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《植物学报(英文版)》 2003-10
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Variations in Composition and Water Use Efficiency of Plant Functional Groups Based on Their Water Ecological Groups in the Xilin River Basin

CHEN Shi-Ping, BAI Yong-Fei, HAN Xing-Guo*(Laboratory of Quantitative Vegetation Ecology, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, China)  
Major plant species in the Xilin River Basin were grouped into six plant functional groups(PFGs) based on their water ecological groups: xerophytes, mesoxerophytes, xeromesophytes, mesophytes,hygromesophytes and hygrophytes. We surveyed the composition, d13C values and proline concentrationof PFGs in eight different plant communities along a soil moisture gradient. Results show that: (1) PFGsoccurred variously in eight steppe communities with different soil moisture status. In wetter habitats,hygromesophytes and hygrophytes were more abundant and accounted for the majority of abovegroundbiomass, whereas xerophytes and mesoxerophytes became more conspicuous in dryer habitats; (2) thenumerical order of the mean d13C values of PFGs is as follows: xerophytes (-26.38? = mesoxerophytes(-26.51? xeromesophytes (-27.02? mesophytes (-27.56? = hygromesophytes and hygro-phytes (-27.80?; (3) xerophytes maintained relative higher d13C values and water use efficiency (WUE) inhabitats of different water availability, whereas d13C values of xeromesophytes were more sensitive tochange in soil water availability; (4) From xerophytes to hygrophytes, their proline content markedly increased.Significantly positive correlations existed between proline and biomass or d13C values of different waterecological groups.
【Fund】: 国家重点基础研究发展规划项目(G2000018607);; 中国科学院知识创新工程重大项目(KSCX1-08);; 国家自然科学基金(90211012)。~~
【CateGory Index】: S718.5
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