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《Journal of Zhejiang A & F University》 2014-05
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Soil-water utilization levels in a Cyclobalanopsis glaucoides virgin forest on the Central Yunnan Karst Plateau

ZHU Xiuqin;FAN Tao;GUAN Wei;QIN Na;School of Tourism and Geographical Sciences, Yunnan Normal University;  
To explain the water utilization mechanism of a Cyclobalanopsis glaucoides virgin forest on the Central Yunnan Karst Plateau in southwest China, and its adaptive strategies in an arid karst habitat, a stable isotope technique was featured to determine soil-water levels utilized by plants. Several dominant plant species(C. glaucoides, Olea yuennanensis, and Pistacia weinmannifolia) were selected and tested with oxygen isotopes of water on stems and soils from the virgin forest. Using IsoSource model calculations the contribution of different water samples was determined. Results revealed that water utilization positions and proportions for C.glaucoides in the primeval forest and its accompanying trees varied in time and space, and were competitors for water. During dry seasons, C. glaucoides, mature O. yuennanensis, and young P. weinmannifolia used soil water from depths of 55-115 cm with more groundwater used for mature C. glaucoides and mature P. weinmannifolia.In rainy seasons, because of the precipitation, 100% of the mature C. glaucoides, 33.3% of the O. yuennanensis, 66.0% of the P. weinmannifolia, and 37.4% of the young P. weinmannifolia used the 20-55 cm soil-water level.
【Fund】: 国家自然科学基金资助项目(41261007);; 国家重点基础研究发展计划(“973”计划)前期专项(2009CB426312);; 云南省自然科学基金资助项目(2011FZ077)
【CateGory Index】: S718.5
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