發(fā)布時(shí)間：2018-03-22 10:23

  本文選題：生物質(zhì)炭　切入點(diǎn)：腐殖物質(zhì)　出處：《環(huán)境科學(xué)》2017年02期 　論文類型：期刊論文

【摘要】：添加生物質(zhì)炭在增加土壤固碳的同時(shí),對(duì)土壤腐殖物質(zhì)組成及性質(zhì)的影響是人們關(guān)注的問(wèn)題.通過(guò)室內(nèi)培養(yǎng)試驗(yàn)對(duì)土壤腐殖物質(zhì)進(jìn)行提取和分離,利用分光光度計(jì)測(cè)定了土壤胡敏酸(HA)及富里酸(FA)的光學(xué)性質(zhì),研究了不同熱解溫度及施用量下生物質(zhì)炭對(duì)土壤腐殖物質(zhì)組成及結(jié)構(gòu)的影響.結(jié)果表明:生物質(zhì)炭中的類腐殖酸(LHS)含量隨熱解溫度升高逐漸降低,但其結(jié)構(gòu)趨向復(fù)雜化.與對(duì)照相比,低溫(≤400℃)制備的生物質(zhì)炭在培養(yǎng)期間增加了土壤HA含量,并隨著添加比例的增加而增加,培養(yǎng)360 d后,BC300和BC400處理平均分別增加了69.93%和48.75%,且差異達(dá)到顯著水平(P0.05);FA含量在培養(yǎng)前期(240 d)也有所增加,但后期減少了土壤FA含量,培養(yǎng)360 d后,BC300和BC400處理平均分別減少了1.35%和5.19%,但差異并不顯著(P0.05);高溫(400℃)制備的生物質(zhì)炭在培養(yǎng)過(guò)程中主要降低了土壤HA和FA含量(僅在培養(yǎng)初期階段引起土壤HA、FA含量的短時(shí)間增加),至培養(yǎng)結(jié)束時(shí),BC500處理平均分別減少了34.38%和44.48%,BC600處理平均分別減少了42.84%和49.27%,且差異均達(dá)到顯著水平(P0.05).生物質(zhì)炭輸入顯著增加了土壤胡敏素(Hu)的含量,其中以BC500處理的增加效應(yīng)最大.生物質(zhì)炭輸入增加了土壤H/F比,提高了土壤Hu的相對(duì)含量,增加了土壤中相對(duì)穩(wěn)定性碳的比例.高溫制備(400℃)的生物質(zhì)炭培養(yǎng)結(jié)束時(shí)顯著降低了土壤HA及FA的色調(diào)系數(shù)(Δlg K)和E4/E6值,使土壤腐殖物質(zhì)的結(jié)構(gòu)復(fù)雜化,而低溫制備的則相反.從提升有機(jī)碳的穩(wěn)定性考慮,在黃土高原X土地區(qū),在500℃條件下制備生物質(zhì)炭,既能保證最大程度的增加土壤穩(wěn)定性有機(jī)碳庫(kù),又提高了土壤腐殖化程度,從而提高土壤質(zhì)量.
[Abstract]:The effects of biomass carbon on the composition and properties of humic substances in soil are concerned by adding biomass carbon, and the humic substances in soil are extracted and separated by indoor culture experiments. The optical properties of soil Hu Min acid (HA) and fulvic acid (FA) were determined by spectrophotometer. The effects of biomass carbon on the composition and structure of soil humic substances at different pyrolysis temperatures and application rates were studied. The results showed that the content of humic acid like humic acid (LHS) in biomass carbon decreased with the increase of pyrolysis temperature. Compared with the control, the biomass carbon prepared at low temperature (鈮，

本文編號(hào)：1648234