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[1]GAO Yan,DU Feng,WANG Yannan,et al.Interspecific Competition of Six Succession Series Species with Different Soil Moisture Treatments in Loess Hilly Region[J].Research of Soil and Water Conservation,2016,23(06):192-197.

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Interspecific Competition of Six Succession Series Species with Different Soil Moisture Treatments in Loess Hilly Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 06 Page number: 192-197 Column: Public date: 2016-12-28

Title:: Interspecific Competition of Six Succession Series Species with Different Soil Moisture Treatments in Loess Hilly Region

Author(s):: GAO Yan^1,2, DU Feng^1,4, WANG Yannan³, WANG Yue³, LI Weiwei³, SHI Huijun³; 1. Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, Shaanxi 712100, China;
2. University of China Academy of Sciences, Beijing 100049, China;
3. Northwest A & F University, Yangling, Shaanxi 712100, China;
4. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China

Keywords:: soil moisture; interspecific competition; succession series species; loess hilly region

CLC:: Q948

DOI:: -

Abstract:: Interspecific competition refers to the relationship between species competing for resources, which is critical to community succession and vegetation recovery. As an essential and important resource for growth, water exerts the significant effect on formation and development of interspecific relations. However, the interspecific competition for water in the hilly loess arid region was little known, where the water remained the main constraint resource for growth. Six succession series species were selected to study their competitive response to soil moisture change based on the pot experiments. The results showed that:(1) six species’ growth conditions with the different soil moisture treatments were not the same at both monoculture and pair-wise treatment, biomass and height of all five species showed a similar trend with soil moisture except for Setaria viridis, and the biomass of belowground varied more greatly than that of aboveground, interspecies competition had affected the growth of plants; (2) total competition intensity and pergram competition intensity similarly reflected the status of interspecies competiton, the competiton of S. viridis and Bothriochloa ischaemum was greater than its counterpart species Artemisia scoparia, Lespedeza dahurica in medium and high water conditions while the reverse pattern occurred in low water condition. Artemisia sacrorum’s competiton was lower than Artemisia giraldii with decrease of soil moisture. The competitiveness ranked as the order:L. dahurica, B. ischaemum > A. sacrorum, A. giraldii > S. viridis, A. scoparia under water stress, showing that the competition of late succession species was larger than succession mid-early stage and complying with the succession niche theory. Different plants had different optimal soil moisture. Competition asymmetry intensified the effects of water deficiency on the plant growth. Asymmetry of interspecies competition was caused by accessing resource asymmetry of relative and neighbor species. The plants’ tolerance ability gradually increased with decrease of soil moisture in the process of succession, thus prompting further community succession.

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