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| Influence of Altitude on Soil Microenvironment Modification of Thylacospermum caespitosum |
| Liu Xiaojuan1,2, Chen Nianlai1, Tian Qing2 |
1. College of Resource and Environmental Science, Gansu Agricultural University, Lanzhou 730070, China;
2. College of Forestry, Gansu Agricultural University, Lanzhou 730070, China |
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Abstract Two Thylacospermum caespitosum communities at altitudes of 3 762 m and 4 137 m in the alpine area of Gansu were chosen as studied sites. Nine Thylacospermum caespitosum individuals with 50 cm diameter at each altitude were chosen, the soil microenvironment conditions under T. caespitosum of each site were studied, at the same time, nine open areas in same diameter without cushion were chosen as controls. The nutrients, water content and temperature of soil under each selected cushions were determined and compared with those of open area without cushions. The results showed that at both site, T. caespitosum improved the soil nutrient contents under their canopies, improved the water condition of soil beneath them, and maintained relatively constant temperature environments under their canopies, they increased the extreme low temperature and decreased the extreme high temperature of soil beneath them, and made the soil temperature under their canopies not to change much during a day. The study showed that with the increasing of the altitude, the environmental stress increased, the nutrients, water content and temperature conditions of soil at 4 137 m were all lower than those of soil in 3 762 m. This indicated that the soil microenvironment modification of T. caespitosum increased with environment stress.
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Received: 05 November 2013
Published: 20 January 2014
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Corresponding Authors:
陈年来，chennl@gsau.edu.cn
E-mail: chennl@gsau.edu.cn
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2014, Vol. 34 
