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《Arid Land Geography》 2018-05
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Ecological parameters of a typical shrub in Tiaolaochi catchment in the upper reach of Heihe River

LI Wen-juan;HUANG Li-ping;ZHAO Chuan-yan;HU Dong-yu;WANG Qing-tao;Government Office of Dabancheng District;Institute of Modern Forestry,Xinjiang Academy of Forestry Science;State Key Laboratory of Grassland and Agro-Ecosystem,College of Pastoral Agriculture Science and Technology,Lanzhou University;College of landscape and Ecological Engineering,Hebei University of Engineering;  
Qilian Mountains is the water conservation area of the Heihe River,Shiyang River and Shule River in northwest China. The Heihe River as the second longest inland river in China has been paid more attention due to its eco-environmental problems. These problems include the continuous decrease in the discharge water of the Heihe River,desertification,salinization and the increase of sand storms. Therefore,a series of conservation programs have been conducted for ecological environmental restoration in Qilian Mountains,especially in the upper reaches of the Heihe River. We selected Tianlaochi catchment in the upper reaches of the Heihe River as the study area and investigated the ecological parameters( i. e.,leaf area,leaf area index,specific leaf area) of a typical shrub species( Dasiphora fruticosa,Caragana jubata) during its growing period. Firstly,the investigation was carried out from May to September in 2014 and 2015. Secondly,we used the remotely sensed data,such as airborne Li DAR( Light Detection and Ranging) and high-resolution remote sensing image( Geoeye-1),to obtain the spatial distribution of shrub leaf area index. The results showed that the specific leaf area was fluctuated during the growing period. The leaf area and leaf area index of shrub were changed obviously,with a significant increase in June and July. However,the result tended to be stabilized in August. The leaf of shrub began to fall in September. With different hydrothermal conditions along the elevation gradient,the spatial distribution of leaf area index presented a great variety. The leaf area index of shrub was increased with the increase of elevation from 3 200 meter to 3 400 meter,nevertheless,it was decreased with an increase of elevation from 3 400 meter to 3 750 meter. The variation of leaf area index with elevation resulted from the combination of the precipitation and temperature. The retrieved parameters will provide inputs for the distributed eco-hydrological model built in the subsequent research.
【Fund】: 国家青年基金项目(41605047);; 中国科学院战略性先导科技专项(XDA05050202)
【CateGory Index】: Q948
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