![\"IMG_20160404_115126_p\"](\"http:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2016\/04\/IMG_20160404_115126_p.jpg\")
<\/a>En primer lloc determinem una parcel\u00b7la d’estudi d’uns 400 m2.\nLa biomassa dels arbres la limitem nom\u00e9s als troncs. Per tal de calcular-la ens basem en l’equaci\u00f3 de la densitat (D=M\/V); si coneixem la densitat de la fusta de pi (aprox. 0,63 g\/cm3), nom\u00e9s ens cal saber el volum dels troncs; donada la forma c\u00f2nica dels arbres utilitzarem l’equaci\u00f3 del volum del con: V=1\/3*\u03c0 r2*h. El radi de l’arbre l’obtenim amb la cinta diam\u00e8trica i l’al\u00e7ada per mitjans trigonom\u00e8trics amb l’ajut d’un clin\u00f2metre (us podeu baixar al vostre tel\u00e8fon m\u00f2bil aplicacions gratu\u00eftes amb funcions de clin\u00f2metre -“clinometer”- o fins i tot amb c\u00e0lcul directe de l’al\u00e7ada dels arbres: “baumhoehenmesser”).<\/p>\n
Per con\u00e8ixer la producci\u00f3 ens cal saber la biomassa que tenia el bosc fa un cert per\u00edode de temps (5 anys, per exemple) i comparar-la amb l’actual. Per a calcular-la, doncs, necessitem con\u00e8ixer l’al\u00e7ada i el di\u00e0metre dels arbres 5 anys enrere. Ho resolem per m\u00e8todes indirectes, amb l’obtenci\u00f3 de l’edat dels arbres mitjan\u00e7ant els anells de creixement i estimacions de di\u00e0metres i al\u00e7ades.<\/p>\n
El tractament de dades (els resultats de les quals a vegades surten inesperats) es fa amb un full de c\u00e0lcul excel creat a prop\u00f2sit.<\/p>\n
Felicitem a les noies i a les professores per la seva implicaci\u00f3 i bona predisposici\u00f3 en el treball.<\/p>\n","protected":false},"excerpt":{"rendered":"
Un \u00a0grup redu\u00eft de noies de batxillerat de l’Institut Gabriela Mistral (Sant Vicen\u00e7 dels Horts) van portar a terme el passat 4 d’abril un treball d’ecologia forestal amb la finalitat de caracteritzar l’estat actual d’un bosc de pi blanc i fer propostes adequades de gesti\u00f3. Els elements que ens definiran l’estat del bosc seran: – […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[262,265],"tags":[],"class_list":["post-3846","post","type-post","status-publish","format-standard","hentry","category-activitats","category-visites"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/posts\/3846","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/comments?post=3846"}],"version-history":[{"count":0,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/posts\/3846\/revisions"}],"wp:attachment":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/media?parent=3846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/categories?post=3846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-json\/wp\/v2\/tags?post=3846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}