1,721,090 research outputs found
Alcune considerazioni sugli interventi eseguiti sulla vegetazione litoranea di Livorno
No full textLa vegetazione (alberi ed arbusti) in città assume molteplici funzioni (paesaggistica, ornamentale, igienico-sanitaria, ecologica, ecc.) che possono essere cancellate anche per un lungo periodo con interventi troppo drastici (capitozzature, potatura estrema). Il caso degli interventi eseguiti su tamerici, pittospori e palme nane della passeggiata litoranea di Livorno ne rappresenta un esempio. Si forniscono pertanto alcune considerazioni, supportate anche dalla bibliografia scientifica, che devono far riflettere sull'opportunità o meno di eseguire tali interventi, nonostante che oggi la sicurezza e il decoro urbano abbiano spesso la precedenza su aspetti meno appariscenti, ma di sicuro fondamentali per la qualità della vita in città
L’albero in città e l’impiego delle specie da frutto per la costruzione del verde urbano
No full textLineaverd
Physiological Responses of Clonal Quince Rootstocks to Iron-Deficiency Induced by Addition of Bicarbonate to Nutrient Solution
No full textL’impianto dei grandi alberi: alcuni aspetti tecnici d’interesse per la pianta e per il progettista
No full textCRITERI DI SCELTA DELLA SPECIE ARBOREA IN AMBITO URBANO: UN CASO DI STUDIO SULLA COSTA TIRRENICA (VIA GARIBALDI - LIDO DI CAMAIORE)
No full textThe right choice of the species is one of the main planning criteria that influences the future of tree planting and characterises its management. In this paper a retraining proposal of a street of Lido di Camaiore (LU) is described within the collaboration between University of Pisa and Municipality of Camaiore. Garibaldi street is one of the central streets of the town, parallel to the sea (N-S) and a law (n. 431/85) binds it. At present the plantation is constituted by Acer negundo L. species, exactly 179 trees located on two row and planted 40 years ago. Already in the seventies they suffered the first important stress when works on street sewerage were done. Then they have suffered pollarding so visual tree assessment (VTA) method applied on 30 trees showed bad growth and hazardous phytostatic conditions. Also new plantations with Sycamore presented a scarce adaptability. A botanical analysis into neighbouring streets (Acer pseudoplatanus L., Robinia pseudoacacia L., Celtis aus..
Prove preliminari sulla tolleranza alla clorosi calcarea di nuovi portinnesti ibridi pesco x mandorlo
No full textLime-induced chlorosis is a limiting factor of peach cultivation when peach seedling rootstocks are utilized. At present the problem seems to be solved with the most used rootstock by fruit-growers, the hybrid ‘GF 677’, joining good agronomic and quality characteristics, but inducing high vigour. Consequently the selection of other hybrid rootstocks seems essential, as alternative to ‘GF 677’, suitable for medium-high density planting and tolerant to calcareous soil. The aim of this research was to evaluate the tolerance to lime induced chlorosis by hydroponic culture of three clonal hybrid rootstocks, ‘Polluce’ (I.S. 5/8), ‘Castore’( I.S. 5/19) and I.S. 5/29, in comparison to ‘GF 677’. During a month of culture in nutrient solution (Hoagland n°1) supplemented with 0.0 and 10.0 mM of sodium bicarbonate, vegetative and physiological responses were detected. The NaHCO3 treatment reduced absolute and ponderate weight increment and total chlorophyll in every clones, but the most vigorou..
Iron deficiency in plum rootstocks: effects on leaf chlorophyll content and mineral composition
No full textMicropropagated one-year old plants of ten clonal plum rootstocks (eight of the ‘S. Julien’ hybrid series, named I.S.G., and two of the myrobalan series, named Mr.S.) were grown in a modified Hoagland nutrient solution supplemented or not with 10 mM NaHCO3 plus 0.5 mg L-1 CaCO3. Trials were repeated for two years: during the culture month in greenhouse iron deficiency occurred and rootstocks showed different symptomatology. In Fe deficient leaves the total chlorophyll content (mg g-1 F.W.), decreased from 30% to 60% respect to control plants; the same trend was observed when the content was expressed as milligrams per square centimetres, but with a higher decrement, due to different susceptibility of rootstocks and leaf thickness. Chlorophyll content correlated strictly with visual appearance. A general increment of Chl a/ Chl b ratio was showed in stress conditions, except from ‘Mr.S.2/8’, ‘I.S.G.1/2’, ‘I.S.G.1/4’, ‘I.S.G.1/6’ and ‘I.S.G.2/10’ clones. Fe2+ iron content was analysed in leaves and roots by Ferrozine® chelate. Results showed that the control conditions determined uniform contents, while bicarbonate influenced them in different way. The leaf mineral content changed relative to treatments, nutrient type and clone susceptibility. Generally N and P macronutrient content decreased in all rootstocks under iron deficiency, while K content increased in some of them. As already remarked in other species, calcium content decreased in the chlorotic leaves and they presented a high K/Ca ratio, but without statistically significant differences. Other mineral content ratios were discussed. Iron, manganese and zinc contents were significantly lower in the yellow leaves, even if the most tolerant plum rootstocks showed similar or, however, high contents
Participatory planning of a urban tree-lined: the case of study of Calcinaia (Pisa)
No full textCalcinaia is a small town in the province of Pisa (Tuscany - Italy). The main entrances to the town consist of two avenues with Italian stone pine (Pinus pinea L.). This species is known to cause damage to the roadway due to numerous surface roots and makes it so dangerous; therefore stone pine shows asymptomatic sudden fall of branches ( due to torsion of branches, to wind or snow load, summer heat ) or of whole plants. After an accident (fall of one of the pine trees), which fortunately did not result in casualties , the city administration decided to give appointment at the University to conduct a study on the propensity to failure of Matteotti avenue pines and to evaluate the possibility of replacing all the pines with other species. After evaluation with methodology VTA and application of pulling test , the 130 pines resulted healthy but with poor anchorage of the roots due to plant age (90 years old) and rooting conditions (steep escarpment and asphalt, restored several times with radical cuts ). The study was conducted to determine all the possible constraints to envisage citizenship and was subsequently initiated a process of participatory planning. Two meetings with citizens, eager to participate and contribute to the ultimate objective, were enough to explain to them the reasons of pine cutting and to find two solutions to reduce the impact and maintenance: 1) retrain the avenue with plane trees or 2) with oaks and linden trees , alternating them on each row. The solutions were both valid and the citizens voted preferring the former. Within a few months the project has been drawn up with the new solutions and in November 2013 was carried out . The success of participatory planning was evident because citizenship is now satisfied with the result and waits anxiously to see grow new plants, with the knowledge that everyone has personally contributed to the goal
IL PARCO DI VILLA TORRIGIANI (CAMIGLIANO – LU): APPLICAZIONE DEL VTA PER LA GESTIONE DEGLI ESEMPLARI ARBOREI E PER LA SICUREZZA DEI FRUITORI
No full text- …
