石生藻类,地衣,苔藓与碳酸盐岩持水性及生态意义

对藻类，地衣，芭藓生物财溶校样品及相应岩石样品进行了室内蒸发失水，主动吸水试验，结果表明：与无生物覆盖的岩石相比，有藻类生物覆盖的岩石表面失水量，吸水量分别提高１８．８，１．６倍，蒸发失水，主动吸水的时间分别延长４８％，５７％，持水量提高１６．６倍，有地衣生物覆盖的岩石表面失水量，吸水量分别提高２．９，１９．１倍，蒸发失水，主动吸水的时间分别延长３１％，１１９％，持水量提高２．９倍；有苔藓生物覆盖

Relationship between water holding of carbonate rock and saxicolous algae, lichen and moss and its ecological significance

Indoor experiments on water holding by evaporation and active water absorbing for algae, lichen and moss are carried out. The results indicate that the amount, on an average, of loss and absorption of water for algae, lichen and moss biokarst samples increases 18.8 and 1.6 times, 2.9 and 19.1 times and 81.2 and 8.1 times, respectively,compared with relative fresh rock samples. The continuous times of active water absorbing prolong 48%and 57%, 31%and 119%and 610%and 0%, respectively. The amount of water holding improves 16.6 times, 2.9 times and 57.2 times, respectively. On account of the colonization of organisms on rock surface, not only the property of water holding of rock is improved, but also the addition of biological cycle accelerated the carbon cycle on rock surface and the rates of carbonate rock corrosion underneath algae, lichen and moss are enlarged. Moreover, the nutrient elements are accumulated. All these provide the material basis for the development of seeds of high plant.