Habka Wareegga Nitrogen: Nolosha Dabiiciga ah ee Iswaafajinta
Wareegga nitrogen waa mid ka mid ah wareegyada ugu muhiimsan ee bayolojiga kiimikada ee Dunida, oo ku lug leh dhaqdhaqaaqa nitrojiin ee qaabab kiimiko kala duwan oo u dhexeeya jawiga, ciidda, biyaha, iyo noolaha nool. Nitrojiinku waa curiye muhiim ah, oo sameeya qiyaastii 78% jawiga Dunida qaab gaas nitrojiin ah (N2). Inkasta oo uu badan yahay, qaabkan nitrojiinku si toos ah uma isticmaali karo noolaha nool. Sidaa darteed, wareegga nitrojiinku wuxuu door muhiim ah ka ciyaaraa beddelidda nitrojiinada jawiga qaabab ay isticmaali karaan dhirta iyo xayawaanku. Maqaalkani wuxuu dib u eegi doonaa marxaladaha ugu muhiimsan ee wareegga nitrojiinku.
### 1. Fixinta Nitrogen (Fixinta Nitrogen)
Marxaladda koowaad ee wareegga nitrogen waa hagaajinta nitrogen, habka gaaska nitrogen-ka ee jawiga (N2) loogu beddelo ammonia (NH3) iyada oo loo marayo ficilka noolaha yaryar ama iyada oo loo marayo hababka abiotic-ga sida hillaaca.
Waxaa jira laba nooc oo ugu muhiimsan ee hagaajinta nitrogen:
– Bayooloji Ku-habboon: Waxaa sameeya bakteeriya gaar ah, oo ay ku jiraan kuwa hidde-sidaha Rhizobium, kuwaas oo ku nool xididada xididka ee digirta sida digirta iyo alfalfa. Bakteeriyadani waxay leedahay enzyme nitrogenase, kaas oo jebin kara isku-xidhka xooggan ee u dhexeeya atamka nitrogen ee N2 una rogi kara ammonia.
– Abiotic Fixation: Habkani wuxuu si dabiici ah u dhacaa iyada oo loo marayo hillaac kaas oo bixiya tamar ku filan si uu u jebiyo xiriirka N2 una beddelo atamka nitrogen-ka shaqsiga ah, kaas oo markaa la falgala oksijiinta jawiga si uu u sameeyo nitrite iyo nitrate oo roobku dhulka u qaado.
### 2. Ammonia (Rasaasta)
Ammonifisation, oo sidoo kale loo yaqaan kala-goynta ama macdan-saaridda, waa habka ay walxaha noolaha ee dhintay, ha ahaadaan dhir ama xayawaan, u burburiyaan noolaha saprophytic-ga ah, iyagoo soo saara ammonia (NH3) ama ammonium ions (NH4+). Walxahaan noolaha ah waxaa ka mid ah borotiinno, DNA, iyo isku-dhisyo kale oo nitrogenous ah oo ku jira unugyada nool. Marka noolaha ay dhintaan oo ay kala-go'aan, nitrogen-ka ku jira walaxda noolaha ah ayaa dib loogu soo celiyaa ciidda iyadoo ah ammonia, taas oo dhirtu dib u isticmaali karto.
### 3. Nitrification
Nitrification waa hab laba marxaladood ah oo ammonia (NH3) ama ammonium ions (NH4+) u beddela nitrite (NO2-) ka dibna nitrate (NO3-). Habkan waxaa sameeya bakteeriyada nitrifying:
– Marxaladda koowaad: Oxidation-ka ammonia ilaa nitrite iyadoo la adeegsanayo bakteeriyada loo yaqaan Nitrosomonas.
– NH3 + O2 → NO2- + H2O + H+
– Marxaladda labaad: Oxidation dheeraad ah oo nitrite-ka loo beddelo nitrate-ka iyadoo la adeegsanayo bakteeriyo kala duwan, sida Nitrobacter.
– NO2- + 1/2 O2 → NO3-
Nitrate-ka ka dhasha waxaa nuugi kara xididdada dhirta oo ah nafaqo muhiim ah ama dib loogu celin karaa gaaska nitrogen-ka bilaashka ah, iyadoo ku xiran xaaladaha deegaanka.
### 4. Is-dhexgal
Isku-darka waa habka ay dhirtu uga nuugto nitrate (NO3-) ama ammonium (NH4+) ciidda iyada oo loo marayo xididdadooda. Nitrate-ka la nuugo waxaa loo beddelaa ammonia iyadoo la adeegsanayo enzyme nitrate reductase ee unugyada dhirta. Ammonia-gan waxaa markaa loo isticmaalaa in lagu sameeyo amino acids, nucleotides, iyo isku-dhisyo kale oo nitrogenous ah oo lagama maarmaan u ah koritaanka iyo horumarka dhirta. Habkani wuxuu sidoo kale bixiyaa ilo nitrogen oo muhiim ah xayawaanka quudiya dhirtan, isagoo sii dheereynaya socodka nitrogen ilaa heerarka trophic ee deegaanka.
### 5. Kala-saarista
Denitrification waa habka nitrate-ka (NO3-) loogu beddelo gaas nitrogen (N2) ama gaaska nitrous oxide (N2O) iyada oo loo marayo taxane falcelin anaerobic ah oo ay sameeyaan bakteeriyada denitrifying, sida Pseudomonas iyo Clostridium.
– NO3- → NO2- → MAYA → N2O → N2 (g)
Kala-soocidda wasakhdu waxay inta badan dhacdaa marka ay jiraan xaalado aan anaerobic ahayn, sida carrada biyaha ku badan ama tuulmooyin qashin dabiici ah. Habkani waa muhiim sababtoo ah wuxuu ka caawiyaa ka hortagga ururinta xad-dhaafka ah ee nitrate-ka ee nidaamyada deegaanka, taasoo horseedi karta in biyaha ay ka baxaan.
### 6. Doorka Aadanuhu ku leeyahay Wareegga Nitrogen-ka
Hawlaha aadanuhu waxay saameyn weyn ku leeyihiin wareegga nitrogen-ka dabiiciga ah. Isticmaalka bacriminta nitrogen-ka ee macmal ah ee beeraha waxay gacan ka geysataa kordhinta isku-xidhka nitrogen-ka, laakiin sidoo kale waxay gacan ka geysataa wasakhowga deegaanka iyada oo loo marayo biyo-mareenka oo sababi kara eutrophication ee biyaha. Gubashada shidaalka fosil-ka iyo hawlaha warshadaha ayaa sidoo kale soo saara nitrogen oksaydh, kuwaas oo gacan ka geysta wasakhowga hawada, roobka aashitada, iyo isbeddelka cimilada.
### Gunaanad
Wareegga nitrogen waa tusaale qumman oo muujinaya sida walxaha muhiimka ah ay ugu gudbaan nidaamyada deegaanka dabiiciga ah, iyagoo hubinaya dheelitirka u oggolaanaya noloshu inay barwaaqowdo. Laga bilaabo hagaajinta nitrogen, ammonification, nitrification, isku-darka, iyo denitrification, marxalad kasta waxay ciyaartaa door isku xiran oo muhiim ah. Fahmidda iyo qaddarinta kakanaanta wareegga nitrogen ma aha oo kaliya muhiim u ah cilmiga deegaanka laakiin sidoo kale dadaalkayaga aan ku maareynayno kheyraadka dabiiciga ah iyo deegaanka si waara. Iyadoo la ogyahay wareeggan, waxaan qaadi karnaa tallaabooyin lagu yareynayo saameynta xun ee hawlaha aadanaha iyo ilaalinta dheelitirka dabiiciga ah ee nidaamyada deegaanka.
