目录
摘要 I
关键词 I
Abstract II
引言
绪论 1
1 选题背景 1
2 文献综述 2
3 方案论证 3
1 材料与方法 3
1.1 试验区概况 3
1.2 供试材料 3
1.3 试验设计 4
1.4 测定项目与方法 4
1.4.1 土壤理化性质的测定 4
1.4.2 有效态镉含量的测定 4
1.4.3 等温吸附试验 4
1.5 数据处理与分析 5
2 结果与分析 5
2.1 施用生物质炭对红壤性水稻土理化性质的影响 5
2.2 施用生物质炭对红壤性水稻土中有效态镉含量的影响 6
2.3 施用生物质炭对红壤性水稻土镉吸附特性的影响 7
2.4 土壤有效态镉含量与土壤理化性质的交互关系 9
3 讨论 10
3.1 施用生物质炭对红壤性水稻土理化性质的影响 10
3.1.1 施用生物质炭对红壤性水稻土物理性质的影响 10
3.1.2 施用生物质炭对红壤性水稻土化学性质的影响 10
3.2 施用生物质炭对红壤性水稻土吸附镉及镉有效性的影响 11
4 结论 11
致谢 12
参考文献 12
生物质炭对红壤性水稻土的理化性质
及其吸附镉的影响
摘要
本研究以湖南省镉污染农田为研究对象，通过长期田间定位试验，一次性施用不同量生物质炭：0、10、20、30和40 thm2，标记为CK、A10、A20、A30和A40，分别于水稻的分蘖期、扬花期和收获期采集耕作层（0–17cm）土壤，测定土壤理化指标，并采用一次平衡法进行等温吸附试验，研究生物质炭对红壤性水稻土的理化性质及其吸附镉的影响。结果表明：随着生物质炭添加量的增加，土壤容重显著降低，土壤孔隙度、田间持水量、pH和有机质含量显著升高，铵态氮含量无显著变化，硝态氮和有效磷含量呈上升趋势(除 *51今日免费论文网|www.jxszl.com +Q: ^351916072^ 
收获期)。三个时期的土壤有效态镉含量分别于A30、A40和A30处理下降至最低，比CK显著降低了46.86%、63.03%和43.41%。生物质炭处理下， Freundlich和Langmuir方程均能很好地拟合土壤对Cd2+的吸附，吸附更接近于非均匀表面的多分子层吸附，各处理下土壤对Cd2+的吸附能力表现为A30>A40>A20>A10。综上，生物质炭能调控红壤性水稻土的理化性质并增加土壤对Cd2+的吸附量，30 thm2的生物质炭添加量可作为修复当地镉污染农田的指导添加量。
EFFECTS OF BIOCHAR ON PHYSICOCHEMICAL PROPERTIES AND ADSORPTION CHARACTERISTICS OF CADMIUM IN RED PADDY SOIL
ABSTRACT
In order to examine the effect of biochar on physicochemical properties and adsorption characteristics of cadmium in red paddy soil, we investigated the physicochemical properties, explored isothermal adsorption characteristics of cadmium in red paddy soil by a primary equilibrium method, based on the long–term filed experiment which conducted in a cadmium–polluted farmland of Hunan province. Biochar was applied once to the red paddy soil at five treatments (0, 10, 20, 30 and 40 thm2). Soil samples of the plough layer(0–17 cm) were collected at tillering period, flowering period and harvest period of paddy. The results showed that the addition of biochar decreased soil bulk density, increased soil porosity, field capacity, pH value and the content of organic matter significantly, but has no significant influence on ammonium nitrogen content, and increased the contents of nitrate nitrogen and available phosphorus except in harvest period. The content of DTPA–Cd showed the greatest decreases at A30, A40, A30 treatments in different periods, decreasing by 46.86%, 63.03% and 43.41% remarkably compared with CK. The adsorption of Cd2+ into red paddy soil treated with biochar was well simulated by Freundlich and Langmuir models, which was similar to multi–molecular adsorption on heterogeneous surface. The adsorption capacity of Cd2+ in soil amended with biochar decreased in the order: A30>A40>A20>A10. In summary, biochar can regulate the physicochemical properties, increase Cd2+ adsorption content and reduce available cadmium content in red paddy soil. The application of 30 thm2 biochar can be used as the guidance for remediating the cadmium–polluted filed in this research.

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