内蒙古典型草原小叶锦鸡儿灌丛化对水分再分配和利用的影响

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 内蒙古典型草原小叶锦鸡儿灌丛化对水分再分配和利用的影响 DOI: 10.5846/stxb201306051359 作者: 作者单位: 云南财经大学,北京师范大学,云南财经大学 作者简介: 通讯作者: 中图分类号: 基金项目: 国家杰出青年科学基金（41025001）；云南财经大学科研基金引进人才科研启动费项目（YC2013D15）；中央高校基本科研业务费和长江学者和创新团队计划（IRT1108）；中央高校基本科研业务费专项资助（2012CXQT07） Effects of shrub (Caragana microphalla Lam.) encroachment on water redistribution and utilization in the typical steppe of Inner Mongolia Author: Affiliation: Yunnan University of Finance and Economics,Beijing Normal University, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:灌丛化是全球草原地区存在的主要环境问题。通过对内蒙古典型草原区小叶锦鸡儿灌丛和草地斑块冠层降雨再分配、地表径流、土壤含水量的对比观测，研究了小叶锦鸡儿灌丛化对该区水分再分配和利用的影响。结果表明，灌丛和草地斑块的冠层截留量分别占降雨量的20.86%和7.88%，灌丛和草地斑块的平均地表径流系数分别为5.95%和17.19%。土壤含水量观测结果显示，0-60 cm土层中，降雨事件过程中，灌丛斑块较草地斑块能捕获更多水分，灌丛斑块植被冠层下方土壤含水量高于草地斑块；而在雨后无有效降水补充土壤水分的前提下，0-60 cm土层中，灌丛斑块土壤水分蒸散发量高于草地斑块，其中0-10 cm 土层中灌丛斑块土壤水分蒸散发速率低于草地斑块，10-60 cm 土层中灌丛斑块土壤水分蒸散发速率高于草地斑块。研究认为，在水分为关键性限制因子的干旱半干旱区，小叶锦鸡儿灌丛化过程增加草原生态系统中水分分布的空间异质性，灌丛斑块能捕获、利用更多水分以维持更多的生物量。 Abstract:Shrub encroachment is the main environment problem at the steppe region on the earth. This study observed rainfall redistribution composition of plant canopy, surface runoff, and soil moisture content at the shrub and interspace grass patches respectively, analyzed effects of shrub encroachment on water redistribution and utilization in the typical steppe which encroached by Caragana microphalla Lam. (C. microphalla) in Inner Mongolia. Results showed that the average canopy interception was 20.86% and 7.88% for shrub and interspace grass patches respectively, and the average surface runoff coefficient was 5.95% and 17.19% at shrub and interspace grass patches respectively. Shrub patches had greater water capability than intersapce grass patches in the same rainfall event, so soil moisture content under the canopy of shrub patches was much greater than intersapce grass patches after rainfall events in the 0-60 cm soil layers; soil evapotranspiration below the canopy of shrub patches was much greater than grass patches in the 0-60 cm soil layers, the evapotranspiration rate below the canopy of shrub patches was much lower than interspace grass patches in the 0-10 cm soil layers, but it was much greater than intersapce grass patches in the 10-60 cm soil layers. This study suggested that that shrub encroachment increased spatial heterogeneity of water distribution in grassland ecosystem at the arid and semiarid region where water was one of the key restriction factor, shrub patches could capture and utilize more water to produce more biomass than interspace grass patches. 参考文献 相似文献 引证文献