 cm in the bare sand. The soil moisture of Tamarix laxa land was mainly affected by precipitation, moreover, the precipitation redistribution process was changed by Tamarix laxa, which promoted the depth of precipitation infiltration, and kept the higher soil moisture.
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备注/Memo
收稿日期:2017-08-10;改回日期:2017-09-07。
基金项目:国家自然科学基金（41530745，41371114，41361004）
作者简介:张进虎(1982-),男,甘肃会宁人,博士生、副研究员,主要从事同位素生态水文学研究。E-mail:115927526@qq.com
通讯作者:王乃昂(1962-),男,山东郓城人,博士,教授,博士生导师,主要从事气候变化与水循环、环境变迁与历史地理研究。E-mail:wangna@lzu.edu.cn