中文摘要：

以川东紫色土丘陵区黄花生物埂护坡为研究对象,采用干筛法和湿筛法研究不同种植年限黄花对生物埂护坡土壤团聚体组成及稳定性影响。结果表明：种植黄花生物埂护坡风干团聚体和水稳性团聚体含量均高于对照组,且随着黄花种植年限的增加,含量呈增加趋势。风干团聚体平均质量直径（MWD）和几何平均直径（GMD）值均表现为三年生〉二年生〉四年生〉一年生〉对照组,水稳性团聚体MWD值表现为四年生〉二年生〉三年生〉一年生〉对照组,而GMD值为四年生〉三年生〉二年生〉一年生〉对照组。黄花生物埂护坡风干土壤团聚体和水稳性团聚体分形维数分别在1.957~2.385和2.502~2.800之间,分形维数均小于对照组,不同种植年限之间分形维数规律表现为一年生〉二年生〉三年生〉四年生,说明种植黄花改善生物埂护坡土壤团聚体结构,并且改善效果随着种植年限增加而增强。有机质、总氮、粘粒与团聚体粒径〉0.25mm含量、MWD、GMD、分形维数D均存在显著或极显著相关性,说明有机质、总氮、粘粒对土壤风干团聚体和水稳性团聚体含量及稳定性均有影响。

英文摘要：

Taking the different planting years of Hemerocallis citrinain terrace biological bank in purple soil area of eastern Sichuan as the subject,dry sieving and wet sieving was used,and studied the composition and stability of soil aggregates with different planting years of Hemerocallis citrina in terrace biological bank.The results showed that the contents of dry aggregates and waterstable aggregates of terrace biological banks which were planted Hemerocallis citrina were higher than those in the control group,and the content increased with planting years.The mean weight diameter（MWD）and geometric mean diameter（GMD）of dry aggregates all showed that：3-year〉2-year〉4-year〉1-year〉control group.The MWD of waterstable aggregates showed that：4-year〉2-year〉3-year〉1-year〉control group,but the GMD of waterstable aggregates showed that：4-year〉3-year〉2-year〉1-year〉control group.The fractal dimension of soil aggregates by dry sieving ranged within 1.957~2.385.By the wet sieving method,fractal dimension ranged within 2.502~2.800.They were all less than fractal dimension of the control group.Between the different planting years of Hemerocallis citrina,the fractal dimension showed that：1-year 〉2-year 〉3-year 〉4-year.It suggested that planting Hemerocallis citrina improved the structure of soil aggregates,and the effect enhanced with the increase of planting years.Soil organic matter,total N and clay was correlated with〉0.25 mm aggregates,WMD,GMD,fractal dimension D.It showed that soil organic matter,total N and clay had influence on aggregate structure and stability of dry aggregates and waterstable aggregates.