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通过采集半流动沙丘、5年、10年和22年生小叶锦鸡儿人工固沙植被的土壤样品,对各类型土壤的养分状况、微生物和主要土壤酶活性进行对比研究。土壤按5层取样:0～10,10～20,20～30,30～40,40～50cm。结果表明,采用植物固沙工程固定沙丘后,表层土壤(0～10cm)有机C和全N含量显著增加,同时土壤生物活性也大幅度提高,土壤微生物生物量C和N的含量以及土壤脲酶、蔗糖酶、磷酸单酯酶和多酚氧化酶活性均明显提高。这种改良效应随着年龄增长而逐渐增加。土壤微生物生物量C与土壤总有机C含量,微生物生物量N与土壤全N之间均存在着明显的正相关性。
Soil samples of artificial sand-fixing vegetation of Caragana microphylla at 5, 10 and 22 years old were collected to study the nutrient status, microorganism and major soil enzyme activities of different types of soils. Soil sampling by 5 layers: 0 ~ 10,10 ~ 20,20 ~ 30,30 ~ 40,40 ~ 50cm. The results showed that after fixing sand dune with sand fixation project, the content of organic C and total N in surface soil (0 ~ 10cm) increased significantly, while the soil bioactivity increased significantly. The contents of soil microbial biomass C and N as well as soil urease, sucrose Enzyme, phosphomonoesterase and polyphenol oxidase activities were significantly increased. This improvement effect increases with age. There was a significant positive correlation between soil microbial biomass C and soil total organic C, microbial biomass N and total N in soil.