the moss coverage, algae coverage and biological crust coverage were more affected by litter and herbage coverage.
苔藓、藻类盖度及生物结皮盖度主要受枯落物、草本盖度等近地因子的影响。
therefore, in the initial stage of vegetation growth (low coverage), the biological crust should be strongly protected against disturbance;
由此可得出,当林草植被处于生长初期(即覆盖度较低)时,应大力保护生物结皮不受干扰;
biological crust improved nutrient and water condition of 0-5cm soil surface, thus there was positive effect.
促进作用主要是由于生物结皮的存在改善了土壤表层0-5cm的养分及水分状况;
in generally, the results showed that the effect of biological crust on both different vascular plants and different life history stages of one plant were variable in arid and semi-arid regions.
there is an abundant biological crust on the sand surface of the desert, which serves as one of the biological factors contributing to the sand fixation besides plants.