TU Dan,MAO Tianxu.Effect of Biochar Addition on Saturated Hydraulic Conductivity of Yellow Soil in Karst Area[J].Research of Soil and Water Conservation,2021,28(05):108-113.
添加生物质炭对喀斯特地区黄壤饱和导水率的影响
- Title:
- Effect of Biochar Addition on Saturated Hydraulic Conductivity of Yellow Soil in Karst Area
- 文章编号:
- 1005-3409(2021)05-0108-06
- Keywords:
- biochar; yellow soil; field water holding capacity; capillary water holding capacity; saturated hydraulic conductivity
- 分类号:
- S152.7
- 文献标志码:
- A
- 摘要:
- 为探究添加生物质炭对喀斯特坡耕地黄壤饱和导水率的影响,在室内条件下测定了不同添加量(质量分数为0,1%,2%,3%)、不同粒径(粒径大小为<0.25 mm,0.25～1 mm和>1 mm)的玉米秸秆生物质炭(CSB)和稻壳生物质炭(RHB)添加后的土壤容重、孔隙度、持水量和饱和导水率。结果显示:添加生物质炭显著降低了土壤容重,与对照(CK)相比,添加相同含量的CSB和RHB后土壤容重分别降低了5.13%和4.85%,随着添加量增加,土壤容重呈减小趋势,而土壤总孔隙度和毛管孔隙度呈增大趋势。添加CSB和RHB后土壤的田间持水量(FMC)提高了5.30%和4.72%,毛管持水量(CWC)提高了4.75%和6.60%,随着添加量增加、粒径增大,土壤的FMC和CWC呈增大趋势。土壤饱和导水率的变化与生物质炭的粒径有关,添加<0.25 mm粒径CSB和RHB,土壤饱和导水率减小了11.74%和21.74%,添加>1 mm粒径CSB和RHB,土壤饱和导水率增加了66.67%和33.33%,添加0.25～1 mm粒径的生物质炭,土壤饱和导水率无明显的变化规律。本研究得出,添加生物质炭可以显著降低土壤容重,提高土壤田间持水量和毛管持水量,改善土壤的导水性能,研究结果可为生物质炭在喀斯特地区坡耕地黄壤结构改良的应用中提供理论依据。
- Abstract:
- In order to explore the effect of biochar addition on the saturated hydraulic conductivity of yellow soil in Karst sloping farmland,soil bulk density,porosity,water holding capacity and saturated hydraulic conductivity were determined under the treatments of the corn straw biochar(CSB)and rice husk biochar(RHB)addition with different amounts(0,1%,2%,3%)and different particle sizes(0.25 mm,0.25～1 mm,and> 1 mm). The results showed that the addition of biochar significantly reduces the soil bulk density. Compared with the control(CK),the additions of CSB and RHB reduce the soil bulk density by 5.13% and 4.85%,respectively,the soil bulk density shows the decreasing trend with the increase of the addition,the corresponding total soil porosity and capillary porosity show the increasing trend. The field water holding capacities(FMC)of the soils with CSB and RHB addition increase by 5.30% and 4.72%,and the capillary water holding capacities(CWC)increase by 4.75% and 6.60%,respectively. With the increase of the amount of biochar and the increase in particle size,the FMC and CWC increase. The change of saturated hydraulic conductivity is related to the particle size of biochar. Compared with CK,the saturated hydraulic conductivities reduces by 11.74% and 21.74% at the CSB and RHB addition with particle size < 0.25 mm,increase by 66.67% and 33.33% with particle size of >1 mm respectively. With the addition of biochar with particle size of 0.25～1 mm,there is no obvious change in the saturated hydraulic conductivity. This study indicates that the biochar addition can significantly reduce soil bulk density,increase soil field water holding capacity and capillary water holding capacity,and improve soil water conductivity. The research results can provide a theoretical basis for the application of biochar.
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备注/Memo
收稿日期:2020-09-16 修回日期:2020-10-13资助项目:国家自然科学基金(42067006); 贵州省科技计划项目(黔科合基础[2020]1Y177); 贵州省生态学国内一流学科建设项目(GNYL[2017]007)第一作者:屠丹(1996—),女,贵州六盘水人,硕士在读,主要从事土壤物理与水土保持研究。E-mail:2469606387@qq.com通信作者:毛天旭(1984—),男,甘肃武威人,副教授,主要从事生态水文学等方面的研究。E-mail:txmao@gzu.edu.cn