Sakamakon kasa ya nuna cewa rufe bishiyoyi a biranen Amurka yana raguwa da kusan bishiyoyi miliyan 4 a kowace shekara, a cewar wani binciken dajin daji na Amurka da aka buga kwanan nan a Urban Forestry & Urban Greening.
Rufin bishiyar a cikin birane 17 daga cikin 20 da aka bincika a cikin binciken ya ƙi yayin da biranen 16 suka ga karuwa a cikin murfin da ba zai iya jurewa ba, wanda ya haɗa da pavement da saman rufin. Ƙasar da bishiyoyi suka ɓace galibi an canza su zuwa ko dai ciyawa ko murfin ƙasa, murfin da ba ya da kyau ko ƙasa mara kyau.
Daga cikin biranen 20 da aka bincika, mafi girman yawan asarar shekara a cikin murfin bishiyar ya faru a New Orleans, Houston da Albuquerque. Masu bincike sun yi tsammanin samun asarar bishiyu mai ban mamaki a New Orleans kuma sun ce ya fi dacewa saboda lalacewar Hurricane Katrina a 2005. Tsarin bishiyar ya kasance daga babban 53.9 bisa dari a Atlanta zuwa ƙananan 9.6 bisa dari a Denver yayin da jimlar murfin da ba ta da kyau ya bambanta daga kashi 61.1 a birnin New York zuwa kashi 17.7 a Nashville. Biranen da ke da mafi girman haɓakar shekara-shekara a cikin murfin da ba a iya jurewa sune Los Angeles, Houston da Albuquerque.
"Dazuzzukanmu na birane suna cikin damuwa, kuma zai dauki dukkanmu mu yi aiki tare don inganta lafiyar wadannan wurare masu muhimmanci," in ji shugaban hukumar gandun daji ta Amurka Tom Tidwell. “Kungiyoyin al’umma da masu tsara tsare-tsare na birni za su iya amfani da i-Tree don tantance murfin bishiyar su, da kuma tantance mafi kyawun nau’in da kuma wuraren dasa shuki a yankunansu. Bai yi latti ba don dawo da dazuzzukan biranenmu – lokaci ya yi da za a juya wannan abu.”
Fa'idodin da aka samu daga bishiyoyin birni suna ba da dawowa sau uku fiye da farashin kula da bishiyar, kusan dala 2,500 a cikin ayyukan muhalli kamar rage farashin dumama da sanyaya lokacin rayuwar bishiyar.
Masu binciken gandun daji David Nowak da Eric Greenfield na Cibiyar Bincike ta Arewa ta Sashen Daji na Amurka sun yi amfani da hotunan tauraron dan adam don gano cewa murfin bishiyar yana raguwa da kusan kashi 0.27 na fili a kowace shekara a cikin biranen Amurka, wanda yayi daidai da kashi 0.9 cikin XNUMX na murfin bishiyar da ake samu a duk shekara.
Fassarar hoto na hotunan dijital guda biyu yana ba da hanya mai sauƙi, sauri da sauƙi don tantance canje-canje a cikin nau'ikan murfin daban-daban. Don taimakawa wajen ƙididdige nau'ikan murfin a cikin yanki, kayan aiki kyauta, i-Tree Canopy, yana ba masu amfani damar yin hoto-fassara birni ta amfani da hotunan Google.
"Bishiyoyi wani muhimmin bangare ne na shimfidar birane," in ji Michael T. Rains, Daraktan Cibiyar Bincike ta Arewa. “Suna taka rawa wajen inganta iskar da ruwa da samar da fa’idojin muhalli da zamantakewa da dama. Kamar yadda babban jami'in kula da gandun daji ya ce, '...Bishiyoyin birni sune bishiyar da ta fi aiki tuƙuru a Amurka.' Wannan bincike yana da matukar amfani ga garuruwa masu girma dabam a fadin kasar."
Nowak da Greenfield sun kammala nazari guda biyu, ɗaya na birane 20 da aka zaɓa da kuma wani don yankunan birane na ƙasa, ta hanyar kimanta bambance-bambance tsakanin hotuna na dijital na baya-bayan nan mai yuwuwa da kuma hotuna masu alaƙa kamar kusan shekaru biyar kafin wannan kwanan wata. Hanyoyi sun yi daidai amma kwanakin hoto da nau'ikan sun bambanta tsakanin nazarin biyun.
"Rashin murfin bishiya zai fi girma idan ba don ƙoƙarin dashen itatuwan da biranen suka yi a cikin shekaru da yawa da suka gabata," a cewar Nowak. "Kamfen ɗin dashen bishiya yana taimakawa wajen haɓaka, ko aƙalla rage asarar, rufe bishiyar bishiyar, amma juyar da yanayin na iya buƙatar ƙarin tartsatsi, cikakkun shirye-shirye da haɗaɗɗun shirye-shirye waɗanda ke mai da hankali kan ci gaba da ɗaukar bishiyar gabaɗaya."