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2004年在帽儿山森林生态站设置土壤置换试验,将0~30 cm农田土置换成邻近天然次生林淋溶层土(A处理)、淀积层土(B处理)和母质层土(风化砂,C处理),分别模拟森林皆伐次生演替、无种子库次生演替和原生演替,2014年研究温带落叶阔叶林不同演替类型在自然演替初期土壤碳、氮、磷计量特征的变化.结果表明:演替10年,A处理土壤碳、氮、磷含量无显著变化,B处理土壤碳和氮含量分别降低34.7%和38.6%,而C处理土壤碳和氮含量分别增加63.4%和198.4%.植被演替后,氮-碳异速生长关系斜率显著降低,磷-氮异速生长速率显著升高.10年演替后,仅C处理土壤C∶N减小44.5%,N∶P增加283.6%,其他处理变化不显著.土壤碳、氮、磷含量与活细根现存量、死细根现存量均存在显著相关关系,植被演替可能主要通过改变有机质输入驱动土壤碳、氮、磷含量及其计量关系.
Soil replacement tests were conducted at Maoershan Forest Ecological Station in 2004. The farmland soil from 0 to 30 cm was replaced by leached layer (A treatment), sedimentary layer (B treatment) and parent layer soil (weathered sand , C treatment), respectively, to simulate the succession of clear-cut secondary forest succession, without seed pool secondary succession and primary succession. In 2014, the different succession types of temperate deciduous broad-leaved forest were studied in the initial stage of natural succession. The results showed that there was no significant change in soil carbon, nitrogen and phosphorus content after A succession, soil carbon and nitrogen content decreased by 34.7% and 38.6%, respectively, while soil C and N content increased With the increase of 63.4% and 198.4% respectively.After the succession of vegetation succession, the slope of the allometric nitrogen-carbon allotment decreased significantly and the allo-growth rate of phosphorus-nitrogen increased significantly.After 10 years of succession, the soil C: N decreased only by 44.5 % And N: P increased by 283.6%, while the other treatments did not change significantly.The soil carbon, nitrogen and phosphorus contents were significantly correlated with the existing fine and fine root exudates, and the vegetation succession might be mainly driven by the change of organic matter input Soil carbon, nitrogen and phosphorus contents and their relationships.