缓冲带植被模式对河岸土壤稳定性的影响

Effects of Buffer Zone Vegetation Patterns on Riparian Soil Stability

通过10年辽河保护区河岸植被缓冲带工程实施,研究了河岸带不同植被模式对于河岸土壤团聚体组成、结构、土壤稳定性、抗蚀性的影响。结果表明,河岸土壤粒径组成为砂粒质量分数为58%~68%,粉粒质量分数为30%~40%。土壤有机质质量分数为12.0~28.1 g·kg^(-1),与植被种植前相比,灌草、乔草缓冲带河岸土壤有机质含量明显增加。相比于干筛法,湿筛后水稳性团聚体的主要粒径组成为0.25~0.50 mm,占比14%~25%,粒级直径>0.5 mm土壤水稳性团聚体占比明显下降,而粒级直径为0.25~0.50 mm的土壤水稳性团聚体占比明显增加。杞柳缓冲带和水蜡缓冲带土壤结构、团聚体稳定性和抗蚀性高于其他植被带。

Through the implementation of the riparian vegetation buffer zone project in the Liaohe River Reserve for 10 years,the effects of different vegetation patterns in the riparian zone on the composition,structure,soil stability and erosion resistance of riparian soil aggregates were studied.The results showed that the particle size composition of riparian soil was 58%~68%and 30%~40%;the soil organic matter content was 12.0~28.1 g·kg^(-1),and compared with the vegetation before planting,the content of soil organic matter in the riparian soil of shrubs and grasses and arbors and grasses increased significantly;compared with the dry sieve method,the main particle size composition of the water-stable aggregates after wet sieving was 0.25~0.50 mm,accounting for 14%~25%,and the proportion of soil water-stable aggregates with a particle size diameter greater than 0.5 mm decreased significantly,while the proportion of soil water-stable aggregates with a particle size diameter of 0.25~0.50 mm increased significantly.The soil structure,aggregate stability and erosion resistance of the willow shrub and wax shrub belt were higher than those of other vegetation belts.