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以贵州喀斯特石漠化山地退耕林地:刺槐(Robinia pseudoacacia)纯林(RP)、滇柏(Cupressus duclouxiana)纯林(CD)、刺槐滇柏混交林(RC)及未造林地(CK)为研究对象,采用图1方法进行取样,探讨了5种土壤酶活性(脲酶、蔗糖酶、多酚氧化酶、过氧化氢酶及总磷酸酶)和土壤养分之间的关系。结果表明,不同类型退耕林地的土壤养分之间存在显著差异,RP和RC土壤养分含量相对较高。土壤酶活性特征与土壤养分特征呈相似变化趋势。与CK相比,RC中5种土壤酶活性分别提高了52.1%、15.0%、30.9%、7.3%及27.9%。统计分析结果表明,土壤有机质和N是影响土壤酶活性的主要因子,K素可能是影响某些酶活性的限制因子。退耕还林措施明显改善了林地土壤质量,其中RP和RC的效果较好。
Taking the reclamation land of Robinia pseudoacacia pure forest (RP), Cupressus duclouxiana pure forest (CD), Robinia pseudoacacia mixed forest (RC) and non-silvicultural land (CK) as research object, The objects were sampled by the method of Fig. 1, and the relationships among soil enzyme activities (urease, invertase, polyphenol oxidase, catalase and total phosphatase) and soil nutrients were discussed. The results showed that there was a significant difference in soil nutrients among different types of forestland, and the contents of nutrients in RP and RC soil were relatively high. Soil enzyme activity characteristics and soil nutrient characteristics showed a similar trend. Compared with CK, the soil enzyme activities of five kinds of RC increased by 52.1%, 15.0%, 30.9%, 7.3% and 27.9%, respectively. Statistical analysis showed that soil organic matter and N were the main factors affecting soil enzyme activity. K could be a limiting factor affecting some enzyme activities. The measures of returning land for farming to forestry have obviously improved the soil quality of forest land, and the effect of RP and RC is better.