Bio-geomorphologic Growth Process of Tamarix nabkha in the Hotan River Basin of Xinjiang
Received date: 2006-03-28
Revised date: 2007-04-10
Online published: 2007-05-25
Supported by
National Natural Science Foundation of China, No.40461002; Science Research Program for College and University in Xinjiang Uygur Autonomous Region, No.XJEDU2004I35
The characteristics of Tamarix shrub's plant ecology, community and environment and its regularities of distribution in space have been investigated in the Hotan River basin of Xinjiang. The shape data of 223 Tamarix nabkhas have been measured, and the structural characteristics of 4 Tamarix nabkha's sand driving wind have been observed at two field observational points. Based on the shape data surveyed and the sand flow materials observed, models of nabkhas have been made according to the proportion. In the wind tunnel, the flow patterns of different shapes of nabkhas have been imitated separately. The results indicated that Tamarix ecological type in the study area belongs to tugaic soil habitat which is based on soil of Populus and shrub forest. This habitat type can be further divided into three sub-habitats of juvenile, mature and post-mature Populus forests, in which Tamarix eco-geographical community is sequential succession. The change of ecological characteristics of Tamarix community in different sub-habitats induces variation of disturbance to sand flow and sand aggregation capability by Tamarix shrub in different stages. Therefore, the development of Tamarix nabkha presents phased succession. Compared with ecological characteristics and nabkha shapes of Phragmites and Alaghi, Tamarix shrubs can more intensely perturb wind-borne sand movement on the ground because of its longer life expectancy, the rigid shoot lignified, stool germination easily with endurance to be buried by sand and resistance to deflation. The wind speed section at the top of Tamarix nabkha is different from nabkhas of Phragmites and Alaghi.
Key words： Tamarix; nabkha; biological geomorphology; Hotan River basin
LI Zhizhong, WU Shengli, WANG Xiaofeng, HE Mudan,GE Lin, MU Hetaer, XU Guoqiang . Bio-geomorphologic Growth Process of Tamarix nabkha in the Hotan River Basin of Xinjiang[J]. Acta Geographica Sinica, 2007 , 62(5) : 462 -470 . DOI: 10.11821/xb200705002
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