EGI OpenIR
脱硫石膏添加在盐碱土改良过程中的碳收益
Alternative TitleCarbon Benefits of Desulfurization Gypsum Addition in the Process of Saline-alkali Soil Improvement
陈园园
Subtype硕士
Thesis Advisor王玉刚
2019-06-30
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Discipline农学硕士
Keyword脱硫石膏 盐碱土改良 土柱模拟 碳含量 淋溶碳 碳收益 Flue Gas Desulphurization Gypsum Saline-alkali Soil Improvement Soil Column Simulation Total Carbon Content Leaching Carbon Carbon Gain
Abstract盐碱土是地球上广泛分布的一种重要的土地资源, 是可溶性盐过多的盐土和含代换性钠较多的碱土的统称。 盐碱土会使土壤板结、 肥力下降, 抑制作物的正常生长, 严重制约生态环境的改善。 脱硫石膏是火电厂在脱硫环节中产生的副产物, 利用其对盐碱土改良的同时, 也影响着作物的生长和土壤碳库的变化。 本研究采取田间施加和室内土柱模拟实验相结合, 以绿洲典型盐土和碱土作为研究对象, 通过添加不同数量脱硫石膏(六个梯度: 0、 10、 20、 21.78(理论量) 、 30、40 t/hm2) , 研究了脱硫石膏在盐碱土改良过程中的碳收益。 主要研究结果如下:(1) 脱硫石膏添加对典型碱土土壤碳的影响:随着脱硫石膏添加量增大, 改良层 0-20 cm, SIC 含量由 5.57 g/kg, 增加到7.76 g/kg; 土壤剖面 0-100 cm, SIC 含量明显增加, 表明脱硫石膏添加促进了无机碳的聚积; 不同土层, 随着土层深度的增加, SIC 含量在减小, 在 80-100 cm土层达最低, 并且, SICD 随脱硫石膏添加量呈现 S 型分布, 在脱硫石膏添加量为 30 t/hm2时达最大。 随脱硫石膏添加量增加, 土壤剖面 SOC 含量变化较小,数值大小为 0.99 -1.41 g/kg, SOCD 值为 0.14-0.23 t/hm2。随土层深度的增加, SOC含量减小, 而 SOCD 值增加(P>0.05) 。 结果表明, 脱硫石膏改良碱土过程,有效促进了 SIC 的聚积, 而对于 SOC 作用不明显。(2) 盐土、 碱土改良中碳聚积:a. 盐土、 碱土土壤碳含量变化特征: 加入脱硫石膏后, 盐土 SIC 含量无明显增加(P>0.05) , 其含量为 6.73-7.53 g/kg, 而碱土, SIC 含量明显增加, 其含量为 4.83-6.57 g/kg; 盐土 SOC 含量, 相比对照组(脱硫石膏添加量为 0) 数值减小了 1.4 g/kg, 数值范围在 3.31-3.67 g/kg, 而碱土 SOC 含量无明显变化(P>0.05) 。 总体上, 土壤碳含量(SOC 或 SIC) , 盐土高于碱土。b. 盐土、 碱土作物地上/地下生物量碳变化特征: 添加脱硫石膏后, 碱土小麦地上、 地下和总生物量碳均显著增大(P<0.05), 地上生物量碳增加了 33.6 %,地下生物量碳增加了 35.8 %, 总生物量增加了 39.0 %。 脱硫石膏的添加降低了盐土小麦的地上生物量碳和总生物量碳(P<0.05) , 地上生物量碳在脱硫石膏添加量为理论量时, 减少数量最大, 达 9.46 t/hm2, 总生物量碳与地上生物量碳变化相似, 减少了 9.34 t/hm2, 而地下生物量碳的减少数量相对较小, 变化量为0.19-0.62 t/hm2。c. 盐土、 碱土土壤淋溶液可溶性无机碳(DIC) 变化特征: 无论碱土还是盐土, 随脱硫石膏添加量增加, 淋溶液 DIC 累积量相比较对照, 先减小后增加(P<0.05) 。 并且, 碱土淋溶液 DIC 累积量无显著差异(P>0.05) , 仅在添加量为 40 t/hm2 时与对照相同; 而盐土淋溶液 DIC 累积量, 在 10 t/hm2 时, 降低了51.4 %, 而当脱硫石膏添加量增加后, 淋溶 DIC 累积量增加。整体随脱硫石膏添加量增大, 碱土碳聚积量增加; 盐土则变化不大(P>0.05) 。 碳聚积量, 土壤>植被>淋溶液。 说明脱硫石膏改良盐碱土过程, 能够促进碱土碳聚积, 且随着脱硫石膏添加量增大, 碱土碳聚积量增大; 而对盐土的碳聚积作用不明显。
Other AbstractSaline-alkali soil is an important land resource that widely distributed on theearth, consisting of saline soil with large amount of soluble salt and alkali soil withsubstitutable sodium. Soil saline-alkalization can cause soil hardening and decliningof soil fertility, thus seriously inhibits the crop growth and restricts the improvementof ecological environment. Flue Gas Desulphurization Gypsum(FGDG) is aby-product during the desulphurization process in thermal power plants, which couldbe used to modify saline-alkali soil. However, crop growth and soil carbon pool couldalso be influenced by FGDG addition. Therefore, the current study combined fieldapplication with indoor soil column simulation experiments to explore the carbon gainof FGDG in the process of saline-alkali soil improvement by adding calcium source tosaline-alkali soils (six gradients: 0、 10、 20、 21.78(the theoretical addition) 、 30、40 t/hm2 ). The main results are as follows:(1) Effects of FGDG on carbon content in typical alkaline soils:With the addition of the FGDG, the soil inorganic carbon (SIC) of the modifiedlayer (0-20 cm) varied from 5.57 g/kg to 7.76 g/kg. The SIC contents at depth of0-100 cm increased obviously, indicating that the addition of FGDG promoted theaccumulation of soil inorganic carbon. With the increase of soil depth, the SICcontents of different soil layers decreased, and reached the lowest at depth of 80-100cm. In addition, the soil inorganic carbon densities (SICD) presented “S” shapedistribution with the increase of the addition of FGDG, and reached the maximumwhen the addition of FGDG was 30 t/hm2. With the addition of FGDG, the soilorganic carbon (SOC) and soil organic carbon densities (SOCD) varied slightly,within the range of 0.99-1.41 g/kg and 0.14-0.23 t/hm2, respectively. With the increaseof soil depth, the SOC contents decreased while the SOCD increased (P>0.05). Theseresults indicate that the process of improving alkaline soil by FGDG had an effectivepromotion on the accumulation of SIC, but not on that of SOC.(2) Soil carbon accumulation in saline soil and alkaline soil improvement:a. The changes of carbon pool in saline and alkaline soil: With the addition ofFGDG, the SIC contents of saline soil did not change significantly (P>0.05), rangedfrom 6.73 to 7.53 g/kg, while those of alkaline soil increased significantly, rangedfrom 4.83 to 6.57 g/kg. Compared to the control group (FGDG content = 0), the SOCcontents of saline soil reduced by 1.4 g/kg, and varied at the range of 3.31-3.67 g/kg,while those of alkaline soil did not change significantly (P>0.05). Overall, the soilcarbon contents (SOC or SIC) of saline soil were higher than those of alkaline soil.b. The changes of above-ground and below-ground biomass carbon in saline andalkaline soil crops: With the addition of FGDG, the above-ground, below-ground andtotal biomass carbon increased significantly (P<0.05) in alkaline soil wheat, with theincreasing percentages of 33.6, 35.8, and 39.0 %, respectively. However, theabove-ground and total biomass carbon of wheat in saline soil decreased with theaddition of FGDG (P<0.05), which reduced the most under the theoretical FGDGaddition, with the decreases of 9.46 t/hm2 and 9.34 t/hm2, respectively. While thereduction in below-ground biomass carbon was relatively less, within the range of0.19-0.62 t/hm2.c. The changes of dissolved inorganic carbon(DIC) in saline and alkaline soilleaching solutions: Compared to the control group, the accumulation of DIC inalkaline and saline soil leaching solutions both exhibited decreasing first and thenincreasing with the addition of FGDG (P<0.05). The accumulation of DIC in alkalinesoil leaching solution did not change significantly (P>0.05), and was the same as thecontrol group when the FGDG addition was 40 t/hm2. However, the accumulation ofDIC in saline soil leaching solution decreased by 51.4 % when the FGDG additionwas 10 t/hm2, and then increased with the increase of the addition of FGDG.Overall, with the addition of FGDG, the carbon accumulation of alkaline soilincreased, while those of saline soil did not change significantly (P>0.05). The orderof the carbon accumulation from most to least was soil, crops, and soil leachingsolutions, respectively. The above results indicate that the process of FGDG additionfor soil improvement could promote the carbon accumulation in alkaline soil, and the accumulation increased with the addition of FGDG, whereas the promotion on carbonaccumulation in saline soil was not obvious.
Subject Area水土保持与荒漠化防治
Language中文
Document Type学位论文
Identifierhttp://ir.xjlas.org/handle/365004/15310
Collection中国科学院新疆生态与地理研究所
研究系统
Affiliation中国科学院新疆生态与地理研究所
First Author Affilication中国科学院新疆生态与地理研究所
Recommended Citation
GB/T 7714
陈园园. 脱硫石膏添加在盐碱土改良过程中的碳收益[D]. 北京. 中国科学院大学,2019.
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