Examining Decomposition and Nitrogen Mineralization in Five Common Urban Habitat Types across Southern California to Inform Sustainable Landscaping
Examining Decomposition and Nitrogen Mineralization in Five Common Urban Habitat Types across Southern California to Inform Sustainable Landscaping
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DOI：
10.3390/urbansci6030061
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发表时间：
2022-09
期刊：
影响因子：
2
通讯作者：
G. Vourlitis;Emma Lousie van der Veen;Sebastian Cangahuala;Garrett J. Jaeger;C. Jensen;C. Fissore;Eric M. Wood;Joel K. Abraham;Kevin S. Whittemore;Elijah Slaven;Dustin R. VanOverbeke;J. Blauth;E. Braker;N. Karnovsky;W. M. Meyer
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作者：
G. Vourlitis;Emma Lousie van der Veen;Sebastian Cangahuala;Garrett J. Jaeger;C. Jensen;C. Fissore;Eric M. Wood;Joel K. Abraham;Kevin S. Whittemore;Elijah Slaven;Dustin R. VanOverbeke;J. Blauth;E. Braker;N. Karnovsky;W. M. Meyer
城市景观改造可以改变分解过程和土壤呼吸，使其难以预测区域二氧化碳排放量。在这里，我们探讨了初始质量损失率和净氮（N）矿化在自然和四个常见的城市土地覆盖（waterwise，waterwise与覆盖，灌木，草坪）从网站在南加州的七所大学。我们发现，分解和净氮矿化速率更快的高氮叶基质，自然栖息地表现出较慢的分解和矿化速率比管理的城市土地覆盖，特别是草坪和地区增加覆盖。这些结果在大学校园中是一致的，表明我们的研究结果是可靠的，可以预测整个南加州的分解率。虽然在凉爽潮湿的春天，很难确定栖息地之间的分解率差异的驱动机制，在城市栖息地的高分解强调，自然区域的城市景观的转换增加了温室气体排放。虽然被认为是可持续的，但增加覆盖物的地区分解率升高意味着，虽然这些转化可能会减少水的投入，但它们会增加土壤碳（C）通量。模仿自然景观，减少水和养分（覆盖物）的投入，种植耐旱的原生植被与柠檬枯落物可以减缓分解，减少区域碳排放。
Urban landscaping conversions can alter decomposition processes and soil respiration, making it difficult to forecast regional CO2 emissions. Here we explore rates of initial mass loss and net nitrogen (N) mineralization in natural and four common urban land covers (waterwise, waterwise with mulch, shrub, and lawn) from sites across seven colleges in southern California. We found that rates of decomposition and net N mineralization were faster for high-N leaf substrates, and natural habitats exhibited slower rates of decomposition and mineralization than managed urban landcovers, especially lawns and areas with added mulch. These results were consistent across college campuses, suggesting that our findings are robust and can predict decomposition rates across southern California. While mechanisms driving differences in decomposition rates among habitats in the cool-wet spring were difficult to identify, elevated decomposition in urban habitats highlights that conversion of natural areas to urban landscapes enhances greenhouse gas emissions. While perceived as sustainable, elevated decomposition rates in areas with added mulch mean that while these transformations may reduce water inputs, they increase soil carbon (C) flux. Mimicking natural landscapes by reducing water and nutrient (mulch) inputs and planting drought-tolerant native vegetation with recalcitrant litter can slow decomposition and reduce regional C emissions.