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| Age Structure and Dynamics of Salix psammophila Branches in Southern Edge of the Mu Us Sandy Land |
| Chen Guopeng1,2, Zhao Wenzhi1,3 |
1. College of Forestry, Gansu Agricultural University, Lanzhou 730070, China;
2. Institute of Forestry Sciences, Bailongjiang Forestry Management Bureau of Gansu Province, Lanzhou 730070, China;
3. Linze Inland River Basin Research Station/Key Laboratory Inland River Ecohydrology, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract Salix psammophila is a pioneer species in the Mu Us Sandy Land. Understanding the age structure and survival status of branches can provide insight into the senescence process of S. psammonphila. We surveyed and analyzed 342 branches of S. psammonphila in southern Mu Us Sandy Land. We estimated the survival curve, mortality curve, life expectancy of the branches, and other parameters of age structure. The results showed that the branches were characterized by the abundance of 3-year-old branches, and the age structure of branches was spindle shaped. The stationary life table of S. psammonphila branches indicated that the observed life expectancies were the highest in 1-year-old branches, while the mortality rate and disappearance rate were the highest in 5-year-old branches. The survival curve of S. psammonphila branches tended to be of Deevey-Ⅱ type. The survivability of the branches declined at young age and fluctuated at old age. The dynamic index of population size of Vpi' was close to zero under random disturbance, indicating that the age structure of the branches tended to be stable and was very sensitive to environment disturbance. The time sequence model predicted that the number of individuals increased in the coming 2, 4, 6 and 8 age classes, but the number in young individual deceased. It was assumed that S. psammonphila population would decline from a lack of recruitment of young individuals if appropriate action is not taken to protect and foster these plants. Therefore, we encourage appropriate pruning to rejuvenate S. psammonphila.
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Received: 10 November 2014
Published: 20 November 2015
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2015, Vol. 35 
