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首页> 外文期刊>Journal of Arboriculture >Which comes first, the root or the crack?
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Which comes first, the root or the crack?

机译：根源还是裂缝？

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摘要

The Ohio State University and the City of Cincinnati Park Board conducted a study of street trees in Cincinnati, Ohio, U.S., during the summers of 1999 and 2000. lour genera of trees were examined from four different plant families. Approximately 600 trees planted within the past 20 years were observed. The condition of the nearest sidewalk joint and the incidence of a root for Quercus (oak), Koelreuterta (goldenraintree), Zelkova (zelkova), and Gleditsia phoney locust) were observed. All genera responded similarly in that roots were more likely to be found under a crack in the sidewalk than under an intact sidewalk. During the first 20 years after planting, tree roots are more likely to be found underneath a sidewalk crack than an intact sidewalk. Of 351 joints observed with no roots, 39 percent were intact and 61 percent were cracked. Of the 260 joints where roots were observed, only 16.2 percent were intact while 83.9 percent were cracked. Oxygen measurements were made underneath selected sidewalks. Oxygen concentrations were compared tor soil underneath cracked and intact sidewalk blocks. The soil underneath cracked sidewalks showed a higher concentration of oxygen. This higher oxygen concentration may contribute to root growth underneath cracked sidewalks.
机译：俄亥俄州立大学和辛辛那提市议会委员会在1999年和2000年夏天对美国俄亥俄州辛辛那提市的行道树进行了研究。研究了来自四个不同植物科的树木的树属。在过去的20年中，观察到大约种植了600棵树。观察到最近的人行道关节的状况以及栎（橡树），Koelreuterta（金雨树），Zelkova（zelkova）和Gleditsia刺槐的根发生率。所有属的反应都相似，因为在人行道上的裂缝下发现的根比在完整的人行道下发现的根更容易。在种植后的前20年中，与完整的人行道相比，更可能在人行道裂缝下找到树根。在观察到的无根的351个关节中，有39％完好无损，有61％破裂。在260个观察到根部的关节中，只有16.2％完整，而83.9％破裂。在选定的人行道下进行氧气测量。比较了开裂和完整人行道下方土壤的氧气浓度。破裂的人行道下面的土壤显示出较高的氧气浓度。较高的氧气浓度可能会导致人行道下的根部生长。

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