红壤丘陵区人工林恢复措施对土壤酶活性和微生物学性质的影响

我国红壤丘陵区水土流失较严重。本文研究人工林对土壤(0～20和20～40 cm)酶活性和微生物学性质的短期(13～14年)影响。土壤转化酶、脲酶、多酚氧化酶活性在次生天然林和湿地松樟树混交林中高于其他林分。次生天然林和湿地松樟树混交林土壤微生物生物量和土壤呼吸值较大、有机碳活性较强、土壤微生物基质利用效率较高。因此,短期影响下,湿地松樟树混交林较之针叶纯林和针叶混交林可改善土壤生化强度和微生物活性。

Effects of plantation restoration approaches on soil enzyme activities and microbial properties in hilly red soil region

Soil and water loss is serious in hilly red soil region in southern of China. Typical plantations were investigated and native soil samples (0-20 and 20-40 cm) were collected to study the effect of short-term (13-14 years) restoration plantations on soil enzyme activities and microbial properties. Soil invertase, urease and polyphenoloxidase activities were at higher levels in natural secondary forest (NF) and Pinus elliottii-Cinnamomum camphora plantation (PECC) than in other stands. At the same time, soil microbial biomass (carbon and nitrogen), basal respiration, ratio of soil microbial carbon to organic carbon and microbial efficiency exhibited higher in NF and PECC compared to others. Therefore, PECC can improve soil biochemical function and microbial properties compared to pure and mixed coniferous plantations.