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Soil respiration and its responses to biotic and abiotic factors in patchy remnant forests and urban green landscapes of Tianjin, China
Urban Forestry & Urban Greening ( IF 6.4 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.ufug.2020.126743 Zhang Chengfang , Li Desheng , Wei Jiayu , Zhao Longfei , Liu Fude
Urban Forestry & Urban Greening ( IF 6.4 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.ufug.2020.126743 Zhang Chengfang , Li Desheng , Wei Jiayu , Zhao Longfei , Liu Fude
Abstract Soil respiration (Rs) of forests plays an important role in the global carbon cycle. However, patchy remnant forests and their Rs characteristics are rarely studied. In this study, the diurnal and seasonal dynamics of the Rs of three patchy remnant forests and two urban green landscapes were determined using a portable soil carbon flux automatic analyzer in the urban fringe of Tianjin, China. Then, the effects of abiotic and biotic factors on the Rs of the patchy remnant forests and urban green landscapes were evaluated. Results showed that the patchy remnant forests had higher Rs than the urban green landscapes throughout the year. However, the Rs responses of the patchy remnant forests to soil temperature (ST) were more modest than those of the urban green landscapes, which indicated the higher resistant capacity to global warming of the former than the latter. In contrast to the pair traits of Rs-ST, fit lines of Rs and soil water content (SWC) showed an opposite trend in the growing and dormant periods. In the growing season, the slopes of Rs-SWC were similar between the patchy remnant forests and the urban green landscapes. The higher y-intercept of the patchy remnant forests indicated their larger water use efficiency than the urban green landscapes. In the dormant period, the higher slope of Rs-SWC for the patchy remnant forests suggested they were more sensitive to changes in SWC than the urban green landscapes. Meanwhile, the linear slopes of Rs and fine root biomass (FRB) were lower in the patchy remnant forests than in the urban green landscapes, which demonstrated that the Rs of the patchy remnant forests increased gently with increasing FRB. In addition, Rs was positively correlated with the amounts of bacteria and actinomycetes but negatively correlated with fungi. Results of canonical correlation analysis showed that the first two driving factors on the Rs of the patchy remnant forests were ST and FRB.
更新日期：2020-08-01
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