喀斯特石漠化地区苔藓植物生长状况及其保土保水作用

Soil and Water Conservation Effects of Nine Bryophyte Biological Crusts in Karst Rocky Desertification Area

为了揭示苔藓植物结皮的生态功能及在石漠化治理中的运用前景,通过野外实地调查,对喀斯特石漠区域生物结皮层9种藓类植物的生物量和保土量测定。结果表明,在喀斯特石漠化地区,对于同种苔藓结皮,生物量和保土量之间是一个正相关的关系,即随着苔藓结皮生物量的增加,其保土量明显增加;但在不同苔藓植物之间,这两者不存在明显的相关性。生物量最大的是狭网真藓4508 kg·hm^(-2),保土量最大的是狭网真藓9819.0 kg·hm^(-2)。9种苔藓植物的饱和吸水率在319.92%~686.71%之间,最高的是钝叶匍灯藓686.71%,最低的是细枝羽藓,也达到319.92%。初步看来,狭网真藓具有最高的生物量和饱和吸水量。喀斯特石漠化地区苔藓生物结皮生物量与吸水量关系成正相关。

In order to reveal the ecological function of bryophyte crust and its application prospect in the control of rocky desertification,the biomass and soil retention of nine mosses in the biological crust of karst stone desert region were measured through field investigation.The results showed that there was a positive correlation between biomass and soil retention of the same species of bryophyte crust in karst rocky desertification area,that was,with the increase of bryophyte crust biomass,the soil retention increased significantly.However,there was no significant correlation between the biomass and Soil conservation quantity.The highest biomass was Bryum anagustirete Kindb 4508 kg·hm^(-2),and the highest soil retention was Bryum anagustirete Kindb 9819.0 kg·hm^(-2).The water conservation data of the nine bryophytes ranged from 319.92%to 686.71%.The highest and lowest mosses were Plagiomnium rostratum T.Kop,and Thuidium delicatulum(Hedw.)Mitt.Studies had shown that Bryum anagustirete Kindb has the highest biomass and saturated water absorption.There was a positive correlation between bryophyte and water absorption in karst rocky desertification area.