热带地理2015，Vol.35Issue(3)：416-421,6.
广西不同石漠化程度下典型植物水分来源分析
Water Sources of Typical Plants in Different Rocky Desertification Grades in Guangxi
摘要
Abstract
Using the stable isotope technique and water potentials, we research the water sources of typical plants in Guangxi and their respond to rocky desertification in three different rocky desertification grades. Results show that: Plant water potential and carbon isotope reduce with the increase of rocky desertification. No significant difference is found between the two dominant species both in water potential and carbon isotope in different rocky desertification areas. In slight and moderate rocky desertification area, an average of >70% of water for the two species comes from soil water, where soil is scattered only in rock fractures and is underlain by rigid carbonate rock. In intense rocky desertification area,V. negundomainly uses rainwater which storedin fissures, andA. trewioidesrelies on a mixture of soil water and rainwater, which account for 57.6% and 42.4% of the total, respectively. These two deciduous shrub species use more previous rainwater (>40%) and little recent rainwater in intense rockydesertification area. Soil water is the important water sources for plant growth in rocky desertification area. Water quantity that plant uptake from shollow fractured rock zone is increased gradually in intense rocky desertification area. Plants have thesame water use strategy against rocky desertification, such as low water potential and photosynthetic rate, high water use efficiency, and change of water sources.关键词
石漠化/水分利用策略/水分来源/稳定同位素/岩溶/优势灌木Key words
rocky desertification/water use strategy/water sources/stable isotope/karst/dominant shrub分类
农业科技引用本文复制引用
邓艳,蒋忠诚,李衍青,胡阳..广西不同石漠化程度下典型植物水分来源分析[J].热带地理,2015,35(3):416-421,6.基金项目
国家自然科学基金项目(40902074、41471447) （40902074、41471447）
中央级公益性科研院所基本科研业务费专项资金(YWF201401) （YWF201401）
