本文選題：碳匯　切入點(diǎn)：化學(xué)風(fēng)化　出處：《環(huán)境科學(xué)》2016年12期

【摘要】：巖石風(fēng)化產(chǎn)生的碳匯是全球碳循環(huán)的重要組成部分,文中對(duì)清水江流域主要離子組成進(jìn)行分析測定,通過主成分分析、化學(xué)物質(zhì)平衡法和扣除法估算流域巖石風(fēng)化速率及對(duì)大氣CO_2的消耗量.結(jié)果表明,流域河水溶質(zhì)主要來源于碳酸鹽巖和硅酸鹽巖風(fēng)化,并以碳酸鹽巖風(fēng)化為主.碳酸鹽、硅酸鹽、大氣CO_2對(duì)河水溶質(zhì)的貢獻(xiàn)率分別為58.28%、17.38%、17.74%.流域巖石化學(xué)風(fēng)化速率為109.97 t·(km~2·a)~(-1),與烏江接近,高于全球流域均值.流域巖石風(fēng)化對(duì)大氣CO_2的消耗通量為7.25×10~5mol·(km~2·a)~(-1),巖石風(fēng)化對(duì)大氣CO_2的消耗量為12.45×10~9mol·a~(-1),其中,碳酸鹽巖風(fēng)化消耗量占63.13%,為7.86×10~9mol·a~(-1),硅酸鹽巖風(fēng)化消耗量占36.87%,為4.59×10~9mol·a~(-1).SO_4~(2-)、F~-、NO_3~-的相關(guān)分析及空間分布特征表明,人為活動(dòng)對(duì)清水江流域河水溶質(zhì)的影響不容忽視,其貢獻(xiàn)率為4.87%.
[Abstract]:The carbon sink produced by rock weathering is an important part of the global carbon cycle. The chemical balance method and deduction method are used to estimate the weathering rate of rocks and the consumption of atmospheric CO_2 in the basin. The results show that the solute of river water mainly comes from the weathering of carbonate rock and silicate rock, and mainly from carbonate rock weathering. The contribution rates of silicate and atmospheric CO_2 to the solute of river water are 58.28% and 17.38% and 17.74% respectively. The chemical weathering rate of rocks in the basin is 109.97 t / kg / kg ~ (2) / a ~ (-1) ~ (-1), which is close to Wujiang River. The consumption flux of atmospheric CO_2 by rock weathering in the basin is 7.25 脳 10~5mol / km-1 ~ (-1), and the consumption of atmospheric CO_2 by rock weathering is 12.45 脳 10~9mol ~ (-1) ~ (-1). The weathering consumption of carbonate rock accounts for 63.13, which is 7.86 脳 10~9mol / a ~ (-1), and silicate rock's weathering consumption is 36.87, and the correlation analysis and spatial distribution of the correlation of weathering consumption of carbonate rock and silicate rock are 4.59 脳 10~9mol / a ~ (-1). So ~ (4) ~ (4) ~ (4) ~ (4) ~ (4) ~ (-) ~ (-) ~-and its spatial distribution characteristics show that the influence of human activities on the solute content of river water in Qingshui River basin can not be ignored, and its contribution rate is 4.87 ~ (th).
【作者單位】： 貴州大學(xué)資源與環(huán)境工程學(xué)院;貴州大學(xué)喀斯特環(huán)境與地質(zhì)災(zāi)害防治重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院地球化學(xué)研究所環(huán)境地球化學(xué)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(42603123) 中國博士后科學(xué)基金項(xiàng)目(2014M562388) 水利部公益性行業(yè)科研專項(xiàng)(201401050)
【分類號(hào)】：P512.1;X14

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