[1]DUAN Guifang,SHAN Lishan,LI Yi,et al.Population Structure and Saptial Pattern of Reaumuria soongorica Population in Midwest Region of Gansu[J].Research of Soil and Water Conservation,2016,23(01):67-74.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
23
Number of periods:
2016 01
Page number:
67-74
Column:
Public date:
2016-02-28
- Title:
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Population Structure and Saptial Pattern of Reaumuria soongorica Population in Midwest Region of Gansu
- Author(s):
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DUAN Guifang, SHAN Lishan, LI Yi, DUAN Ya’nan, ZHANG Rong
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College of Forestry, Gansu Agricultural University, Lanzhou 730070, China
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- Keywords:
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population structure; static life table; survival curve; time series analysis; spatial distribution
- CLC:
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S722
- DOI:
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- Abstract:
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In order to reveal the distribution characteristics of Reaumuria soongorica population in ecological fragile areas in midwestern Gansu, based on the crown structure and static life table and survival curve, age structure and dynamics of Reaumuria soongorica population under three typical habitat conditions in the central and western regions of Gansu were studied, besides, the theory of distribution model and aggregation intensity index were applied to analyze the population distribution pattern. The results showed that Reaumuria soongorica population structure was obviously different under different habitat conditions.Ⅰ(0 cm < d ≤ 10 cm),Ⅱ(10 cm < d ≤ 20 cm) and Ⅲ(20 cm < d ≤ 30 cm) age classes of Reaumuria soongorica population were abundant in Piedmont Gobi, accounting for 87.01% of the total number of all age classes, there were no individuals over age class Ⅴ(40cm < d ≤ 50 cm), indicating that the population was in the growing stage; Reaumuria soongorica population individual number of age classesⅡ—Ⅵ(10 cm < d ≤ 60 cm) accounted for 75.34% and 85.09% of the total number of all age class individuals in the desert oasis transition zone and the loess hilly-gully region, respectively, and there were a certain number of older individuals, the population was in the stable stage; however, it was found that the seedling number was a few under different habitat conditions, the number of Ⅰage class individuals were significantly less than Ⅱ, Ⅲ age classes, there may be a problem in population renewal. Structure analysis showed that Reaumuria soongorica population presented a clumped distribution under different habitat conditions. Time series analysis showed that in the future the individuals of 2, 4, 6, 8 age classes will show a tendency of older individual increasing, the young plants are reducing and it is difficult to maintain the Reaumuria soongorica population stability under different habitat conditions. The increase of the artificial auxiliary seeding update and artificial nurture protects are the key to realize Reaumuria soongorica population update and recovery in ecological fragile areas in midwestern Gansu.