Thinning intensity but not replanting different species affects soil N2O and CH4 fluxes in Cunninghamia lanceolata plantation
Thinning intensity but not replanting different species affects soil N2O and CH4 fluxes in Cunninghamia lanceolata plantation
复制标题
间伐强度但不重新种植不同树种对杉木人工林土壤 N2O 和 CH4 通量的影响
DOI：
10.1016/j.scitotenv.2022.153458
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发表时间：
2022
影响因子：
9.8
通讯作者：
Yixiang Wang
中科院分区：
文献类型：
--
作者：
Yanjing Hu;Hui Zhang;Yang Lv;Binbin Ying;Yixiang Wang
间伐补植是改善人工林林分结构和树种组成的有效森林经营措施。然而，人工林中间伐和补植对土壤 N2O 和 CH4 通量的影响及其与土壤环境因素变化的关系知之甚少。通过为期36个月的田间试验，阐明间伐和补植不同树种对浅层杉木人工林土壤N2O和CH4通量及相关环境因子的影响。试验共设5个处理，分别为未剪对照（CK）、适度间伐+补种常绿苗（MTE）、中度间伐+补种落叶苗（MTD）、重度间伐+补种常绿苗（HTE）、重度间伐+补种落叶苗（HTD）。与对照相比，中度疏伐和重度疏伐N2O累计排放量分别增加12.4%和21.4%，CH4累计吸收量分别减少35.4%和38.8%。然而，对落叶或常绿幼苗补种的土壤N2O和CH4通量的影响并不显着。结果表明，由于土壤温度、不稳定碳和氮浓度的增加，间伐增加了 N2O 排放量并减少了 CH4 吸收。土壤温度是主导因素，矿物氮是影响N2O和CH4通量的影响因素。研究得出结论，间伐增加了全球变暖的可能性，其中 N2O 的贡献大于 CH4（113.5%：-13.5%）。我们的研究结果强调，随着强度的增加，间伐增加了 N2O 排放量，减少了 CH4 吸收，并且在间伐后的最初几年，落叶和常绿幼苗的重新种植对 N2O 和 CH4 通量没有不同的影响。
Thinning and replanting are effective forest management measures to improve the stand structure and species composition of artificial forests. However, the effects of thinning and replanting on soil N2O and CH4fluxes and their associations with changes in soil environment factors have been poorly understood in plantation forests. A 36-month field experiment was conducted to elucidate the effects of thinning and replanting different species on soil N2O and CH4fluxes and related environmental factors inCunninghamia lanceolataplantation on shallow soil. The experiment consisted of five treatments, uncut control (CK), moderate thinning + replanting evergreen seedlings (MTE), moderate thinning + replanting deciduous seedlings (MTD), heavy thinning + replanting evergreen seedlings (HTE), heavy thinning + replanting deciduous seedlings (HTD). Compared with the control, moderate and heavy thinning increased cumulative N2O emissions by 12.4% and 21.4%, respectively, and reduced CH4cumulative uptake by 35.4% and 38.8%, respectively. However, the effects on soil N2O and CH4fluxes replanting deciduous or evergreen seedlings were insignificant. The results showed that thinning increased N2O emissions and decreased CH4uptake due to the increased soil temperature, labile C and N concentrations. Soil temperature was the dominant factor, and mineral N was a contributing factor affecting N2O and CH4fluxes. The study concludes that thinning increased the global warming potential with N2O contributing more than CH4(113.5%: −13.5%). Our findings highlight that thinning increased N2O emissions and decreased CH4uptake with the increasing intensity and the replanting had no different effects between deciduous and evergreen seedlings on the fluxes of N2O and CH4during the early years following thinning.