模拟西伯利亚红松种植对大兴安岭中北部森林地上生物量的长期影响

Simulating the long-term effects of planting Pinus sibirica on aboveground biomass of forests in the north-central Great Xing’an Mountains

西伯利亚红松是寒温带森林重要建群树种,其在大兴安岭引种种植将直接影响区域森林生态系统的结构和固碳功能。分析引种种植西伯利亚红松对大兴安岭森林地上生物量的长期影响,对厘清区域碳汇及碳中和有重要意义。本研究采用野外调查数据和森林景观模型相结合的方法,量化景观尺度西伯利亚红松不同种植强度对大兴安岭中北部森林及本地主要树种地上生物量动态影响。结果表明:引种种植西伯利亚红松对提高大兴安岭中北部林区森林地上生物量起积极作用,未来可在该区域大面积引种种植西伯利亚红松;不同种植强度预案下森林地上生物量变化趋势相似,均提高了森林地上生物量,其中低强度种植预案下森林地上生物量增幅最大,达8.66 Mg·hm^(-2);西伯利亚红松引种种植对本地主要树种的影响存在明显差异,兴安落叶松和云杉地上生物量升高0.19-8.88 Mg·hm^(-2),樟子松、山杨和白桦地上生物量降低0.42-12.86 Mg·hm^(-2)。

Pinus sibirica is an important cold-temperate tree species introduced and planted in the Great Xing'an Mountains,which directly affects forest ecosystem structure and carbon sequestration.Analyzing the long-term effects of planting P.sibirica on aboveground biomass of forests has significant implications for clarifying regional carbon sinks and carbon neutrality.We assessed the dynamic changes in aboveground biomass of various native tree species based on field survey data and forest landscape model.The introduction and planting of P.sibirica played a positive effect on the forest aboveground biomass at landscape scale.P.sibirica should thus be introduced and planted at a large scale in the future.The increasing rates of aboveground biomass under different planting intensity scenarios were basically similar,with a maximum of 8.66 Mg·hm^(-2)in low-intensity planting scenario.The change rates in aboveground biomass differed significantly among major native tree species.The aboveground biomass increased by 0.19-8.88 Mg·hm^(-2)for Larix gmelinii and Picea koraiensis,while decreased by 0.42-12.86 Mg·hm^(-2)for Pinus sylvestris var.mongolica,Populus davidiana,and Betula platyphylla.