稳定的和氧同位素变化的特征在不同土地覆盖下的土壤水中,在地区域的不同土地覆盖下
Lu Zhao1,2, Yun-di Hu1,2, Zhong-Fa Zhou1,2
1School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China.
Ying yong sheng tai xue bao = The journal of applied ecology
|September 1, 2025
概括
土地覆盖面显著影响了土壤水同位素在地地区. 草地蒸发最少,裸露土地蒸发最多,这是稳定同位素分析和lc超值值所表明的.
科学领域:
- 水文学的水文学
- 环境科学 环境科学
- 同位素地球化学 同位素地球化学
背景情况:
- 了解土壤水的稳定同位素 (和氧) 对于岩水文过程至关重要.
- 不同的土地覆盖面影响这些敏感地区的透,运输和水资源管理.
研究的目的:
- 为了分析在一个地区域的各种土地覆盖下土壤水中的稳定同位素变化 (δ2H, δ18O, lc-excess).
- 揭示土地覆盖对土壤水补充,蒸发和整体水循环的影响.
主要方法:
- 从2021年5月到2022年4月,定期对土壤水 (0-50厘米) 和降雨量进行实地采样.
- 在四种土地覆盖类型 (赤裸,耕地,草原,灌木) 的土壤水中分析和氧同位素.
- 将同位素数据与降水数据进行比较,并计算lc-excess以评估蒸发.
主要成果:
- 降水同位素呈现季节性变化,冬季价值较高. 当地的降水线表明温暖,潮湿的季风气候.
- 土壤水主要由降水充电,显示季节性同位素转移,最明显的是在10厘米深度.
- 蒸发效应在10厘米深处最强,赤裸的土地蒸发率最高,草原蒸发率最低,这是lc-excess值所反映的.
结论:
- 土地覆盖面显著影响土壤水稳定同位素的组成和在岩环境中的蒸发率.
- 该lc-excess值作为一个有效的指标,用于量化不同土地覆盖面下的土壤水蒸发.
- 这些发现为水资源利用和卡斯特地区的生态建设提供了理论基础.
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