关键词: 冻融循环, 植被混凝土, 主成分分析法, 基材

Abstract: Aiming at the fact that poor application effect of vegetation concrete in alpine region and lack of related research results, the freezing and thawing cycles tests for vegetation concrete substrate were carried out to analyze the response of three nutrient contents of vegetation concrete to freezing and thawing cycles. After freezing and thawing cycles，leaching test was conducted to explore the effect of freezing and thawing cycles on the nutrient retention capacity. The principal component analysis for the leaching rate was carried out by using Matlab, and the nutrient leaching of the substrate after freezing and thawing cycles was comprehensively evaluated. The results showed that the freezing and thawing cycles had obvious effect on the nutrient content and concrete substrate loss. With the increasing of freezing-thawing cycles, the total nitrogen content increased first and then decreased, the contents of ammonia nitrogen, available phosphorus and available potassium increased gradually, and the nitrate content decreased gradually. The freezing and thawing cycles enhanced the leaching rate of the three nutrient elements, as well as the nutrient leaching loss risk of vegetation concrete substrate, and it also reduced the nutrient conservation ability of the substrate, which was the same as the results of principal component analysis.

Key words: freezing and thawing cycles, vegetation concrete, principal component analysis, substrate