Ana samun gandun daji masu yankewa a Gabashin Asiya da Turai, Arewacin Amurka, New Zealand da Chile. Gida ne na bishiyun bishiyoyi tare da faranti masu fadi iri-iri. Waɗannan su ne tsattsauran ra'ayi da maple, bishiyoyi da lindens, toka da kudan zuma. Suna girma a cikin yanayi mai yanayi wanda yake da yanayin sanyin hunturu da rani mai tsayi.
Matsalar amfani da albarkatun daji
Babbar matsalar muhalli ta gandun daji itace yanke bishiyoyi. Wani nau'in mahimmanci mai mahimmanci shine itacen oak, wanda ake amfani dashi don samar da kayan ɗaki da kayan gida. Tunda an yi amfani da wannan itacen don ƙarni da yawa, jeren wannan nau'in yana raguwa koyaushe. Ana amfani da nau'ikan daban-daban don ginawa da dumama gidajen, don masana'antun sunadarai da takarda, kuma ana amfani da 'ya'yan itace da namomin kaza azaman abinci.
Ana yin sarewar daji don yantar da yankin don ƙasar noma. Yanzu murfin gandun daji yayi kasa, kuma galibi zaka iya samun canjin gandun daji da filin. Hakanan an sare bishiyoyi don amfani da yankin don aikace-aikacen hanyoyin jirgin ƙasa da manyan hanyoyi, faɗaɗa kan iyakokin ƙauyuka da gina gidaje.
Hanyar sakamakon haka an sare dazuzzuka kuma yantar da ƙasa daga bishiyoyi don ci gaban tattalin arziƙin ana kiransa sare bishiyoyi, wanda shine matsalar muhalli ta gaggawa a wannan zamanin. Abin baƙin cikin shine, saurin wannan aikin shine 1.4 miliyan kV. kilomita a cikin shekaru 10.
Matsalolin farko
Canje-canje a cikin dazuzzuka masu canjin yanayi yana shafar sauyin yanayi da canjin yanayi. Tunda yanzu duniya tana fuskantar dumamar yanayi, wannan ba zai iya shafar yanayin yanayin halittar gandun daji ba. Tunda yanayi ya gurɓace yanzu, yana cutar da itacen daji. Lokacin da abubuwa masu cutarwa suka shiga cikin iska, sai su faɗi a cikin yanayin ruwan sama na acid kuma su munana yanayin tsire-tsire: hotunan photosynthesis yana rikicewa kuma haɓakar bishiyoyi suna raguwa. Yawan ruwan sama, mai cike da sinadarai, na iya kashe dajin.
Gobarar daji babbar barazana ce ga dazuzzuka. Suna faruwa ne saboda dalilai na halitta a lokacin bazara, lokacin da yanayin zafin iska ya zama mai tsananin gaske, kuma hazo baya faduwa, kuma saboda tasirin anthropogenic, lokacin da mutane basu kashe wutar a kan lokaci ba.
An jera manyan matsalolin muhalli na dazuzzuka masu dazuzzuka, amma akwai wasu, kamar su farauta da gurbatar sharar, da kuma wasu da dama.
