新疆準(zhǔn)噶爾盆地荒漠草地水源圈植物群落退化格局
[Abstract]:The nomadic herdsmen's settled grazing is the main grazing method at present, leading to the widespread existence of the water source circle in the grassland in arid and semi-arid areas of northern China. From the end of May to the beginning of June 2014, in the desert grassland of northern Xinjiang, a typical pasture water source is the center. Six sampling distances of 50100200400800 and 1200 m were set in 8 directions for sampling of plant communities. Based on the analysis of plant community composition, species importance, richness, community coverage, height and aboveground biomass, it is expected to provide scientific basis for the restoration and sustainable management of degraded ecosystems in desert grassland. The results showed that with the decrease of the distance from the water point and the increase of grazing intensity, the plant community characteristics of desert grassland showed obvious gradient change, the dominant degree of Artemisia botanica decreased gradually, and the dominant degree of 1-year-old plant gradually increased. The species richness of plant community, perennial herbaceous plant and annual herbaceous plant gradually increased, the total coverage of community decreased gradually, There was a significant positive correlation between the coverage of Artemisia botanica and Artemisia botanica. The dominance of the annual plant and the poisonous plant camellia increased near the water point, which indicated that grazing resulted in the degradation of the aboveground plant community near the water source. Therefore, the development of nomadic settlement in this area may lead to the emergence of a large number of water resources, which may aggravate the degradation of desert grassland.
【作者單位】: 中國(guó)科學(xué)院新疆生態(tài)與地理研究所干旱區(qū)生物地理與生物資源重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);伊犁哈薩克自治州氣象局;
【基金】:國(guó)家重點(diǎn)基礎(chǔ)研究計(jì)劃項(xiàng)目(2014CB954204) 國(guó)家自然科學(xué)基金項(xiàng)目(31300390) 中國(guó)科學(xué)院西部之光西部博士項(xiàng)目(XBBS201309)和中國(guó)科學(xué)院特聘研究員計(jì)劃項(xiàng)目(2011T1Z42)資助
【分類號(hào)】:S812
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