立地类型对干旱沙区梭梭人工林群落特征的影响

Effect of Site Types on Community Characteristics of Haloxylon ammodendron Plantation in Alax Desert

结合2014—2017年阿拉善干旱沙区梭梭人工林群落野外调查和GIS技术,研究了立地类型对梭梭人工林群落特征的影响。结果表明:(1)梭梭人工林立地类型质量等级排序为半固定沙丘>流动沙丘>石质土缓丘陵>石质土低山>砾石质戈壁荒漠。(2)不同立地类型的梭梭人工林成活率和盖度存在显著差异,半固定沙丘显著高于石质低山和石质土缓丘陵,但保存率差异不显著;不同立地类型人工林的成活率、保存率和盖度变化与立地类型质量等级排序一致。(3)梭梭人工林建设增加了半固定沙丘和流动沙丘草本层的植物种数量,但是对石质土缓丘陵、石质土低山和砾石质戈壁荒漠的植物种数量无显著影响。

In order to improve the survival rate of afforestation and the efficiency of vegetation restoration in the desert,it is essential to evaluate the suitability of afforestation under the different site types.The study determines the effect of site types on community characteristics of Haloxylon ammodendron plantation in Alax desert based on the methods of field quadrat investigation from 2014 to 2017 and GIS.Results shows that:(1)the site quality of H.ammodendron plantation was ranking of semi-fixed dune>mobile dune>pebbly Gobi desert>rocky low mountain>soil low hill.(2)The survival rate and coverage of H.ammodendron plantation was different significantly,of which was higher in semi-fixed dune than in low hill and rocky low mountain,but not for preserving rate in the different site type,and the ranking was inconsistent with site quality,(3)Artificial planting of H.ammodendron increased the number of plant species in the herb layer of semi-fixed dunes and mobile dunes,but had no significant impact on the species diversity of other site types.Therefore,it is suggested better to select the semi-fixed dune and mobile dune to plant H.ammodendron,and consider the combining of artificial sand-fixation measures and H.ammodendron plantation the mobile dune is needed.