七叶树叶片营养与立地土壤状况的相关性分析

Study on the correlation between leaf nutrition and sitesoil condition of aesculus hippocastanum

摘要:

为了探讨行道树七叶树的叶片营养和立地土壤状况的相关性,以便七叶树能良好生长,充分发挥其生态功能,采用野外调查与室内试验分析相结合的方法,对兰州市主城区(城关、七里河、安宁和西固)的七叶树叶片及立地土壤分季节(夏季和秋季)进行分析。结果表明:(1)七叶树叶片含水量、全N、全K和全Cu含量夏季高于秋季;叶片叶绿素和全P含量表现为夏季较高;叶片Ca、Mg、Fe含量秋季高于夏季;(2)整体土壤状况表现为pH值偏高,有机质、水解N、交换性Mg、有效Cu和有效Fe的含量较低;(3)夏季叶片相对含水量与土壤交换性Ca和交换性Mg含量显著负相关(P＜0.05);叶绿素含量与土壤有效Cu和有效Fe含量显著正相关(P＜0.05);全N、P、K均与土壤交换性Ca含量极显著正相关(P＜0.01),与土壤交换性Mg显著正相关(P＜0.05);叶片中Cu含量与土壤速效N、P均呈显著负相关(P＜0.05);秋季叶片中交换性Ca含量与土壤速效N含量显著正相关(P＜0.05);其余的叶片营养元素含量和土壤养分含量之间的相关性均不显著。在今后的养护管理中应根据叶片和土壤的实际营养状况,结合不同生长期对养分的需求合理施肥。

Abstract:

This study aimed to explore the correlation between leaf nutrition of A. hippocastanum and their site soil condition in Lanzhou,therefore providing the information for its better growth to fulfil its full ecological function.Leaf patches of horse chestnut and its site soil were sampled from the field around the main urban area of Lanzhou (Ghengguan,Qilihe,Aning and Xigu Districtions) in different seasons (summer and autumn) and analyzed in laboratory.The results showed that leaf water content,leaf chlorophyll content and leaf total N,P,K and Cu contents were higher in summer than in autumn,while leaf Ca,Mg and Fe contents were higher in autumn than in summer.The overall soil pH was relatively high,while the contents of organic matter,hydrolyzed N,exchangeable Mg,available Cu and Fe in soil were low.Leaf relative water content in summer had a significant negative correlation with soil exchangeable Ca and Mg content (both P＜0.05).Leaf chlorophyll content and soil effective Cu and Fe showed a significant and positive correlation (P＜0.05).Soil total N,P and K all had significant and positive correlation with soil exchangeable Ca content (P＜0.01) as well as soil exchangeable Mg (P＜0.05).Leaf Cu content had a significant and negative correlation with both available N content and P content in soil (P＜0.05).There was a significant positive correlation between leaf exchangeable Ca content and soil available N content (P＜0.05),while no significant correlation between other leaf nutrient content and soil nutrient content was found.For the maintenance and management of A. hippocastanum,it would be important to fertilize appropriately based on the actual nutritional status of leaves and soil,and the nutrient demand in different growing stages.