| 生物土壤与生态 |
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| Structure and Distribution Pattern of Artermisia Ordosica Population in Arid Region |
| WANG Ji-he, JIN Hu-jia, MA Quan-lin, ZHANG De-kui, LIU You-jun, X Bao-yi |
| Gansu Desert Control Research Institute & Key Laboratory of Desertification Combating, Lanzhou 730070, China |
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Abstract In order to investigate the size structure and spatial distribution pattern of Artermisia Ordosica population in arid region, three typical distribution areas of Artermisia ordosica were chose as sampling plots, they are Shapotou in Ningxia Hui Autonomous Region, Mingshazui in Gulang county and Zhazigoui in Minqin county of Gansu province. The population structure of Artermisia ordosica was analyzed through survival curve and size class; the distribution pattern of Artermisia ordosica was studied through mean crowding (m*),clumping index(I), patchiness index (m*/m), Cassie index (Ca), dispersal index(C), parameter of negative binominal (K); and the pattern scale was analyzed by two-term local variance. The results showed that the Artermisia ordosica population in Shapotou and Zhazigou was in a stable stage, while that in semi-fixed dune and fixed dune of Mingshazui was in a growth stage. The spatial distribution pattern of Artermisia ordosica population in different regions all were aggregation distribution, but there was difference in the cluster size. The cluster size in different regions ranked in order of Artermisia ordosica of semi-fixed dune in Mingshazui, that of fixed dune in Mingshazui, that of Shapotou and that of Zhazigou. The analysis of distribution pattern showed that there were difference pattern scales for the different sampling plots.
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Received: 14 October 2009
Published: 20 May 2010
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2010, Vol. 30 
