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采用凋落物分解袋野外埋置法,对平朔露天煤矿复垦区刺槐油松混交林凋落物分解过程及其养分动态进行了分析。结果表明,凋落叶年分解速率表现为刺槐(51.27%)>混合(39.48%)>油松(29.05%);由Olson模型拟合的年分解系数表现为刺槐(0.71)>混合(0.46)>油松(0.33);分解50%和95%所需时间均表现为油松>混合>刺槐;各类型凋落叶分解95%所需时间约为分解50%所需时间的4倍;在1 a的分解过程中,各类型凋落叶的C,K均表现为直接释放模式,刺槐的N和P表现为富集模式,油松的N和P表现为淋溶—富集—释放模式,混合叶的N表现为富集模式,P表现为淋溶—富集模式。刺槐和油松凋落叶的混合分解较油松凋落叶单独分解表现出明显的促进作用。
The litter decomposition process and nutrient dynamics of the Chinese pine mixed forest in the reclamation area of Pingshuo coal mine were analyzed by field litter bagging method. The results showed that the annual decomposition rate of litter was Robinia pseudoacacia (51.27%)> mixed (39.48%)> Pinus tabulaeformis (29.05%). The annual decomposition coefficients fitted by Olson model were Robinia pseudoacacia (0.71)> mixed Pinus tabulaeformis> Pinus tabulaeformis> Pinus tabulaeformis> Pinus tabulaeformis> Pinus tabulaeformis> Pinus tabulaeformis> Pinus tabulaeformis> Pinus tabulaeformis> Pinus tabulaeformis. The decomposition time of 50% In the process of decomposition, the C and K of litter showed the direct release mode, the N and P of Robinia pseudoacacia showed enrichment mode, the N and P of Pinus tabulaeformis showed leaching-enrichment-release mode, N is enriched and P is leached - enriched. The mixed decomposition of Robinia pseudoacacia and Pinus tabulaeformis leaves showed obvious promotion effect compared with the single decomposition of Pinus tabulaeformis leaves.