Photosynthetic Characteristics, Soil Nutrients And Leaf Nutrient Content Of Common Landscape Plants In Coastal Areas Of Guangdong Province

In this study, garden plants the photosynthetic characteristics, nutrient content of leaves and soil were analyzed in Hailing Island of Yangjiang, Hengqin of Zhuhai and Nansha of Guangzhou, Guangdong Province. Results showed that photosynthetic rate of plants decreased in the order of Ipomoea pes-caprae> Duranta repens ‘Variegata’> Dianella ensifolia‘White Variegated’> Schefflera arboricola > Cordyline fruticosa in Hailing Island, in the order of Crack phildendr on Phildendron sellomn > Alpinia zerumbet ‘Variegata’> Schefflera odorata ‘Variegata’> Excoecaria cochinchinensis > Cordyline fruticosa > Ficus elastica > Allamanda schottii > Ficus microcarpa‘Golden Leaves’ > Hibiscus rosa-sinensis > Sansevieria trifasciata in Hengqin and in the order of Hymenocallis littoralis.>Schefflera arboricola > Hibiscus rosa-sinensis > Belamcanda chinensis>Green Cordyline fruticosa > Schefflera odorata ‘Variegata’ > Cordyline fruticosa in Nansha.The contents of C, N, K and P in plant leaves were 358.07- 503.60, 8.68-23.88, 1.02-2.92 and 10.40-23.92 g/kg in Hailing Island, 335.82-483.68, 9.79-31.63, 1.25-3.23 and 5.25-22.58 g/kg in Henqin and 363.92-491.49, 9.65-33.53, 1.36-2.90 and 11.25-24.74 g/kg in Nansha, respectively. The Na content in leaves was 0.65-8.49, 0.17-14.80 and 0.13-10.64 g/kg in Hailing Island, Hengqin and Nansha, respectively.Soil p H of Ipomoea pes-caprae(8.06) is the highest, and soil p H of Duranta repens ‘Variegata’(5.53) is the lowest in Hailing Island; soil p H of Cordyline fruticosa(8.15) is the highest, and soil p H of Calliandra haematocephala(6.04) is the lowest in Hengqin; soil p H of Hymenocallis littoralis.(8.38) is the highest, and soil p H of Ruellia tuberose(5.87) is the lowest in Nansha. Soil organic matter of Duranta repens ‘Variegata’(7.57 g/kg) is the highest, and soil organic matter of Ipomoea pes-caprae(1.33 g/kg) is the lowest in Hailing Island; soil organic matter of Schefflera odorata ‘Variegata’(21.63g/kg) is the highest, and soil organic matter of Duranta repens(3.86g/kg) is the lowest in Hengqin; soil organic matter of Schefflera arboricola(24.78g/kg) is the highest, and soil organic matter of Ruellia tuberosa(8.34g/kg) is the lowest in Nansha.There were significant differences in total N、total P、total K and available N、available P and available K contents among the three studied sites.The photosynthetic index and leaf nutrient indexes were used for cluster analysis. The plants of Hailing Island were divided into three classes: Duranta repens ‘Variegata’ belonged to the first class, the second class included Dianella ensifolia‘White Variegated’, Schefflera arboricola,Cordyline fruticosa and the third class included Ipomoea pes-caprae. The plants of Hengqin were divided into five categories, the first kind included Hibiscus rosa-sinensis and Allamanda schottii, the second kind included Ficus microcarpa ‘ Golden Leaves’, Phildendron sellomn, Schefflera odorata ‘Variegata’, Alpinia zerumbet `Variegata’ and Cordyline fruticosa. Ficus elastica, Excoecaria cochinchinensis and Sansevieria trifasciata belonged to the three, the fourth and the fifth class, respectively. The plants of Nansha were divided into four categories: first class included Cordyline fruticosa and Belamcanda chinensis, the second class included Schefflera odorata ‘Variegata’, Schefflera arboricola and green Cordyline fruticosa. Hymenocallis littoralis and Hibiscus rosa-sinensis belonged to the third class and the fourth class.The soil nutrient indexes were used for cluster analysis. Soils under the plants of Hailing Island were divided into six categories, the first category included Belamcanda chinensis, Pandanus tectorius, Codiaeum variegatum, Allamanda schottii and Hibiscus rosa-sinensis, the second category included Cordyline fruticosa, Alpinia zerumbet `Variegata’ and Dianella ensifolia‘White Variegated’, Duranta repens ‘Dwarf Yellow’ belonged to the third class,the fourth class included Ficus elastica, Bougainvillea spectabilis, Ipomoea pes-caprae and Ruellia tuberosa, Schefflera arboricola and Duranta repens ‘Variegata’ belonged to the fifth class and the sixth class, respectively. Generally, the soil fertility decreased in the order of soil under the sixth class plant> soil under the third type plant> soil under the first plants> soil under the fifth plants> soil under the second category plants> soil under the fourth type plants. Soils under the plants of Hengqin were divided into five categories, the first category included Phildendron sellomn, Ficus microcarpa ‘Golden Leaves’, Duranta repens, Hibiscus rosa-sinensis, Cordyline fruticosa, Sansevieria trifasciata, Excoecaria cochinchinensis, Ruellia tuberosa, Ophiopogon intermedius ‘Argenteo-marginatus’, Lantana camara and Ficus elastica, Allamanda schottii belonged to the second category, the third category included Calliandra haematocephala and Aglaia odorata, and Schefflera odorata ‘Variegata’ and Alpinia zerumbet `Variegata’ belonged to the fourth class and the fifth class, respectively. Generally, the soil fertility decreased in the order of soil under the fourth sorting plants> soil under the fifth plants> soil under the second type of plant> soil under the third type plant> soil under the first plants. Soils under the plants of Nansha were divided into four categories, the first category included Dracaena angustifolia, Ophiopogon intermedius‘Argenteo-marginatus’, Hymenocallis littoralis, Cordyline fruticosa and green Cordyline fruticosa and Schefflera odorata ‘Variegata’, and the second class included Belamcanda chinensis and Ruellia tuberosa, Hibiscus rosa-sinensis belonged to the third class, the fourth class included Duranta repens ‘Dwarf Yellow’ and Schefflera arboricola. Generally, the soil fertility decreased in the order of soil under the fourth plants> soil under the third type plants> soil under the first plants> soil under the second type plants.