中文摘要：

植物水分来源取决于环境中有效水的分布及植物获取水分的能力.旱季,土层浅薄地区土壤水无法满足植物生长的需要,植物能否利用风化基岩层水分是其能否维持正常水分消耗的关键.本文综述了4种土层浅薄地区植物水分来源的研究方法,包括调查和分析植物根系生长与分布特征、监测地表以下各层次水分变化、监测并分析植物体水分指标季节变化以及运用稳定同位素技术区分植物水分来源,并进一步分析了各种方法的优势和局限性及其在我国西南喀斯特地区植物水分来源研究中的应用前景.

英文摘要：

Plant water source depends on the distribution of available water in the environment,and the capability of plants in capturing water.In dry season,the soil water in thin soil region cannot satisfy the demand of normal plant growth,and whether the plants can use the water stored in weathered bedrock is the key for them to maintain their normal water consumption.This paper reviewed the research methods for determining the plant water source in thin soil region,including investigating and analyzing the characteristics of root growth and distribution,monitoring the changes of water content at various depths below ground surface,monitoring and analyzing the seasonal variation of plant water status, and identifying the plant water source by stable isotope techniques.The advantages and disadvantages of these methods and their potential applications in tracing plant water source in karst region of Southwest China were discussed.