site type,Lycium ruthenicum,population; distribution pattern,lower reaches of Shiyang River ,"/> Distribution Patterns of Lycium ruthenicum Population in Different Site Types in Lower Reaches of the Shiyang River

Arid Zone Research ›› 2020, Vol. 37 ›› Issue (1): 178-184.

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Distribution Patterns of Lycium ruthenicum Population in Different Site Types in Lower Reaches of the Shiyang River

GUO Chun-xiu1, 2, 3, LIU Kai-lin3, MA Jun-mei1, 3, WANG Li-de3, HE Fang-lan2, 3, ZHAO Peng2,3, FU Gui-quan2, 3 , ZHAO Yan-li3   

  1. 1. State Key Laboratory, Breeding Base of Desertification and Aeolian Sand Disaster Combating, Wuwei 733000,Gansu,China;
    2. Minqin National Station for Desert Steppe Ecosystem Studies, Minqin 733300, Gansu,China;
    3. Gansu Institute of Desert Control Research, Lanzhou 730070,Gansu,China

  • Received:2019-04-08 Revised:2019-05-21 Online:2020-01-15 Published:2020-01-15

Abstract:

Based on the methods of surveyed sample plots and adjacent lattice sampling, 8 indexes were adopted as the diffusion coefficient (C), cluster index (I), negative binomial parameter (K), agglomeration coefficient (Ca), average crowding index (m*), aggregation index (G), Moristia index (Iδ) and Green index (IG). These indexes were used to study the distribution patterns and aggregation intensity of Lycium ruthenicum population in different site types in the lower reaches of the Shiyang River. The results showed that there were many L.ruthenicum individuals in the saline-alkaline land and sandy land, and the aggregation level was relatively high. However, the plants of L.ruthenicum in gravel land and fixed and semi-fixed sandy land were relatively less, and the aggregation level was relatively low. The L.ruthenicum population was distributed in an aggregation way in saline-alkaline land and sandy land, and the plants in the fixed and semi-fixed sandy land and gravel land were relatively less and their aggregation level was low; The L. ruthenicum population at different development stages was holistically distributed in an aggregation way, and with the increase of tree-age, the L.ruthenicum population changed from aggregation distribution to a uniform distribution.

Key words: site type')">

site type, Lycium ruthenicum, population; distribution pattern, lower reaches of Shiyang River