Estimation and Correlation of Surian Leaves (Toona Sinensis) Weight with the Tree Parameters

Abstract

Leaves of surian tree (Toona sinensis) based on the research, can be used for medications, such as diabetes, cancer, and others. At the present the people is being switched from chemical drugs to herbal medicines. Therefore, surian leaves is one source of herbal medicine to be developed in the future. However, information of leaves biomass in each tree relating to ages and tree parameters is unknown. This study aims to determine the weight of surian leaves on each tree and to examine the relationship of leaves weight with several tree dparameters. The study was conducted on private forests in Sumedang District. The sample of 110 trees were taken purposively. Tree parameters were measured, namely: Diameter Breast Height (DBH), total height, timber height, crown height, crown diameter, age, and leaves weight of each tree. The results of the correlation analysis showed that there was a significant relationship between four parameters of the tree, namely DBH, total height, crown height, and crown diameter with surian leaves weight. The highest correlation with the weight of surian leaves is DBH, amounting to 0.75. Estimated weight of leaves in DBH 10-19 cm is 8-11 kg/tree. Whereas for DBH above equal to 20 cm is 18-23 kg/tree.

Flavonol profiles of mature leaves allow discriminating Toona sinensis Roem from different north-south geographical origins across China with varied antioxidant activities

“…The TFC was much higher than commonly consumed vegetables and fruits (often less than 300 mg/100 g FW) [ 9 ], and was comparable to the green leaves of G. biloba (about 755 mg/100 g FW) [ 46 ]. Considering the fast-growing nature and large biomass of T. sinensis leaves [ 26 ], the mature leaves of T. sinensis are quality potential resources for the extraction and refining of natural flavonols. However, significant regional characteristics were also uncovered in the TFC of T. sinensis ( p < 0.05).…”

“…The flavonoid content and antioxidant activity of mature leaves (grown for over three months) of T. sinensis have been reported to be even higher than that of Ginkgo biloba leaves [ 25 ]. Moreover, the estimated biomass of mature leaves from T. sinensis with a diameter breast height (DBH) of 10–19 cm was measured to be 8–11 kg/tree, and with a DBH of 20–45 cm, the level increased to 18–23 kg/tree [ 26 ]. Flavonoids in plant leaves are primarily flavonols, including T. sinensis [ 1 , 23 , 27 ].…”