| 王雨阳,罗春岩,韦增辉,赵庆杰,吴蔚东.生物炭对土壤有机质结合铜库容量大小及组成的调控[J].农业环境科学学报,2019,38(4):855-862. |
| 生物炭对土壤有机质结合铜库容量大小及组成的调控 |
| Effect of biochar on the size and composition of soil-pool capacity(SPC)of copper in organic matter fraction |
| 投稿时间：2018-07-30 |
| DOI：10.11654/jaes.2018-0975 |
| 中文关键词: 有机质 铜 库容组成 生物炭 |
| 英文关键词: organic matter copper composition biochar |
| 基金项目:国家重点基础研究发展计划项目（2017YFD0202101）；国家自然科学基金项目（21866013） |
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| 中文摘要: |
| 为研究生物炭对土壤中有机质组分结合铜库容量的大小与组成的调控能力，选择海南省具有代表性的热带次生林和橡胶林的土壤进行模拟实验，根据其有机质含量低、中、高，分别记为SoilL、SoilM、SoilH，以SoilH的含碳量为标准，向SoilL和SoilM中加入玉米秸秆生物炭（处理土壤分别记为SoilL+B和SoilM+B），并通过添加不同浓度的硝酸铜模拟土壤不同铜污染水平。结果表明：SoilL+B和SoilM+B的有机质结合态铜饱和容量分别为8.70 mg·g-1和9.76 mg·g-1，分别为SoilL和SoilM的3.69倍和3.12倍；SoilL+B较SoilL的富啡酸结合态铜（FA-Cu）、胡敏酸结合态铜（HA-Cu）、球囊霉素结合态铜（GRSP-Cu）和颗粒有机碳结合态铜（POM-Cu）的饱和容量分别增加了1.71、2.83、2.75 mg·g-1和0.09 mg·g-1，而黑炭结合态铜（BC-Cu）的饱和容量降低了0.76 mg·g-1；SoilM+B较SoilM的FA-Cu、HA-Cu、GRSP-Cu和POM-Cu的饱和容量分别增加了1.66、3.75、2.68 mg·g-1和0.07 mg·g-1，但BC-Cu的饱和容量降低了2.14 mg·g-1；生物炭对SoilL和SoilM中5种有机组分结合态铜库贡献的大小顺序均为HA > GRSP > FA > POM > BC。研究表明，添加生物炭可以显著提高土壤有机质结合铜库和各有机组分铜库的容量，并提高土壤对重金属的缓冲能力。 |
| 英文摘要: |
| To investigate the regulation capability of exogenous biochar on the size and composition of the soil-pool capacity for Cu in soil organic matter, representative soils from the tropical secondary rainforest and rubber plantations in Hainan Province were selected for further study. Per their soil organic carbon (OC) contents, we separated the soils into SoilL (low OC), SoilM (medium OC), and SoilH (high OC). Tested soils (SoilL and SoilM) were amended with corn-straw biochar (SoilL+B and SoilM+B). We spiked the soil samples with different levels of Cu (NO3)2, forming different Cu-contaminated treatments. Results showed that the saturation capacity of organic matterbound Cu was 8.70 mg·g-1 and 9.76 mg·g-1 in SoilL+B and SiolM+B, respectively, equivalent to 3.69 times and 3.12 times that of corresponding SoilL and SoilM. Compared to SoilL the saturation capacity of FA (fulvic acid) -Cu, HA (humic acid) -Cu, GRSP (glomalin-related soil protein) -Cu, and POM (particulate organic matter) -Cu in SoilL+B increased by 1.71, 2.83, 2.75 mg·g-1, and 0.09 mg·g-1, respectively. The saturation capacity of BC-Cu decreased by 0.76 mg·g-1 in SoilL+B. Compared to SoilM, the saturation capacity of FA-Cu, HA-Cu, GRSP-Cu, and POM-Cu in SoilM+B increased by 1.66, 3.75, 2.68 mg·g-1, and 0.07 mg·g-1, respectively, whereas the saturation capacity of BC-Cu reduced by 2.14 mg·g-1 in SoilM+B. The contribution rates of amended biochar to five organic-matter component-bound Cu pools in both SoilL and SoilM followed this order:HA > GRSP > FA > POM > BC. Thus, biochar significantly increases soil-pool capacity of Cu bound on organic matters and different organic-matter components in the soil. This is of great significance in improving the buffering capacity of soil for heavy metals. |
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