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2013年8月,在腾格里沙漠东南缘1990年建立的人工固沙植被区,分别对油蒿(Artemisia ordosica)生殖株、半死株和死株3个退化阶段植株西北、西南、东北和东南4个方向生物土壤结皮(BSCs)类型、盖度和厚度进行了调查。结果表明:油蒿灌丛周围共出现了3类BSCs,分别为藻类结皮、地衣结皮和藓类结皮,藻类结皮分布范围最广。油蒿生殖株、半死株、死株灌丛均表现出西北方向BSCs盖度最大分别为89.75%、98.55%、80.40%;东南方向的盖度最小分别为23.10%、35.40%、25.44%;BSCs的厚度同样表现为西北方向最大分别为4.48、6.86、5.14mm,东南方向最小分别为2.14、3.26、2.80mm。油蒿生殖株、半死株和死株3个退化阶段BSCs总盖度表现为半死株>生殖株>死株,厚度表现为半死株>死株>生殖株。不同退化阶段的油蒿显著影响BSCs的拓殖和发育,尤其是处于BSCs演替后期的地衣结皮和藓类结皮;油蒿植株的生长过程的也是干旱、半干旱区地表微地貌逐渐变化的过程。
In August 2013, artificially sand-fixing vegetation zones were established in the southeast margin of the Tengger Desert in 1990. Three degraded plants, Artemisia ordosica, semi-dead and dead, were planted in northwest, southwest, northeast and southeast 4 The direction of biological soil crusts (BSCs) type, coverage and thickness were investigated. The results showed that there were three types of BSCs around the Artemisia ordosica shrubs, which were algal crusts, lichen crusts and moss crusts, respectively. The distribution of algal crusts was the most extensive. The maximum coverage of BSCs in northwestern China was 89.75%, 98.55% and 80.40%, respectively. The coverage in the southeast direction was 23.10%, 35.40% and 25.44% respectively. The BSCs The thickness of the same performance for the largest northwest were 4.48,6.86,5.14 mm, the minimum southeast were 2.14,3.26,2.80 mm. Artemisia ordosica reproductive strains, semi-dead and dead strains of three degradation stages of the total coverage of BSCs showed semi-dead> reproductive> dead, the thickness of the performance of semi-dead> dead> reproductive strains. Artemisia ordosica different stages of degradation significantly affect the colonization and development of BSCs, especially in the succession of BSCs succession of lichen crusts and moss crusts; Artemisia ordosica plant growth process is also arid, semi-arid area of the surface micro-landscape changes gradually process.