Soil Carbon and Carbon/Nitrogen Ratio Change under Tree Canopy, Tall Grass, and Turf Grass Areas of Urban Green Space.
Soil Carbon and Carbon/Nitrogen Ratio Change under Tree Canopy, Tall Grass, and Turf Grass Areas of Urban Green Space.
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DOI：
10.2134/jeq2015.03.0121
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发表时间：
2016
影响因子：
2.4
通讯作者：
S. Livesley;Alessandro Ossola;C. Threlfall;A. Hahs;Nicholas S. G. Williams
中科院分区：
文献类型：
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作者：
S. Livesley;Alessandro Ossola;C. Threlfall;A. Hahs;Nicholas S. G. Williams
城市绿地中的土壤是重要的碳 (C) 储存库，但碳氮 (C/N) 比较高的城市土壤也可以缓冲化肥使用或大气沉降造成的氮富营养化。植被管理实践对城市绿地土壤碳循环和碳氮比的影响在很大程度上尚不清楚。 2013 年，我们在 13 个高尔夫球场 (= 13) 中建立的四个随机样地位置 (= 4)，从树冠、高草和矮草坪区域 (= 3) 收集了重复 (= 3) 土壤样本。在每个采样点，土壤被分为 0 至 0.1 米、0.1 至 0.2 米和 0.2 至 0.3 米深度（总计 = 1404）。线性混合模型研究了土壤特性、植被属性和绿地年龄之间的关系。树冠土壤的压实度（1.07 g cm）低于草地区域（1.32 g cm）。同样，树冠土壤的平均 C/N 比为 17.2，而草地地区的平均 C/N 比为 14.2 至 15.3。树冠区域的土壤特性最好用树木断面积和林下植被体积来解释。土壤C/N随着林下植被的增加而增加，树冠和短草坪草区之间的土壤C/N差异随着时间的推移而增加。城市绿地树冠区域的土壤特性意味着它们可以越来越多地缓冲氮肥的局部使用和大气氮沉降。担心地下水和水道氮污染的城市绿地管理者可以考虑在合适的地形位置种植树木，并促进林下植被和地表垃圾积累。
Soils in urban green spaces are an important carbon (C) store, but urban soils with a high carbon to nitrogen (C/N) ratio can also buffer N eutrophication from fertilizer use or atmospheric deposition. The influence of vegetation management practices on soil C cycling and C/N ratios in urban green spaces is largely unknown. In 2013, we collected replicate ( = 3) soil samples from tree canopy, tall grass, and short turf grass areas ( = 3) at four random plot locations ( = 4) established in 13 golf courses ( = 13). At each sample point, soil was separated into 0- to 0.1-, 0.1- to 0.2-, and 0.2- to 0.3-m depths (total = 1404). Linear mixed models investigated the relationships between soil properties, vegetation attributes, and green space age. Tree canopy soil was less compacted (1.07 g cm) than grassy areas (1.32 g cm). Similarly, tree canopy soil had mean C/N ratios of 17.2, as compared with between 14.2 and 15.3 in grassy areas. Soil properties in tree canopy areas were best explained by tree basal area and understory vegetation volume. Soil C/N increased with increasing understory vegetation, and the difference in soil C/N between tree canopy and short turf grass areas increased over time. The soil properties in tree canopy areas of urban green space mean they can increasingly buffer the localized use of N fertilizers and atmospheric N deposition. Managers of urban green spaces concerned about N pollution of groundwater and waterways could consider planting trees in suitable topographic locations and promoting understory vegetation and surface litter accumulation.