中文摘要：

以贵州普定喀斯特石漠化区域石生银叶真藓（Bryum argenteum Hedw.）、扭口藓（Barbula unguicu-lata Hedw.）、穗枝赤齿藓（Erythrodontium julaceum（Schwaegr．）Par。）、美灰藓（Eurohy pnum leptothollum（C．Muell．）Ando．）、东亚砂藓（Racomitrium japonicum Dozy et Molk．）和雪茶（地衣）（Thamnolia vermicu-laria（Ach.）Asa-hina）为对象，研究了这些石生植物和其基质土壤碳酸酐酶（CA）的活性，可为石生植物的生物岩溶作用机理和石漠化生态环境的治理提供一定的参考。结果表明，6种植物CA的活性存在一定的差异，以美灰藓的CA活性272.99U·g-1（FW）最高，东亚砂藓的CA活性33．45U·g-1（FW）最低；银叶真藓基部土壤CA活性最高，为101．81 U·g-1（干土），美灰藓CA活性15．95U·g-1（干土）最低。CA活性与土壤全磷、全钾、石砾含量和土壤含水量之间呈极显著的相关性。

英文摘要：

The samples of six moss plants include B. argenteum, B. unguiculata, E. julaceum, E. leptothol- lure, R japonicum and T vermicularia were collected from the karst rock desertification area in Puding of Guizhou, as the objects of this study. The carbonic anhydrase （CA） activity of the epilithic plants and the matrix of soil was studied, from which the analyses of bio-karst mechanism and governance of ecological en- vironments in karst rocky desertification areas can be performed. The results show that there are some differ- ences in carbonic anhydrase activity of six epilithic plants. The E. leptothollum is highest, reaching 272.99 U · g-1 （FW）, while the minimum is 33.45 U · g 1 （FW） in R. japonicum. The B. argenteum base soil CA ac- tivity（101.81 U · g-1 （dry soil） is the highest. The E. leptothollum is 15.95 U · g 1 （dry soils） as the low- est. It could be concluded that CA activity has positive correlations with plant and soil carbonic anhydrase content of total phosphorus, kaliurn, gravel and soil moisture, respectively.