摘要: 目的植物叶片碳（C）、氮（N）、磷（P）含量及其比值是植物长期适应环境的结果，研究西北干旱区域园林木本植物叶片化学计量特征可以为同类城市园林木本植物的精准规划及大尺度模型的构建提供数据基础、�/sec> 方法该研究对兰州市主城区（七里河区、安宁区、西固区�?2种常见园林木本植物叶片的C、N、P化学计量特征进行了分析。将42种植物按照乔木（26种）和灌木（16种）、常绿（7种）和落叶（35种）及针叶（5种）和阔叶（37种）进行分类，分析不同生活型植物叶片C、N、P、C∶N、C∶P和N∶P的变异特征及与比叶重（LMA）的关系、�/sec> 结果�?�?2种园林木本植物叶片平均C含量�?9.67%、N含量�?.45%、P含量�?.17%，C∶N、C∶P和N∶P平均值分别为17.17�?32.98�?4.72。与全球尺度相比，兰州市木本植物叶片C、P含量和C∶N相对较低，而叶片N∶P相对较高。（2）不同生活型植物化学计量特征不同，乔木叶片C含量、C∶N、C∶P和N∶P高于灌木，而N和P含量低于灌木；落叶树种叶片N、P含量高于常绿树种；阔叶树种叶片N、P含量高于针叶树种。（3）对植物叶片性状之间的相互关系分析显示：植物叶片C含量与C∶N、C∶P呈极显著正相关（ P< 0.01）；LMA与叶片C含量表现出协同关系，与叶片N、P含量均表现出相反的关系、�/sec> 结论初步判定兰州市园林木本植物在生长季受N元素的限制，建议在本区域生态环境治理时可适当增施N肥、�/sec>

关键诌�
• 兰州币�/a> /
• 园林木本植物/
• 化学计量特征/
• 叶片

Abstract: ObjectiveThe contents and ratios of carbon (C), nitrogen (N) and phosphorus (P) in plant leaves are the results of long-term adaptation of plants to the environment. Study of leaf stoichiometry characteristics of woody landscape plants in arid areas of northwest China can provide a data basis for the accurate planning and construction of large-scale models of planting in similar cities. MethodIn this study, the C, N and P stoichiometric characteristics of 42 common woody landscape plants in the main urban district of Lanzhou (Qilihe, Anning and Xigu) were analyzed. The 42 plant species were classified into trees (26 species) and shrubs (16 species), evergreen (7 species) and deciduous (35 species), coniferous leaves (5 species) and broad-leaved (37 species). Variation characteristics of leaves’contents of C, N, P, C∶N, C∶P and N∶P of different life types were analyzed, and the relationship between the variation characteristics and specific leaf weight (LMA). Results(1) The average content of C, N and P of 42 woody landscape plants were 39.67%, 2.45% and 0.17%, respectively. The average C∶N, C∶P and N∶P were 17.17, 232.98 and 14.72, respectively. Compared with the global scale, the contents of C and P and C∶N in leaves of woody plants in Lanzhou were relatively low, while the contents of N∶P in leaves were relatively high. (2) Stoichiometry characteristics are varied among plant life types. The C content, C∶N, C∶P and N:P of the leaves of trees are higher than those of shrubs, and the content of N and P is lower than that of shrubs. The leaf N and P content of deciduous tree species is higher than that of evergreen tree species. The leaves of broad-leaved tree species have higher leaf N and P content than coniferous tree species. (3) The analysis of the correlation between plant leaf traits showed that leaf C content was positively correlated with C∶N and C∶P ( P< 0.01). There was a synergistic relationship between LMA and leaf C content, but an opposite relationship between LMA and leaf N and P content. ConclusionIt is preliminarily indicated that the development of woody landscape plants in Lanzhou are limited by N elements during the growing season, and it is suggested that nitrogenous fertilizer can be increased appropriately during the ecological environmental improvement in this area.

Key words:
• Lanzhou/
• woody landscape plants/
• stoichiometric characteristics/
• leaves

�?nbsp; 1乔木与灌木间植物叶片化学计量特征比较

箱线图上方字母相同表示不同生活型间无显著差异＇�i>P >0.05），字母不同表示差异显著＇�i>P< 0.05）；虚线表示平均值的位置；中间横线为中位线；误差线上下沿表示极大值和极小值。下同。The same letters above the box chart indicate that there is no significant difference between different life forms (P> 0.05), while different letters indicate significant difference (P< 0.05). The dotted line indicates the position of the average value. The middle horizontal line is the median line. The lower edge of the error line represents the maximum and minimum. The same as below.

Figure 1.Comparison of plant leaf stoichiometry characteristics between tree and shrub

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�?nbsp; 2常绿与落叶树种间植物叶片化学计量特征比较

Figure 2.Comparison of plant leaf stoichiometry characteristics between evergreen and deciduous species

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�?nbsp; 3针叶与阔叶树种间植物叶片化学计量特征比较

Figure 3.Comparison of plant leaf stoichiometry between coniferous and broadleaf species

下载: 全尺寸图牆�/a> 幻灯牆�/a>

�?nbsp; 4植物叶片C、N、P含量与LMA间的关系

LMA. 比叶重。LMA, leaf mass per area.

Figure 4.The relationship between C, N, P content and LMA in plant leaf

下载: 全尺寸图牆�/a> 幻灯牆�/a>

�?nbsp; 1兰州�?2种常见园林木本植物名彔�/p>

Table 1.Plant list of 42 common woody landscape plants in Lanzhou

�?灋�br/>Tree/ Shrub	常绿/落叶 Evergreen/ Deciduous	物种中文同�br/>Chinese name of species	物种拉丁同�br/>Latin name of species	秐�br/>Family	屝�br/>Genus	针叶/阔叶 Coniferous/ Broadleaf
乔木 Tree	常绿 Evergreen	圆柏	Juniperus chinensis	柏科 Cupressaceae	刺柏�Juniperus	针叶 Coniferous
		侧柏	Platycladus orientalis	柏科 Cupressaceae	侧柏�Platycladus
		樟子杽�/td>	Pinus sylvestris	松科 Pinaceae	松属Pinus
		雪松	Cedrus deodara	松科 Pinaceae	雪松�Cedrus
		云杉	Picea asperata	松科 Pinaceae	云杉�Picea
	落叶 Deciduous	国槐	Styphnolobium japonicum	豆科 Fabaceae	槐属Styphnolobium	阔叶 Broadleaf
		杜仲	Eucommia ulmoides	杜仲� Eucommiaceae	杜仲�Eucommia
		臭椿	Ailanthus altissima	苦木� Simaroubaceae	臭椿�Ailanthus
		香椿	Toona sinensis	楝科 Meliaceae	香椿�Toona
		玉兰	Yulania denudata	木兰� Magnoliaceae	玉兰�Yulania
		七叶栐�/td>	Aesculus chinensis	无患子科 Sapindaceae	七叶树属Aesculus
		五角�?/td>	Acer pictumsubsp.mono	无患子科 Sapindaceae	槭属Acer
		元宝�?/td>	Acer truncatum	无患子科 Sapindaceae	槭属Acer
		紫叶杍�/td>	Prunus cerasifera	蔷薇� Rosaceae	李属Prunus
		西府海棠	Malus × micromalus	蔷薇� Rosaceae	苹果�Malus
		桂�/td>	Amygdalus persica	蔷薇� Rosaceae	桃属Amygdalus
		白杜	Euonymus maackii	卫矛� Celastraceae	卫矛�Euonymus
		毛泡桏�/td>	Paulownia tomentosa	泡桐� Paulowniaceae	泡桐�Paulownia
		二球悬铃�?/td>	Platanus acerifolia	悬铃木科 Platanaceae	悬铃木属Platanus
		垂柳	Salix babylonica	杨柳� Salicaceae	柳属Salix
		旱柳	Salix matsudana	杨柳� Salicaceae	柳属Salix
		河北�?/td>	Populus × hopeiensis	杨柳� Salicaceae	杨属Populus
		新疆�?/td>	Salix albavar.pyramidalis	杨柳� Salicaceae	柳属Salix
		银杏	Ginkgo biloba	银杏� Ginkgoaceae	银杏�Ginkgo
		榆树	Ulmus pumila	榆科 Ulmaceae	榆属Ulmus
		栾树	Koelreuteria paniculata	无患子科 Sapindaceae	栾属Koelreuteria
灌木 Shrub	常绿 Evergreen	大叶黄杨	Buxus megistophylla	黄杨� Buxaceae	黄杨�Buxus
		小叶黄杨	Buxus sinicavar.parvifolia	黄杨� Buxaceae	黄杨�Buxus
	落叶 Deciduous	木槿	Hibiscus syriacus	锦葵� Malvaceae	木槿�Hibiscus
		金钟芰�/td>	Forsythia viridissima	木樨� Oleaceae	连翘�Forsythia
		连翘	Forsythia suspensa	木樨� Oleaceae	连翘�Forsythia
		金叶女贞	Ligustrum × vicaryi	木樨� Oleaceae	女贞�Ligustrum
		紫丁馘�/td>	Syringa oblata	木樨� Oleaceae	丁香�Syringa
		紫叶矮樱	Prunus × cistena	蔷薇� Rosaceae	李属Prunus
		黄刺�?/td>	Rosa xanthina	蔷薇� Rosaceae	蔷薇�Rosa
		玫瑰	Rosa rugosa	蔷薇� Rosaceae	蔷薇�Rosa
		月季芰�/td>	Rosa chinensis	蔷薇� Rosaceae	蔷薇�Rosa
		天目琼花	Viburnum opulussubsp.calvescens	五福花科 Adoxaceae	荚蒾�Viburnum
		红瑞�?/td>	Cornus alba	山茱萸科 Cornaceae	山茱萸属cornus
		紫叶小檗	Berberis thunbergii ‘Atropurpurea‘�/i>	小檗� Berberidaceae	小檗�Berberis
		紫荆	Cercis chinensis	豆科 Fabaceae	紫荆�Cercis
		紫薇	Lagerstroemia indica	千屈菜科 Lythraceae	紫薇�Lagerstroemia

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�?nbsp; 2兰州�?2种园林木本植物C、N、P及其比倻�/p>

Table 2.C, N, P and their ratios of 42 woody landscape plants in Lanzhou

计量特征 Stoichiometry	算术平均倻�br/>Arithmetical mean	中位�?br/>Median	极大倻�br/>Maximum	极小倻�br/>Minimum	变异系数 Variable coefficient (%)
� Carbon (C)	39.67 ± 1.33	38.63	62.91	26.68	0.22
� Nitrogen (N)	2.45 ± 0.09	2.48	3.84	1.52	0.24
� Phosphorus (P)	0.17 ± 0.01	0.17	0.34	0.10	0.36
C∶N	17.17 ± 0.72	18.23	27.53	8.14	0.27
C∶P	232.98 ± 13.16	227.06	456.98	95.09	0.32
N∶P	14.72 ± 0.82	14.50	24.62	5.00	0.32

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�?nbsp; 3兰州�?2种园林木本植物C、N、P及其化学计量比间的关糺�/p>

Table 3.The relationship between C, N, P and the chemichiometric ratio of 42 woody landscape plants in Lanzhou

指标 Index	C	N	P	C∶N	C∶P	N∶P
C	1
N	0.179	1
P	0.026	0.445*	1
C∶N	0.546**	�?.664**	0.111	1
C∶P	0.466**	0.001	�?.793**	0.245	1
N∶P	0.047	0.420**	�?.814**	�?.419**	0.750**	1
*表示�?i>P< 0.05水平差异显著�?*表示�?i>P< 0.01水平差异显著�? Indicates a significant difference at theP< 0.05 level. ** indicates a significant difference at theP< 0.01 level.

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