坡地土壤酶流失规律初探

采用人工室内降雨方法就河北内邱县岗底坡地褐土酶活性流失规律进行了初步探讨。结果表明:流失泥沙中单位土体酶活性随坡度增大而减小,除脲酶外流失泥沙均高于土壤中酶活性,有明显富集,呈现出高肥力土壤高流失,低肥力土壤低流失的基本规律;土壤酶流失总量与坡度呈指数变化关系,符合MC=atb预测模型;流失四种酶(过氧化氢酶、脲酶、蔗糖酶、磷酸酶)之间呈显著正相关,水土流失引起酶总体的损失;土壤酶和养分流失之间呈现出一定的相关关系,土壤蔗糖酶和磷酸酶活性可作为土壤侵蚀度的分级指标。

Primary Research on Soil Enzymes Runoff Rules from Sloping Field

Based on the artificial rain method in the laboratory, this research was focused on enzyme runoff rules of cinnamon soil in downland and slope located in Qiu County, Hebei Province. The results indicated that, enzyme activity per soil unit in running sand is decreased with increasing of slope gradient. Enzyme activity in soil was higher than that in running sand except urea enzyme. And the enrichment is significant, which showed high runoff from high fertility soil and low runoff from low fertility soil. The relationship between total amount of soil enzyme runoff and slope gradient was exponential following this prediction model MC=atb. The enzyme losses were aroused by soil and water losses. And the relationships of four enzymes from runoff (Hydrogen peroxidase, urease, surase and phosphatase) were significantly positive correlation. Soil enzyme was definitely related to nutrition runoff. The activities of soil surase and phosphatase were probably used as classification index as soil erosion.