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“Tulip Tree Leaf Waste :\nFallen and fresh L. tulipifera leaves were collected from the Kagawa University Faculty of Agriculture campus in November 2020 and July 2021, respectively. Fresh leaves served as a substitute for waste generated during logging operations. The leaves were dried under shade conditions before use. Weed species V. myuros, E. crus-galli, and L. multiflorum were selected as bioassay test plants, while L. sativum was used in bioassay-guided separation due to its high and stable germination rate. Fresh leaf extracts were prepared and tested for allelopathic activity using published methodologies. Seeds of test species were germinated in darkness at 25 °C for 48 hours before being exposed to leaf extracts in Petri dishes. Growth measurements were taken after 48 hours. The assay solution contained extract concentrations equivalent to 1, 3, 10, 30, or 100 mg of L. tulipifera leaves per mL. The experiment was repeated four times per species, with 10 seedlings per test. The same procedure was used for fallen leaf extracts. Allelopathic Activity Under Greenhouse Conditions:\nGreenhouse experiments were conducted following published protocols. Fresh and fallen leaf powders were applied to soil in pots at dosages of 0 (control), 0.21, 0.7, 2.1, 7, and 21 g per pot. After nine days, 100 E. crus-galli seeds were sown per pot and germinated under natural daylight conditions. Germinated seeds were counted after 14 days. The experiment was repeated four times.Isolation and Identification of Allelochemicals:\nA bioassay-guided separation process was employed to isolate allelochemicals from fresh and fallen leaves using chromatography techniques. The active compound, identified as lipiferolide, was characterized via spectral analysis (HRESI-MS and NMR). Fresh leaf extracts significantly inhibited coleoptile and root growth of V. myuros, E. crus-galli, and L. multiflorum at concentrations ≥ 10 mg/mL. Fallen leaf extracts showed similar inhibition at higher concentrations (≥ 30 mg/mL). L. sativum growth was also suppressed, with fresh leaf extracts exhibiting stronger effects than fallen leaf extracts. In greenhouse experiments, fresh and fallen leaf powders suppressed E. crus-galli germination at dosages ≥ 0.7 g and 2.1 g per pot, respectively. The bioassay-guided separation process identified lipiferolide as the active allelochemical. Lipiferolide exhibited dose-dependent inhibition of L. sativum and L. multiflorum growth. This marks the first report of lipiferolide’s allelopathic activity. Conclusions: L. tulipifera fresh and fallen leaf extracts and powders exhibited allelopathic activity against weed species under laboratory and greenhouse conditions. Lipiferolide, identified as the active compound, inhibited plant growth in a concentration-dependent manner. These findings suggest that fresh and fallen L. tulipifera leaves can be utilized as soil amendments or foliar sprays for weed control. Utilizing leaf waste for weed management could reduce environmental impacts and economic concerns associated with waste disposal.
"Tulip Tree Leaf Waste :\nLogging operations of Liriodendron tulipifera L. as timber trees and fallen leaves from ornamental trees produce significant amounts of leaf waste. This study investigated the allelopathy of L. tulipifera fresh and fallen leaves to explore potential applications of leaf waste. Extracts from fresh and fallen leaves exhibited growth inhibitory activity against weed species Vulpia myuros (L.) C.C.Gmel., Echinochloa crus-galli (L.) P.Beauv., and Lolium multiflorum Lam. under laboratory conditions. The powder of fresh and fallen leaves also inhibited the germination of E. crus-galli under greenhouse conditions. A potent allelochemical, lipiferolide, was isolated from fresh and fallen leaf extracts through a bioassay-guided separation process. Lipiferolide inhibited the growth of L. multiflorum and Lepidum sativum in a concentration-dependent manner. These findings suggest that L. tulipifera leaf waste from logging operations and fallen leaves could be utilized for weed control, either as a soil additive material or as a foliar spray. Developing weed control materials from L. tulipifera leaf waste may help minimize waste, reducing environmental impacts and economic concerns. Liriodendron tulipifera L., a member of the Magnoliaceae family, is a hardwood tree that grows to heights of 25–40 m and trunk diameters of 1–2 m. Its palmately lobed leaves measure 10–15 cm in length and width. Native to eastern North America, L. tulipifera has been introduced to various temperate regions in Europe and East Asia. It is widely cultivated as an ornamental tree along residential streets, in parks, and in gardens. L. tulipifera is also valued for honey production, with a single 20-year-old tree capable of producing 3.6 kg of nectar per season, equivalent to 1.8 kg of honey. Due to its rapid growth and tall, straight trunks, the species is commercially valuable as timber, with an average dry weight of 455 kg/m³ and a hardness of 2400 N. The wood is widely used in furniture, interior finishing, and plywood. However, logging operations generate large quantities of industrial waste, including leaves, branches, bark, and stumps, with an estimated 80% of total tree biomass being discarded. Reducing this waste could contribute to the sustainability of timber production systems and mitigate environmental impact. Various studies have explored potential uses for L. tulipifera waste, such as charcoal, bio-oil, solid fuel, and bioethanol. Additionally, L. tulipifera’s deciduous nature results in fallen leaves accumulating on streets, parks, and gardens in autumn, requiring costly management. Despite these waste management challenges, little research has been conducted on the potential applications of leaf waste."
“Introduction Tulip Water Efficiency :\nThe study examines intrinsic water use efficiency (iWUE) trends in two broadleaf tree species, northern red oak (Quercus rubra, Quru) and tulip poplar (Liriodendron tulipifera, Litu), in the central Appalachian Mountains of the eastern United States. The research investigates whether iWUE has changed since the mid-20th century, whether changes are primarily due to alterations in net photosynthesis (Anet) or stomatal conductance (gs), and which environmental factors drive these trends. The study considers the impact of rising atmospheric CO2 (iCO2), climate variability, and acidic pollution from coal-fired power plants. The study focused on four mature, unmanaged forest stands in the mid-Atlantic region spanning a latitudinal transect of approximately 170 km. The sites included Powdermill Nature Reserve (PNR), Watershed 10 (WS10) and Watershed 13 (WS13) in the Appalachian Plateau, and the Smithsonian Conservation Biology Institute (SCBI) in the Valley and Ridge province. Tree increment cores were collected from at least 20 mature trees per species at each site, ensuring selection across size classes to avoid bias. The cores were processed using dendrochronological methods, with growth rings measured and crossdated for the period 1940–2015. Carbon Isotope Analysis: A subset of increment cores was analyzed for carbon isotope composition (δ13C) to reconstruct historical iWUE. Standard methods were used for sample preparation, including grinding tree rings into fine powder and analyzing the carbon isotope ratio with a mass spectrometer. From δ13C values, leaf intercellular CO2 concentration (Ci) and iWUE were calculated. Additionally, contemporary measurements of leaf photosynthesis and stomatal conductance were taken during the 2016 growing season to reconstruct historical Anet and gs trends.”
“Tulip Tree Fire-Disturbed Status:\nResults - Growth Response: Foliar growth parameters varied significantly among tree species and in response to fertilization. The leaf area of LT, PY, and PT increased after fertilization, whereas QA showed no response. Dry weight increased significantly for LT and QA under the N6P4K1 treatment. Leaf area and dry weight were lower in June but increased in August and October, suggesting seasonal influences on foliar growth. Specific leaf area showed a marginal response to fertilization and was significantly affected by tree species and sampling month. Results - Nutrient Response: Carbon concentrations were not significantly affected by fertilization, indicating that C concentration in foliage is influenced by genetic and environmental factors rather than soil nutrient availability. Foliar N concentrations increased after fertilization, but there was no significant difference between the N3P8K1 and N6P4K1 treatments. The lowest N concentrations were observed in October, likely due to resorption before leaf fall. The C/N ratio was higher in PT than in broadleaf species and was highest in October, further supporting the role of nutrient resorption. Foliar phosphorus concentrations increased with fertilization, suggesting P deficiency in the fire-disturbed urban forest. However, the dose of P in the fertilizer did not significantly affect foliar P levels, likely due to luxury consumption. PY exhibited the highest P concentration among the four species. Potassium concentration and content were largely unaffected by fertilization, except in PY, which had higher foliar K due to higher soil K availability at its planting site. Discussion - Growth Responses: Fertilization generally increased leaf area but had a limited effect on foliar dry weight and specific leaf area. The response to fertilization varied among tree species, possibly due to differences in carbon allocation patterns. Seasonal differences in growth were attributed to foliage maturation and resource allocation dynamics. The limited effect of fertilizer dosage on morphological parameters suggests potential micronutrient imbalances or multi-factorial environmental influences. Discussion - Nutrient Responses: Carbon concentrations in foliage were primarily determined by species-specific traits rather than fertilization. The increased foliar N and P concentrations with fertilization indicate that these nutrients were limiting factors for tree growth in the fire-disturbed urban forest. The lack of a significant response to different fertilizer ratios suggests that tree species absorbed nutrients according to their physiological needs rather than the absolute availability of nutrients in the soil. Potassium was relatively unaffected by fertilization, suggesting that its availability was not a limiting factor. Conclusions: Fertilization improved foliar N and P concentrations but had limited effects on foliar C and K levels. Growth parameters such as leaf area and dry weight were influenced by fertilization but varied among species. Seasonal changes in nutrient concentrations suggest that trees resorb nutrients before leaf fall. The lack of significant differences between fertilizer ratios suggests that high doses of N and P resulted in luxury consumption rather than increased growth. These findings indicate that optimal fertilization strategies should consider species-specific nutrient requirements to enhance tree growth in fire-disturbed urban forests.”
“Tulip Tree Leaf Waste :\nThe bark of L. tulipifera has been traditionally used as an antipyretic treatment for malaria. Pharmacological studies have identified numerous secondary metabolites, including alkaloids, lignans, terpenes, flavonones, and steroids, in its wood, roots, and leaves. Some of these compounds exhibit pharmacological activity, yet their allelopathic properties remain unexplored. Allelopathy refers to the chemical interaction between donor and receiver plants, in which donor plants release secondary metabolites, known as allelochemicals, into their surroundings. These allelochemicals can influence the germination, growth, and development of neighboring plant species, often exhibiting inhibitory effects. Consequently, allelopathic plants and their tissues hold potential for weed control applications. Some allelopathic plants have demonstrated effective weed suppression when incorporated into soil as additives or when their extracts are applied as foliar sprays. Weed infestation presents a significant challenge to agricultural production. However, no studies to date have investigated the allelopathy of L. tulipifera leaves. The objective of this study was to explore potential applications for L. tulipifera leaf waste derived from logging operations and fallen leaves in urban settings. Specifically, the allelopathic activity of fresh and fallen leaves was examined against weed species V. myuros, E. crus-galli, and L. multiflorum under laboratory conditions, and their allelochemicals were characterized. These weed species are prevalent in temperate climates across North America, Europe, and Asia, with E. crus-galli being a globally common weed. Additionally, the allelopathic effects of fresh and fallen leaf powder were evaluated under greenhouse conditions.”
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