论文部分内容阅读
以浙江省沿海基岩质海岸防护林的3种主要林分类型湿地松(Pinus elliottii)纯林、枫香(Liquidambar formosana)纯林、湿地松+枫香混交林作为研究对象,并选择无林地作对照,对其土壤有机碳矿化进行测定研究。结果表明:4种林分类型土壤有机碳矿化动态在整个培养过程,可分为快速下降期,缓慢下降期和相对稳定期3个阶段;对整个培养过程中不同林分类型土壤有机碳日均矿化量进行拟合,其变化趋势符合对数函数;对4种林分类型土壤有机碳矿化速率进行聚类分析得出,枫香+湿地松混交林0~20 cm土壤有机碳矿化速率最高,枫香纯林0~20 cm、湿地松纯林0~20 cm土壤有机碳矿化速率次之,枫香纯林20~40 cm、湿地松纯林20~40 cm、枫香+湿地松混交林20~40 cm土壤有机碳矿化速率一般,无林地0~20 cm和20~40 cm土壤有机碳矿化速率最低。说明土壤有机碳矿化速率随着土层的增加递减,表层土壤敏感性最强。
Three main forest types of Pinus elliottii pure forest, Liquidambar formosana pure forest and Slash pine + mixed forest of Liquidambar formosensis were selected as the research objects in the rocky coastal shelterbelts of Zhejiang Province, Control, the determination of soil organic carbon mineralization. The results showed that the dynamic changes of soil organic carbon mineralization in four forest types could be divided into three stages: rapid decline period, slow decline period and relatively stable period. During the whole cultivation process, According to the cluster analysis of soil organic carbon mineralization rate in four forest types, the soil organic carbon mineral in 0 ~ 20 cm soil layer of Liquidambar formosana + Pinus elliottii mixed forest The highest rate of soil organic matter was 0 ~ 20 cm for pure sweet maple and 0 ~ 20 cm for pure Pinus elliottii. Soil organic carbon mineralization rate was 20-40 cm for pure sweet gum and 20-40 cm for pure P. elliottii. + Pinus elliottii mixed forest at 20 ~ 40 cm soil organic carbon mineralization rate is generally the lowest in 0 ~ 20 cm and 20 ~ 40 cm soil organic carbon mineralization rate. Soil mineralization rate of soil organic carbon decreases with the increase of soil, surface soil strongest sensitivity.