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中文摘要：
以桂林毛村岩溶生态试验场为研究区域，通过对该地区岩溶区和碎屑岩区不同土地利用方式的土壤进行采样和分析，系统研究和比较了旱地、水田、林地和灌丛四种不同土地利用方式下土壤水稳性团聚体分布特征。结果表明：无论是岩溶区石灰土还是碎屑岩区红壤，土地利用方式对土壤水稳性团聚体分布和组成有着显著的影响（p〈0．05）。与旱地和水田等传统农田相比，灌丛和林地这两种自然土壤明显提高了〉5mm和〉0．25mm团聚体的比例，并且团聚体稳定性增加。岩溶区灌丛的平均重量直径（MWD）和几何平均直径（GMD）较旱地分别提高了185％和179％，较水田提高了361％和481％，林地的MWD和GMD分别较旱地提高了65％和43％，较水田提高了167％和198％；而碎屑岩区灌丛的MWD和GMD分别较其旱地和水田提高了103％和134％、15％和32％，林地的MWD和GMD分别较其旱地和水田提高了117％和152％、23％和43％。这说明相比碎屑岩区红壤，岩溶区石灰土受到人类活动的频繁干扰之后退化更快，土壤团聚体稳定性下降更多，这也说明了岩溶区土壤环境的脆弱性。
英文摘要：
In order to make a systematic study on the effects of different types of land-use on the distribution characteristics of soil water-stable aggregates （WSA）, soil samples are collected from dry land, paddy field, forest land and shrub land in karst and clasolite areas in Maocun, Guilin, a typical karst area in Southwest China. The results show that land-use has a significant impact on the distribution and the composition of WSA （p~0.05） in soils in both karst area and clasolite area. Comparing to traditional farmland, the propor- tions of WSA （that〉5mm and 0.25mm） in natural forest and shrub soils are significantly increased. Moreo- ver, the stability of the WSA is also increased. This shows that aggregate stability in less disturbed land-use is higher than that in more disturbed land-use by human. Mean weight diameter （MWD） and Geometric mean diameter （GMD） in shrub land in karst area are increased by 185 % and 179 % respectively comparing with that in dry land, while 361% and 481 % respectively comparing with that in paddy field. The MWD and GMD in forest land are increased by 65 % and 43 % comparing with that in dry land, while 167 % and 198 % comparing with the paddy field. The increasing range of MWD and GMD in shrub land in clasolite area, comparing with that in dry land and paddy field, are 103 % and 134 %, 15 % and 32 % respectively. The MWD and GMD in forest land, comparing with that in dry land and paddy field, are increased by 117 % and 152 %, 23 % and 43 %. The results also show that after having been greatly affected by human activities, the quality of rendzina soil in karst area degrades faster than that of red soil in clasolite area and the WSA stability decreases steeply, all of which indicate that the soil environment in karst area is vulnerable.
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