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通过比较我国亚热带地区19年生阔叶人工林和杉木人工林土壤碳氮储量,探讨树种对土壤碳氮库的影响.结果表明:阔叶人工林0～40cm土层碳储量平均为99.41Mg·hm-2,比杉木人工林增加33.1%;土壤氮储量为6.18Mg·hm-2,比杉木人工林增加22.6%.阔叶人工林林地枯枝落叶层现存量、碳和氮储量分别是杉木人工林的1.60、1.49和1.52倍,两个树种的枯落叶生物量、碳和氮储量均有显著差异.枯枝落叶层碳氮比值与土壤碳、氮储量之间呈显著负相关.阔叶人工林细根生物量(0～80cm)是杉木林的1.28倍,其中0～10cm土壤层细根生物量占48.2%;阔叶人工林细根碳、氮储量均高于杉木人工林.在0～10cm土层,细根碳储量与土壤碳储量具有显著正相关关系.阔叶树种比杉木的土壤有机碳储存能力更大.
The carbon and nitrogen contents in 19-year-old broadleaved and Chinese fir plantations in subtropical regions of China were compared to study the effects of species on soil carbon and nitrogen pools. The results showed that the average carbon storage in 0-40cm soil layers of broad-leaved plantations was 99.41Mg · hm -2, 33.1% higher than that of Chinese fir plantation, 6.18Mg · hm-2 of soil nitrogen, 22.6% higher than that of Chinese fir plantation. The existing amount of litter layer, carbon and nitrogen reserves of broad-leaved plantation forest were respectively Cunninghamia lanceolata 1.60, 1.49 and 1.52 times of litter, litter biomass, carbon and nitrogen reserves of the two species were significantly different.The litter carbon and nitrogen ratio and soil carbon and nitrogen reserves was significantly negative correlation between broadleaf artificial The fine root biomass (0 ~ 80cm) of forest was 1.28 times higher than that of Chinese fir plantation, in which the fine root biomass of 0-10cm soil layer accounted for 48.2%. The fine root and carbon storage of broadleaved plantation were higher than that of Chinese fir plantation. , While there was a significant positive correlation between fine-root carbon storage and soil carbon storage.The broad-leaved tree species had more soil organic carbon storage capacity than fir.