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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (1): 123-133.DOI: 10.7522/j.issn.1000-694X.2021.00129

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Responses of growth and biomass allocation of Artemisia ordosica to desertification in Mu Us Sandyland

Yingtao Sun1(), Yanpeng Yue1, Long Cheng1, Yingjun Pang1, Heju Zhao1, Bingqiang Fei1, Xiaomin Xiu1, Bo Wu1, Yuxing Zhao2, Lin Shi2, Jinjun He2, Xiaohong Jia1()   

  1. 1.Institute of Desertification Studies / Key Laboratory of Desert Ecosystem and Global Change / Institute of Ecological Conservation and Restoration,Chinese Academy of Forestry,Beijing 100091,China
    2.Ordos Forestry and Grassland Research Institute,Ordos 017000,Inner Mongolia,China
  • Received:2021-07-09 Revised:2121-10-09 Online:2022-01-20 Published:2022-01-28
  • Contact: Xiaohong Jia

Abstract:

The resource allocation pattern of plants can reflect the ecological adaptation strategies of plants to the environment. In this study, Artemisia ordosica a dominant semi-shrub in the Mu Us Sandyland was selected as the research object. The growth characteristics and biomass allocation law of A. ordosica in different degrees desertification (potential, slight, moderate, and severe) were systematically analyzed by the sample plot survey method. The results showed that: (1) With the intensification of desertification, the density of A. ordosica population per unit area and above-ground biomass decreased, and the mortality rate increased. (2) The intensification of desertification will promote the growth of A. ordosica individuals. The total above-ground biomass increased from 374.4 g·plant-1 (potential) to 2 999.6 g·plant-1 (severe) that year, increase by 701.18%; this During the process, the reproduction and distribution of A. ordosica increased significantly, and the nutrient distribution was significantly reduced (P<0.05). The reproduction and distribution of Art. The reproduction and distribution of A. ordosica reached 40.6% and 62.4% in the stage, which were much higher than the potential desertification stage. (3) The diameter, length and biomass of the vegetative branches and reproductive branches of A. ordosica increased with the increase of the degree of desertification, but the biomass of the vegetative branches of Art. The desertification stage is about 2.0 and 0.7 times the two. (4) Facing the intensification of desertification, the indicators (leaf biomass, stem biomass, ear biomass, leaf density and ear density) of A. ordosica vegetative branches and reproductive branch components showed an overall increasing trend, but A. ordosica The proportion of leaf distribution decreased significantly (P<0.05), and the proportion of stem distribution increased first and then decreased. The proportion of stem distribution for vegetative growth of A. ordosica in the mild desertification stage was the largest (41.1%), while the reproductive branch component in the ear (seed) The proportion of distribution continues to increase. Therefore, the development of desertification seriously affects the survival and development of A. ordosica populations, but the individual growth and biomass distribution patterns of A. ordosica will be adjusted and weighed as the degree of desertification intensifies. The individual growth strategy of A. ordosica will shift from vegetative growth. The main reproductive growth is transformed.

Key words: desertification, biomass, reproductive allocation, vegetative allocation, resource allocation pattern, trade-off

CLC Number: