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Effects of density on seedling survival and growth of an endangered species Myricaria laxiflora

Fangqing Chen 1, 2 , Gaoming Xiong 1, Zongqiang Xie 1, *   

  1. 1 Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093
    2 Graduate School of the Chinese Academy of Sciences, Beijing 100049
  • Received:2005-02-03 Online:2005-07-20
  • Zongqiang Xie

Myricaria laxiflora, distributed along the riverside of the Yangtze River in the Three Gorges area, lost its habitats and became an endangered species in 2003 due to the water storage of the Three Gorges Project. In order to understand whether density plays an important role in population self-modulation, we conducted an outdoor experiment which included five density treatments in the Center for Ecological and Environmental Research of China Three Gorges University. The changes of seedling death, below-ground seedling biomass, above-ground seedling biomass, total seedling biomass, number of branches, root depth, and length of first grade branch in different density treatments were examined in our experiment. The results showed that seedling survival rate decreased with increase of seedling density, and was reduced significantly when seedling density was greater than 250 ind./m2. Total seedling biomass, above-ground seedling biomass and below-ground seedling biomass differed noticably between density treatments. The correlation coefficient between above-ground biomass and density was bigger than that between below-ground biomass and density. Also, the number of branches, root depth and length of first grade branch decreased significantly with in-creases of seedling density, but number of branches responded more sensitively to density than length of branch and root depth. These results indicated that seedling density significantly stressed seedling survival and growth in Myricaria laxiflora, especially the growth of above-ground parts, and that density played an important role in population self-modulation and stability maintenance. The relationship of total biomass and below-ground biomass with other parts of seedlings were also explored with regression to understand theimpact of density on the growth of different parts of seedlings and to find proper density for population re-construction and management. We suggest that the density of 250 ind./m2 was the limit for population recon-struction.

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[1] GUAN Jun-Feng LI Guang-Min. The Physiological Effects of Calcium on Ethylene Biosynthesis and Signal Transduction in Plants[J]. Chin Bull Bot, 2000, 17(05): 413 -418 .
[2] Juan Wang,Yaxin Zhai,Aiqin Zhang. Temporal variation of plant sexes in a wild population of Tulipa sinkiangensis over seven years[J]. Biodiv Sci, 2018, 26(5): 519 -526 .
[3] CHANG Hong-Li, REN Yi, FENG Lu-Tian. Morphological observations on metamorphosed sepals in Anemone rivularis var. flore-minore (Ranunculaceae)[J]. J Syst Evol, 2005, 43(3): 225 -232 .
[4] Xie Zongqiang, Chen Weilie. The Remaining Evergreen Broadleaved Forest and Its Significance in The Three Gorges Reservoir Area[J]. Chin J Plan Ecolo, 1998, 22(5): 422 -427 .
[5] Juan Yan, Haijia Chu, Hengchang Wang, Jianqiang Li. Genetic structure and diversity of Medicago lupulina populations in northern and central China based on EST-SSRs markers[J]. Biodiv Sci, 2008, 16(3): 263 -270 .
[6] KONG Hong-Zhi, LIU Jian-Quan. Karyomorphology of the genus Pomatosace Maxin. (Primulaceae)[J]. J Syst Evol, 1999, 37(5): 445 -450 .
[7] Chen Zuo-zhong, Huang De-hua. Seasonal Variations of Nutritional Composition of 9 Range Plants in Stipa grandis Steppe[J]. Chin J Plan Ecolo, 1989, 13(4): 325 -331 .
[8] Qiong Wu, Fang Liu, Shaohui Li, Guoli Song, Chunying Wang, Xiangdi Zhang, Yuhong Wang, David Stelly, and Kunbo Wang. Uniqueness of the Gossypium mustelinum Genome Revealed by GISH and 45S rDNA FISH[J]. J Integr Plant Biol, 2013, 55(7): 654 -662 .
[9] LIAO Li-Ping, MA Yue-Qiang, WANG Si-Long, GAO Hong, YU Xiao-Jun. Decomposition of Leaf Litter of Chinese Fir and in Mixture with Major Associated Broad-leaved Plantation Species[J]. Chin J Plan Ecolo, 2000, 24(1): 27 -33 .
[10] Rong LI,Jun WEN. Phylogeny and biogeography of Asian Schefflera (Araliaceae) based on nuclear and plastid DNA sequences data[J]. J Syst Evol, 2014, 52(4): 431 -449 .