生境改良对锦绣杜鹃生长的影响

Effects of Habitat Improvement on Growth of Rhododendron pulchrum

为探究生境改良对锦绣杜鹃生长的影响,提升杜鹃栽植效果和观赏性状,测定了白云山麓湖公园鸿鹄山入口三角位置(W1)、鸿鹄楼附近(W2)和翠云亭周边(W3)3个种植区不同年度锦绣杜鹃成活率、不同长势杜鹃SPAD值、开花情况、根系生长指标及土壤理化指标,并分析了各指标间的相关性。结果表明:生境改良显著降低了土壤pH值和容重,显著提高了土壤EC、有机质含量、含水量和入渗率;生境改良后,3个种植区杜鹃生长势和开花情况较好,根系生长更佳。相关性结果显示,杜鹃根系延伸长度与土壤有机质含量呈极显著正相关,与土壤容重呈显著负相关,与土壤入渗率呈显著正相关;着花量与土壤入渗率呈显著正相关。综上说明,生境改良显著改善了锦绣杜鹃立地的土壤质量,有效促进了锦绣杜鹃根系生长、营养吸收与开花,此锦绣杜鹃栽培措施值得推广应用。

In order to explore the effect of habitat improvement on the growth of Rhododendron pulchrum Sweet and improve the planting effect and ornamental characteristics of Rhododendron.The survival rate of Rhododendron pulchrum,SPAD value,flowering situation,root growth index and soil physical and chemical index of Rhododendron pulchrum in different years in three planting areas of Honghushan entrance triangle position(W1),near Honghulou(W2)and around Cuiyunting(W3)in Baiyun Mountain Luhu Park were measured,and the correlation of each index was analyzed.The results showed that habitat improvement significantly reduced soil pH value and bulk density,and significantly increased EC value,organic matter content,water content and infiltration rate.After habitat improvement,the growth potential and flowering of Rhododendron in the three planting areas were better,and the root growth was better.The correlation results showed that the root extension length of Rhododendron was significantly correlated with soil organic matter content,significantly negatively correlated with soil bulk density,and significantly positively correlated with soil infiltration rate.In summary,habitat improvement significantly improved the soil quality of Rhododendron pulchrum site,and effectively promoted the root growth,nutrient absorption and flowering of Rhododendron pulchrum.This cultivation measure of Rhododendron pulchrum is worthy of popularization and application.