Soil greenhouse gas fluxes following conventional selective and reduced-impact logging in a Congo Basin rainforest
Soil greenhouse gas fluxes following conventional selective and reduced-impact logging in a Congo Basin rainforest
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DOI：
10.1007/s10533-020-00718-y
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发表时间：
2020-11
期刊：
影响因子：
4
通讯作者：
Rodine Tchiofo Lontsi;M. Corre;N. A. Iddris;E. Veldkamp
中科院分区：
文献类型：
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作者：
Rodine Tchiofo Lontsi;M. Corre;N. A. Iddris;E. Veldkamp
选择性采伐是热带森林退化的主要原因之一，但人们对它对非洲高度风化的铁红壤中温室气体（GHG）通量的影响知之甚少。我们测量了土壤CO2，N2 O和CH 4通量，和他们的土壤控制因素在两个森林，经历了传统的选择性采伐和减少影响采伐在喀麦隆。每个测井系统有四个重复的地块，每个都包括扰动地层（道路，测井甲板，集材小道，砍伐间隙）和一个未受干扰的参考区域。从2016年9月至2017年10月每月进行测量。年温室气体通量范围为4.9至18.6 Mg CO2-C、1.5至79 kg N2 O-N和− 4.3至71.1 kg CH 4-C ha− 1 year −1。与未扰动区相比，集材道、集材平台和道路的土壤CO2排放量减少，CH 4排放量增加（P< 0.01），而集材道的土壤N2 O排放量增加（P= 0.03-0.05）。与未扰动区相比，复合扰动区土壤CO2排放量减少了28%，N2 O排放量增加了83%，CH 4排放量增加了7倍（P≤ 0. 01）。然而，受干扰的地层仅占两种采伐系统影响面积的4-5%，这大大降低了景观水平上土壤温室气体通量的变化。在所有层中，土壤温室气体通量的调节土壤容重和充满水的孔隙空间，表明土壤通气和气体扩散的影响，并通过土壤有机碳和氮，这表明控制这些温室气体的微生物过程的基板可用性。
Selective logging is among the main causes of tropical forest degradation, but little is known about its effects on greenhouse gas (GHG) fluxes from highly weathered Ferralsol soils in Africa. We measured soil CO2, N2O, and CH4fluxes, and their soil controlling factors at two forests that had undergone conventional selective logging and reduced-impact logging in Cameroon. Each logging system had four replicate plots, each included the disturbed strata (road, logging deck, skidding trail, and felling gap) and an undisturbed reference area. Measurements were conducted monthly from September 2016 to October 2017. Annual GHG fluxes ranged from 4.9 to 18.6 Mg CO2–C, from 1.5 to 79 kg N2O–N, and from − 4.3 to 71.1 kg CH4–C ha−1year−1. Compared to undisturbed areas, soil CO2emissions were reduced and soil CH4emissions increased in skidding trails, logging decks and roads (P< 0.01) whereas soil N2O emissions increased in skidding trails (P= 0.03–0.05). The combined disturbed strata had 28% decrease in soil CO2emissions, 83% increase in soil N2O emissions, and seven times higher soil CH4emissions compared to undisturbed area (P≤ 0.01). However, the disturbed strata represented only 4–5% of the area impacted in both logging systems, which reduced considerably the changes in soil GHG fluxes at the landscape level. Across all strata, soil GHG fluxes were regulated by soil bulk density and water-filled pore space, indicating the influence of soil aeration and gas diffusion, and by soil organic carbon and nitrogen, suggesting the control of substrate availability on microbial processes of these GHG.