[Effects of moss crust on soil seed bank at southeast edge of Tengger Desert].
An investigation was made on the soil seed bank at southeast edge of Tengger Desert with moss crust under natural and artificial vegetations. The results showed that the density of soil seed bank increased with the development of moss crust, which was 3.4 times higher under natural vegetation than under 24 years old artificial vegetation. In the seed bank, a total of 12 species belonging to 6 families were identified, among which, annuals occupied more than 70%. No perennial seeds were found under artificial vegetation, but under natural vegetation, 20% of the seeds were of perennials. As for semi-shrub seeds, they occupied 20% and 10% under artificial and natural, vegetation, respectively. Under artificial vegetation, the species richness index of soil seed bank was relatively lower, being about a half of that under natural vegetation. The species diversity index of the seed bank had a slight decrease with the development of moss crust under artificial vegetation, but increased to the maximum (0. 693) under natural vegetation. The species similarity index was 1 among the seed banks under artificial vegetations, and 0.4 between those under artificial and natural vegetation. The development of moss crust increased the roughness of surface soil and improved soil environment significantly, which could have positive effects on seed entrapment and plant establishment.
Su
Yan-gui
YG
Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental & Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China. guiruian@163.com
Li
Xin-Rong
XR
Jia
Rong-Liang
RL
Pan
Yan-Xie
YX
D019068:Bryopsida / Q000378:metabolism*; D002681:China; D003247:Conservation of Natural Resources; D003889:Desert Climate; D017753:Ecosystem; D006109:Poaceae / Q000254:growth & development* / Q000502:physiology; D012639:Seeds / Q000254:growth & development* / Q000502:physiology; D012987:Soil / Q000032:analysis*; D014197:Trees / Q000254:growth & development* / Q000502:physiology
D012987:Soil