Migumisiro yenyika inoratidza kuti kuvharwa kwemiti munzvimbo dzomumaguta eUnited States kuri kuderera pamwero wemiti inosvika mamiriyoni mana pagore, maererano neongororo yeUS Forest Service yakabudiswa munguva pfupi yapfuura muUrban Forestry & Urban Greening.
Kuvharwa kwemiti mumaguta gumi nemanomwe emakumi maviri akaongororwa muchidzidzo ichi kwakadzikira apo maguta gumi nematanhatu akaona kuwedzera kwechivharo chisingapindire, icho chinosanganisira mugwagwa nedenga remba. Ivhu rakarasika miti kazhinji kazhinji raishandurwa kuva huswa kana chivharo chevhu, chivharo chisingapindi kana ivhu risina chinhu.
Pamaguta makumi maviri akaongororwa, chikamu chikuru chekurasikirwa kwepagore mukuvhara kwemiti kwakaitika muNew Orleans, Houston neAlbuquerque. Vatsvakurudzi vaitarisira kuwana kurasikirwa kunoshamisa kwemiti muNew Orleans uye vakati zvinowanzoitika nekuda kwekuparadzwa kweHurricane Katrina muna 20. Chifukidzo chemuti chakabva kune yakakwirira ye2005 muzana muAtlanta kusvika pasi pe53.9 muzana muDenver nepo chivharo chisingaiti chakasiyana kubva ku9.6 muzana muNew York City. Maguta ane kuwedzera kukuru kwepagore kwevhavha isingapindiki aive Los Angeles, Houston neAlbuquerque.
"Masango edu emumaguta ari kunetseka, uye zvichatora isu tose kushanda pamwe chete kuvandudza hutano hwenzvimbo dzakasvibira idzi," akadaro Mukuru weSango reSango reUS Tom Tidwell. "Masangano emunharaunda uye varongi vemanisiparati vanogona kushandisa i-Tree kuongorora yavo yemiti yakavharwa, uye kuona mhando dzemhando yepamusoro uye nzvimbo dzekudyara munzvimbo dzavanogara. Hazvisati zvanyanya kunonoka kudzoreredza masango edu emudhorobha – nguva yasvika yekuti tishandure izvi.”
Mabhenefiti anobva kumiti yemumaguta anopa kudzoka kwakakura zvakapetwa katatu kupfuura mutengo wekuchengeta miti, inosvika $2,500 mumasevhisi ezvakatipoteredza akadai sekuderedzwa kwekudziya uye kutonhora kwemitengo panguva yehupenyu hwemuti.
Vatsvakurudzi vemasango David Nowak naEric Greenfield veUS Forest Service's Northern Research Station vakashandisa mifananidzo yesatellite kuona kuti kuvharwa kwemiti kuri kudzikira pamwero unosvika 0.27 muzana yenzvimbo yevhu pagore mumaguta eUS, izvo zvakaenzana ne0.9 muzana yemiti yemudhorobha iripo inorasika pagore.
Kududzirwa kwemifananidzo yemifananidzo yakapetwa yedhijitari kunopa nzira iri nyore, inokurumidza uye isingadhuri yekuongorora shanduko pakati pemhando dzakasiyana dzevhavha. Kubatsira mukuenzanisa mhando dzekuvhara mukati menzvimbo, chishandiso chemahara, i-Muti Canopy, inobvumira vashandisi kududzira guta vachishandisa mifananidzo yeGoogle.
"Miti chikamu chakakosha chenzvimbo yemaguta," maererano naMichael T. Rains, Mutungamiriri weNorthern Research Station. “Vanoita basa rekuvandudza kunaka kwemhepo nemvura uye kupa zvakawanda zvakanaka zvakatipoteredza nemagariro. Sekutaura kunoita Mukuru wedu weSango, '…miti yemumaguta ndiyo miti inoshanda zvakanyanya muAmerica.' Tsvagiridzo iyi chishandiso chikuru kumaguta emhando dzakasiyana munyika yose. "
Nowak neGreenfield vakapedza ongororo mbiri, imwe yemaguta makumi maviri akasarudzwa uye imwe yenzvimbo dzemaguta enyika, nekuongorora mutsauko pakati peazvino mafoto emuchadenga edhijitari anogoneka uye mifananidzo yekufambidzana zvakanyanya kusvika makore mashanu zuva risati rasvika. Nzira dzaienderana asi mazuva emifananidzo nemhando dzaisiyana pakati peongororo mbiri idzi.
"Kurasikirwa kwemuti kungadai kwakakwira dai pasina kuedza kwekudyara miti kwakaitwa nemaguta mumakore akati wandei apfuura," sekureva kwaNowak. "Mishandirapamwe yekudyara miti iri kubatsira kuwedzera, kana kudzikisa kurasikirwa kwemuti wemumaguta, asi kudzoreredza maitiro kunogona kuda kupararira, kwakazara uye kwakabatanidzwa zvirongwa zvinotarisa kuchengetedza miti yese."