小兴安岭草本泥炭沼泽土壤有机碳、氮和磷分布特征
Distribution characteristics of organic carbon, nitrogen and phosphorus in the soils of herbaceous peat swamps in the Xiaoxing’an mountains
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摘要:
对小兴安岭草本泥炭沼泽湿地土壤有机碳、氮和磷含量分布特征进行研究。结果表明：漂筏苔草湿地土壤有机碳含量最高，有机碳平均含量为438.40 g/kg，平均碳密度为88.99 kg/m3，碳储量为35.40 kt/km2，且10~20 cm碳含量高于其他土层。修氏苔草湿地土壤有机碳含量随土层加深而逐渐减少，平均碳含量为98.74 g/kg，碳密度为56.27 kg/m3，碳储量为20.03 kt/km2。2类湿地土壤全氮、水解氮和速效磷垂直变化均表现为随土层加深而逐渐减少，漂筏苔草湿地土壤全氮、水解氮、全磷和速效磷含量均高于修氏苔草湿地，分别是修氏苔草湿地的271%、548%、132%和216%。漂筏苔草湿地40 cm土层氮、磷储量分别是修氏苔草湿地的4.40和1.33倍。土壤有机碳与全氮、水解氮、全磷和速效磷呈极显著正相关（P0.01），土壤有机碳、氮、磷均与土壤密度呈极显著负相关（P0.01）。
Abstract:The distribution characteristics of organic carbon, nitrogen and phosphorus in soils were analyzed in two herbaceous peat swamps in the Xiaoxing’an mountains. The results show that the content of organic carbon in the Carex pseudocuraica wetland was higher than that in the C. schmidtii wetland. Carbon storage, average carbon content and carbon density of the C. pseudocuraica wetland were 35.40×103 t per km2, 438.40 g per kg and 88.99 kg per m3, respectively, while those of the C. schmidtii wetland were 20.03×103 t per km2, 98.74 g per kg and 56.27 kg per m3. In the C. pseudocuraica wetland, the content of organic carbon was higher in the 10--20 cm soil layer, while in the C. schmidtii wetland, organic carbon content gradually decreased with increasing soil depth. The vertical changes of total nitrogen, hydrolyzable nitrogen and available phosphorus in both types of wetland showed a tendency to decrease with increasing soil depth. The contents of total nitrogen, hydrolyzable nitrogen, total and available phosphorus in the C. pseudocuraica wetland were higher than those in the C. schmidtii wetland by 271%, 548%, 32% and 216%, respectively. The storages of nitrogen and phosphorus in the 0--40 cm soil layer of the C. pseudocuraica wetland were 4.40 and 1.33 times larger than those in the C. schmidtii wetland. Carbon content in the soil was significantly and positively correlated (P0.01) with total nitrogen, hydrolyzable nitrogen, total phosphorus and available phosphorus, while the contents of organic carbon, nitrogen and phosphorus were significantly but negatively correlated (P0.01) with soil bulk density.
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