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首页> 外文期刊>Urban Forestry & Urban Greening >Soil respiration and its responses to biotic and abiotic factors in patchy remnant forests and urban green landscapes of Tianjin, China
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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

机译：土壤呼吸及其对天津市天津市绿色森林和城市绿色景观生物和非生物因子的反应

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摘要

Soil respiration (R-s) of forests plays an important role in the global carbon cycle. However, patchy remnant forests and their R-s characteristics are rarely studied. In this study, the diurnal and seasonal dynamics of the R-s 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 R-s of the patchy remnant forests and urban green landscapes were evaluated. Results showed that the patchy remnant forests had higher R-s than the urban green landscapes throughout the year. However, the R-s 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 R-s-ST, fit lines of R-s and soil water content (SWC) showed an opposite trend in the growing and dormant periods. In the growing season, the slopes of R-s-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 R-s-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 R-s and fine root biomass (FRB) were lower in the patchy remnant forests than in the urban green landscapes, which demonstrated that the R-s of the patchy remnant forests increased gently with increasing FRB. In addition, R-s 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 R-s of the patchy remnant forests were ST and FRB.
机译：森林的土壤呼吸（R-S）在全球碳循环中起着重要作用。然而，很少研究斑驳的残余森林及其R-S特征。在这项研究中，使用了中国天津市城市边缘的便携式土壤碳通量自动分析仪确定了三种拼合森林的R-S的昼夜和季节动态和两种城市绿色景观。然后，评估了非生物分析和生物因素对斑态残留林和城市绿色景观的R-S的影响。结果表明，全年的城市绿色景观，斑驳的残余森林具有更高的R-S。然而，斑块残余林对土壤温度（ST）的R-S反应比城市绿色景观更为温和，这表明了前者的全球变暖能力越高。与R-S-ST的对特征相反，R-S和土壤水含量（SWC）的配合线表现出生长和休眠期的相反趋势。在不断增长的季节中，R-S-SWC的斜率在斑驳的残余林和城市绿色景观之间相似。斑驳的剩余林的较高y-enterceps表明他们的使用效率较大，而不是城市绿色景观。在休眠期间，R-S-SWC的较高坡度为斑块残余森林建议它们对SWC的变化比城市绿色景观更敏感。同时，R-S和细根生物量（FRB）的线性斜率在斑块残余林中较低，而不是城市绿色景观，这表明斑块残余林的R-S随着越来越多的FRB而轻微增加。此外，R-S与细菌和放线菌的量呈正相关，但与真菌呈负相关。规范相关分析结果表明，斑块残余林R-S上的前两个驱动因子是ST和FRB。

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