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采用负压法对福建省三明市亚热带常绿阔叶林中米槠次生林(BF)、米槠人促更新林(RF)、米槠人工林(CP)0~15、15~30、30~60 cm土层土壤溶液可溶性有机质(DOM)的浓度及光谱学特征进行研究.结果表明:土壤溶液可溶性有机碳(DOC)浓度整体趋势为RF>CP>BF,而可溶性有机氮(DON)则为米槠人工林最高;且DOC和DON在表层(0~15 cm)土壤浓度皆显著高于底层(30~60 cm).芳香化指数大小为RF>CP>BF,且整体为表层较高.米槠人工林表层土壤以荧光强度高的短波峰(320 nm)为特征峰,表明其易分解物质含量高,腐殖化程度较低;而米槠人促更新林表层土壤则以宽平的中长波峰(380 nm)为特征峰,说明其腐殖化程度较高,有助于土壤肥力的储存.此外,30~60 cm深层DOM特性几乎不受森林更新方式的影响.
The negative pressure was applied to analyze the secondary forest (BF), the rejuvenating forest (RF), the crabgrass plantation (CP) in the subtropical evergreen broad-leaved forest in Sanming City of Fujian Province from 0 to 15, 15 to 30 and 30 to 60 cm The results showed that the overall trend of dissolved organic carbon (DOC) in soil solution was RF> CP> BF, while that of soluble organic nitrogen (DON) The highest in plantation, and the concentrations of DOC and DON in the surface layer (0-15 cm) were significantly higher than those in the bottom layer (30-60 cm). The aromatization index was RF> CP> BF and the overall surface area was higher. The surface soil of plantations with the peak of high fluorescence intensity (320 nm) as the characteristic peak, indicating that its high content of decomposable substances, humification of a lower degree; The peak (380 nm) is the characteristic peak, indicating that the soil humification degree is high, which is helpful for the storage of soil fertility.In addition, the deep DOM characteristics at 30 ~ 60 cm are hardly influenced by the forest regeneration method.