通过藓类结皮层的自然恢复和人工培养藓类植物促进结皮层形成试验，研究了腾格里沙漠固定沙丘生物结皮层形成过程中优势成分真藓 （Bryum argenteum） 的繁殖生物学特性，结果表明：藓类结皮层人工去除后在3～4年内70%的样方基本恢复，在此过程中真藓主要靠茎叶碎片传播和繁殖；通过分株法、撒茎叶法培养的真藓在1个月后长满整个样地, 主要通过如下方式繁殖——茎的碎片连续分枝可产生小植株，茎、叶均可产生原丝体，由原丝体发育产生小植株，小植株又可再生原丝体，如此反复产生新植物体，这一过程是野外人工促进生物结皮层形成过程中真藓主要的繁殖途径。与室内培养中真藓的繁殖特性相比较，野外培养的真藓在繁殖过程中产生的原丝体较粗壮，分枝多，但在两种条件下的繁殖特性相同，能够揭示该地区自然条件下藓类植物萌发和定居的繁殖机理。该研究为人工促进生物结皮层形成及治理受损结皮层提供了实验依据。
Soil microbiotic crusts cover extensive portions of the arid and semiarid regions of the world. Moss is one of the major components of the crusts. The reproduction and establishment of the mosses are crucial to the formation of moss crusts. Although many laboratory experiments have indicated that mosses can reproduce through spores, gemmae and fragmentation, the process of the dispersal and reproduction in natural conditions is not well understood in moss crusts. Bryum argenteum is the dominant species of moss crusts in the Shapotou region (37°27′ N, 104°57′ E) of the Tengger Desert. To examine characteristics of natural reproduction and establishment, 10 quadrats (10 cm×10 cm) were established on different positions of fixed dunes and the moss crust removed. These 10 quadrats were observed for three consecutive years and the species establishment and their coverage measured. In the third year, 2 quadrats (1 m×1 m) were established in a crust-absent area, and two different experiments were conducted, one on broadcast planting and the other on offshoots. The reproductive process was observed under the microscope, and the morphological indicators of new individuals measured. The results were compared with results from indoor experiments using the same methods. Our results showed that 70% of the quadrats (i.e., 7 of the 10 quadrats) recovered within 3-4 years. The quick recovery was most likely due to dispersal and reproduction of leaf and stem fragments of B. argenteum. Results from the artificial reproduction experiment showed that new plants occupied the uncovered space of the quadrats within one month. There were two main forms of reproduction: 1) stems continually branched and produced young plants; 2) young plants and the fragments of the stems and leaves repeatedly and extensively reproduced protonema which developed into a large number of new plants. The reproductive characteristics were identical between the two experiments although the protonema in the field was more robust and had more branches than the ones indoors. This research reveals the reproductive mechanism of the establishment of mosses in natural conditions in this region, and provides experimental evidence for the formation of moss crusts on fixed dunes.
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