{"title":"Volume function for the tree farming English oak plantations of the Valdarno (Tuscany, Italy)","authors":"M. Marchi, S. Ravagni, F. Pelleri","doi":"10.12899/ASR-1079","DOIUrl":null,"url":null,"abstract":"In the past centuries a notable reduction of lowland forest s in Italy was detected as a result of the spreading of intensive agriculture and deforestation activities . According to the national forest inventory (IN F C 2005 ) the English oak ( Quercus robur L.) is mainly a scattered species and is distributed across 146,000 hectares of mixed forests. However th is species has often been used in many national programs to recreate new woodland s in the lowland s as well as tree farming plantations. In the '80s, d uring the restoration program of the Santa Barbara mining area in the Municipality of Cavriglia ( Valdarno, Tuscany), about 172 hectares of tree farming plantation s were created with English oak . Due to the lack of a specific volume equation for Italian plantations a sampling campaign was carried out. The volume of 299 sample tree s was measured using the Heyer formula and a v olume equation was studied as a polynomial function of DBH and total height of trees . The final equation demonstrated to be quite robust with a RMSE of 0.0176 m 3 corresponding to a relative RMSE of 10%.","PeriodicalId":37733,"journal":{"name":"Annals of Silvicultural Research","volume":"23 1","pages":"104-107"},"PeriodicalIF":0.0000,"publicationDate":"2016-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Annals of Silvicultural Research","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.12899/ASR-1079","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
Abstract
In the past centuries a notable reduction of lowland forest s in Italy was detected as a result of the spreading of intensive agriculture and deforestation activities . According to the national forest inventory (IN F C 2005 ) the English oak ( Quercus robur L.) is mainly a scattered species and is distributed across 146,000 hectares of mixed forests. However th is species has often been used in many national programs to recreate new woodland s in the lowland s as well as tree farming plantations. In the '80s, d uring the restoration program of the Santa Barbara mining area in the Municipality of Cavriglia ( Valdarno, Tuscany), about 172 hectares of tree farming plantation s were created with English oak . Due to the lack of a specific volume equation for Italian plantations a sampling campaign was carried out. The volume of 299 sample tree s was measured using the Heyer formula and a v olume equation was studied as a polynomial function of DBH and total height of trees . The final equation demonstrated to be quite robust with a RMSE of 0.0176 m 3 corresponding to a relative RMSE of 10%.
在过去的几个世纪里,由于集约化农业和森林砍伐活动的蔓延,意大利的低地森林明显减少。根据国家森林资源清查(IN F C 2005),英国橡树(Quercus robur L.)主要是一个分散的物种,分布在14.6万公顷的混交林中。然而,这个物种经常被用于许多国家计划中,在低地重建新的林地,以及植树造林。在80年代,在Cavriglia市(瓦尔达诺,托斯卡纳)的圣巴巴拉矿区的恢复计划中,大约172公顷的树木种植种植园用英国橡木创建。由于意大利种植园缺乏具体的体积方程,因此进行了抽样活动。采用Heyer公式测量了299棵样本树的体积,并研究了以胸径和树高为多项式函数的v体积方程。最后的方程被证明是相当稳健的,RMSE为0.0176 m3,对应于10%的相对RMSE。