Lub molecular oxygen yaj nyob rau hauv dej yog hu ua yaj oxygen thiab feem ntau yog cim raws li D0. Tus nqi ntawm cov pa oxygen yaj hauv dej saum npoo yog 5-10mg / L. Thaum muaj cua txias thiab nthwv dej, cov pa yaj hauv dej tuaj yeem ncav cuag 14mg / L. Dissolved oxygen saturation = dissolved oxygen Measured value/Saturation content of dissolved oxygen in measured conditions * 100%, uas yog hais, 90% thiab siab dua, ntsuas tus nqi siab tshaj 7.5mg / L, thiab qhov tsawg kawg nkaus yog 2mg / L.
Cov dej tsis tshua muaj oxygen yuav nkag mus rau hauv cov nroj tsuag thiab tshem tawm cov pa oxygen los ntawm cov hauv paus system, thiab zoo ib yam, nws yuav deplete cov pa hauv av. Ob qho tib si cov nroj tsuag noj qab haus huv thiab cov av noj qab haus huv xav tau cov pa oxygen hauv ob qhov chaw.
Qhov tsis muaj cov pa oxygen hauv dej tuaj yeem ua rau lwm yam teeb meem. Piv txwv li, nematodes zoo li anoxic av. Irrigating nroj tsuag nrog dej tsawg-oxygen yuav ua rau lawv mus ze ntawm qhov chaw thiab yooj yim ua rau cov hauv paus hniav ntawm cov nroj tsuag.
Cov kev tshawb fawb tau pom tias txo cov concentration ntawm cov pa oxygen hauv cov hauv paus ib puag ncig ntawm cov nroj tsuag yuav txo tau lub peev xwm ntawm cov nroj tsuag kom nqus nitrogen thiab dej. Tsis muaj oxygen tuaj yeem ua mob rau cov hauv paus hniav. Thaum lub sij hawm ntawm adaptation mus rau tsawg concentration ntawm yaj oxygen, cov nroj tsuag cov metabolism hloov. Qhov tsis muaj oxygen hauv cov nroj tsuag hu ua internal hypoxia. Ib qho ntawm qhov tshwm sim yog tias sucrose degrades, thiab cov nroj tsuag txav mus rau txoj kev txuag hluav taws xob los them rau qhov tsis muaj oxygen.
Lub photosynthesis ntawm phytoplankton yog thawj qhov chaw ntawm cov pa oxygen hauv lub pas dej, feem ntau suav txog 56% -80% ntawm cov pa oxygen; tus so yog los ntawm cov cua tshuab tsis muaj pa kom cov pa oxygen nyob rau hauv cov huab cua ncaj qha yaj mus rau hauv dej. Advantageous 12-14mg / L
Heilongjiang: Ib cheeb tsam ntawm 600 square meters ntawm lub pas dej ua ke yuav txhim kho cov dej kub ntawm 3 txog 4 degrees thiab nce qoob loo ntau ntxiv los ntawm 6%.