Comparison of water consumption of three urban greening trees in a typical arid oasis city, northwest China
Comparison of water consumption of three urban greening trees in a typical arid oasis city, northwest China
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西北典型干旱绿洲城市三种城市绿化树木耗水量比较
DOI：
10.12854/erde-2018-352
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Martin Welp
中科院分区：
文献类型：
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作者：
Maierdang Keyimu;Ümüt Halik;Zongshan Li;Abdulla Abliz;Martin Welp
为保证干旱区绿洲城市的可持续发展，必须重视有限水资源的合理利用。由于城市植被是水的重要用户之一，城市绿化活动应适应当地的环境条件。在本研究中，一个本地（桑树alba L.）以及引进的两种城市绿化树种（白蜡（Fraxinus sogdiana Bunge）和悬铃木（Platanus acerifolia Willd.）在阿克苏-一个典型的绿洲城市在中国西北部选择。测定了它们的茎液流速（SFV），计算了它们的日耗水量.同时，记录气象变量，分析这些树种的耗水策略。结果表明，M. alba，F. sogdiana和P. acerifolia分别为4.1±0.3 cm h-1、10.5±0.7 cm h-1和22.3±2.6 cm h-1。SFV与太阳辐射（Rs）、气温（Ta）、水汽压差（VPD）、风速（Ws）呈正相关，与空气湿度（RH）呈负相关。逐步分析表明，VPD对F. sogdiana（R ~ 2 =0.987）和M.相对湿度对白背杨的影响最大（R2=0.887），而对槭叶杨的影响最大（R2=0.937）。槭叶松的日树液积累量最高（104±7 L树-1），F. sogdiana次之（52±4 L树-1），M.白色（16±2 L树-1）。水分利用效率（WUE）为M。alba（3.61 mmol mol-1）> F. sogdiana（3.33 mmol mol-1）> P. acerifolia（2.90 mmol mol-1）。这项研究表明，本土树种发展了某些适应干旱环境的策略，从而消耗较少的水。因此，我们建议景观规划师和其他决策者在选择树种时，在未来的城市绿化项目中应优先考虑乡土树种。
In order to ensure sustainable development of arid oasis cities, close attention must be paid to the rational use of limited water resources. Since urban vegetation is one important user of water, urban greening activities should be adapted to local environmental conditions. In this study, one native (Morus alba L.) and two introduced urban greening tree species (Fraxinus sogdiana Bunge and Platanus acerifolia Willd.) were selected in Aksu – a typical oasis city in northwest China. Their stem sap f low velocity (SFV) was determined and diel water consumption was calculated. In the meantime, meteorological variables were recorded to analyze the water consumption strategy of these tree species. The results show that the average SFV of M. alba, F. sogdiana and P. acerifolia were 4.1±0.3 cm h-1, 10.5±0.7 cm h-1 and 22.3±2.6 cm h-1, respectively. SFV was positively correlated with solar radiation (Rs), air temperature (Ta), vapor pressure deficit (VPD) and wind speed (Ws), and negatively correlated with air humidit y (RH). Stepwise analysis showed that VPD had the highest impact on SFV of F. sogdiana (R2=0.987) and M. alba (R2=0.887), while the impact of RH was highest on P. acerifolia (R2=0.937). P. acerifolia had the highest sap f low daily accumulation (104±7 L tree-1), F. sogdiana was second (52±4 L tree-1), and third was M. alba (16±2 L tree-1). The water use efficiency (WUE) was M. alba (3.61 mmol mol-1) > F. sogdiana (3.33 mmol mol-1) > P. acerifolia (2.90 mmol mol-1). This study showed that native tree species developed certain adaptation strategies to the arid environment and thus consumed less water. Therefore, we recommend that in tree species selection by landscape planners as well as other decision makers, native tree species should be given priority in future urban greening projects.