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采用野外凋落物网袋分解法,在华北落叶松(Larixprincipis-rupprechtii)人工林中研究胡枝子(Lespedeza bicolor)叶凋落物的混入能否促进华北落叶松叶凋落物的分解。本试验设置了4种不同质量混合比例的叶凋落物处理:即纯华北落叶松,华北落叶松和胡枝子(3:1),华北落叶松和胡枝子(1:1),华北落叶松和胡枝子(1:3)。结果表明:(1)胡枝子叶凋落物能加快华北落叶松叶凋落物的分解,随着分解期的延长以及胡枝子叶凋落物比例的增加,促进作用越来越明显。(2)随分解期的延长,叶凋落物中的N、P呈上升趋势,而K、C呈下降趋势,混合叶凋落物中的N、P、K、C含量均高于纯华北落叶松,养分含量随着胡枝子比例的增加而增加。(3)随着胡枝子叶凋落物比例的增大,土壤中的碱解N、速效P、速效K、有机质和p H值含量均呈现上升趋势。
The field litter bag decomposition method was used to study whether the mixed litter of Lespedeza bicolor leaf litter could promote the litter decomposition of Larix principis-rupprechtii. In this experiment, four kinds of foliar litter with different mass mixing ratios were set up: pure Larix principis-rupprechtii, Larix principis-rupprechtii and Lespedeza bicolor (3: 1), Larix principis-rupprechtii and Lespedeza viride (1: 1) Lespedeza (1: 3). The results showed that: (1) Litter leaf litter could accelerate the decomposition of litter in Larix principis-rupprechtii leaves. With the prolongation of decomposition and the increase of Lobe leaf litter proportion, the promotion effect was more and more obvious. (2) With the extension of decomposition period, N and P in leaf litter increased, but K and C decreased. N, P, K and C contents in mixed leaf litter were higher than that in pure Larch , Nutrient content increased with the increase of Lespedeza proportion. (3) With the increase of the proportion of Lespedeza Lobe leaves litter, the contents of alkaline N, available P, available K, organic matter and p H in soil increased.