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MODERN BIOGEOCHEMISTRY: SECOND EDITION Phần

Tham khảo tài liệu 'modern biogeochemistry: second edition phần', khoa học tự nhiên, công nghệ môi trường phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | SEMI-ARID AND ARID CLIMATIC ZONES 171 Figure 1. Annual dust emission rates in China ton ha yr . Province Northwestern China Karakum and Kyzylkum deserts Central Asian areas of Kazakhstan Uzbekistan and Turkmenistan . The Gobi desert is the second largest desert in theWorld. Theclimteisexttemelydryandwiiidy. Thestrongestwinds occur during thewsnteranhepsingperiyd.Thesefactors influenceihedeflarionoa soil surThCh layers whtch aroih i Tgth ii.ci byhwarsg veggtation Tpfofihlydurihc the sprinc thntiten r the tOewidgtrozen eppeh eotl hosizon. Theanmiyt guht gmissiooratesdhr the wOoleChina eeg tiarc rhowntn Frehte l- We can eee thet dugtotomt hgfocts odoaidityend roil foxiaae the dust emission rates increosh fsemeaatro were on ísís muod hh Ohadert.ThemgxiFcm omĩssioh rate is 1.5 to Ugmr. nthtoThdusternihuiou emuudtof thnGobl desert is hhttmeliht as 25 X SFC teuspeh fdot ahg Oi ot iospring gr tTulgC Ooaspgryohi. Wteewywnht dust eimssien amoalntsinsumFoa autumnanC wintgtoret.4 oh n n.7xh06ahd 2.9 X 106 tons correanoeFmgiu. DurtyeahrierreaespTatytion nywinTihe durt Terttcteoarednrtohed is heauy meta 1 and other psilheanttpecios espeetetlyduring transport over east and southeast industrial areas of Cnhlg.Fslrlhee eo goOweS denasffionreads ta FcmonenUecosystem exposureto oliih leOliyim eeFaholotedhlcagaay eeetlvmeemeohFrisk. The low rates of aqueous migration of many chemical species in Arid ecosystems and the accumulation of their water-soluble and dispersed forms in the uppermost soil layers play as imoortiinr oulg iw Oie gwhdtemtsau TSegrosot fasmaeioe rnn nllT haar 172 CHAPTER 8 Table 4. Rainwater total salt conteptaadsalt deposition exposure rates over various natural ecosystems in Eurasia. Ecosystems Tgtal rainwater salt content mg L Total salt deposition rate kg ha yr Forest 17-20 7a-too Steppe 45-50 170-180 Desert 150 210-240 chemistry. In turn biogeochemical processes in soil-plant-air system determine the water chemistry and exposure pathways Table 4 . Despite the .