内蒙古呼和浩特市主要园林绿化树种叶片的生态功能分析

Analysis of Leaf Ecological Function of Main Garden Greening Tree Species in Hohhot,Inner Mongolia

以呼和浩特33种园林绿化树种为试材,通过测定叶片持水量、叶片滞尘量、叶片碳、氮、磷含量等指标,研究了呼和浩特市主要园林绿化树种叶片5个方面的相关生态环境功能,以期为干旱和半干旱城市园林绿化树种的选择提供参考依据。结果表明:1)不同树种叶片的各项生态功能均有显著差异,叶片持水力强弱值范围为0.06~1.42 g·g^(-1),最低为紫花槐,最高为灰栒子;叶片滞尘力强弱值范围为1.54~29.70 g·kg^(-1),最低为落叶松,最高为油松;叶片氮含量高低值范围为6.68~34.40 g·kg^(-1),最低为白桦,最高为紫花槐;叶片磷含量高低值范围为0.03~0.36 g·kg^(-1),最低为槭树,最高为臭柏;叶片有机碳含量值范围为358.11~645.42 g·kg^(-1),最低为红柳,最高为辽东栎;2)持水力总体是阔叶树种较强,而滞尘力是针叶树种强于阔叶树种,豆科树种氮含量最高,磷含量的树种以臭柏、红瑞木和垂柳最高,有机碳含量以辽东栎和臭柏最高,而综合功能以臭柏、辽东栎、文冠果、油松和樟子松功能最为突出;3)持水力与其它各项功能呈负相关关系,而滞尘力与其它各功能呈正相关关系,氮和磷的含量呈正相关关系,二者与有机碳含量呈负相关关系。

Taking 33 landscaping tree species in Hohhot as test materials,the leaf water capacity,leaf dust retention,leaf carbon,nitrogen and phosphorus content were measured,the relevant eco-environmental functions of the leaves of main landscaping tree species in Hohhot were studied,in order to provide reference for the selection of landscaping tree species in arid and semi-arid cities.The results showed that,1)there were significant differences in various ecological functions of leaves of different tree species.The range of leaf water holding capacity was 0.06-1.42 g·g^(-1),the lowest was Robinia pseudoacacia cv.idaho and the highest was Cotoneaster acutifolius;the range of dust retention capacity of leaves was 1.54-29.70 g·kg^(-1)the lowest was Larix gmelinii and the highest was Pinus tabuliformis;the nitrogen content in leaves ranged from 6.68 g·kg^(-1)to 34.40 g·kg^(-1),the lowest was Betula platyphylla Suk and the highest was Robinia pseudoacacia;the phosphorus content in leaves ranged from 0.03 g·kg^(-1)to 0.36 g·kg^(-1),the lowest was Acer L.and the highest was Sabina vulgaris;the organic carbon content of leaves ranged from 358.11 g·kg^(-1)to 645.42 g·kg^(-1),the lowest was Tamarix ramosissima,and the highest was Quercus wutaishansea.2)Generally,the water holding capacity of broad-leaved trees was stronger,while the dust holding capacity of coniferous trees was stronger than that of broad-leaved trees.The nitrogen content of Leguminous trees was the highest,the phosphorus content of Sabina vulgaris,Swida alba and Salix babylonica was the highest,the organic carbon content of Quercus wutaishansea and Sabina vulgaris was the strongest,and the comprehensive functions of Sabina vulgaris,Quercus wutaishansea,Xanthoceras sorbifolium Bunge,Pinus tabulaeformis and Pinus sylvestris were the most prominent.3)The water holding capacity was negatively correlated with other functions,but the dust holding capacity was positively correlated with other functions,the contents of nitrogen and phosphorus were positively correlated,and negatively correlated with the content of organic carbon.