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| 不同施肥处理下我国典型农田土壤对可溶性有机碳的吸附特征 |
| Adsorption characteristics of dissolved organic carbon under different fertilization treatments in typical farmland soils in China |
| 投稿时间：2020-12-22 |
| DOI：10.13254/j.jare.2020.0769 |
| 中文关键词: 典型农田土壤，施肥处理，可溶性有机碳，吸附特征，冗余分析 |
| 英文关键词: typical farmland soil, fertilization, dissolved organic carbon, adsorption characteristic, redundancy analysis |
| 基金项目:国家自然科学基金重点项目（41620104006，U1710255） |
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| 摘要点击次数: 1544 |
| 全文下载次数: 1231 |
| 中文摘要: |
| 为分析不同施肥处理下我国典型农田土壤对可溶性有机碳（DOC）的吸附特征及其影响因素，选取黑土、灰漠土、潮土、红壤4种典型农田土壤，在不施肥（CK）、单施氮肥（N）、施氮磷肥（NP）、施化学氮磷钾肥（NPK）、有机肥配施化学氮磷钾肥（NPKM）5种施肥处理下，运用平衡吸附法测定DOC的吸附量。结果表明，不同土壤类型在同一平衡浓度下对DOC的吸附量有较大差异，整体表现为灰漠土、红壤>黑土>潮土。最大吸附量（Qmax）在各类土壤中表现为红壤>灰漠土>黑土>潮土。其中，各土壤类型的吸附特征在不同施肥处理下具有较大差异：灰漠土和潮土Qmax总体表现为NPKM>NPK>NP>N>CK；红壤Qmax总体表现为NPKM>N>NPK> NP>CK；黑土表现为NPKM、NPK处理大于其他处理，其中NPKM处理的Qmax比CK增加15.2%。4种土壤的吸附亲和力常数（K）在不同施肥处理下均表现为CK处理大于其他处理。4种土壤的解吸势（b）随着初始有机质含量的增加而增加，其中黑土的解吸势远大于其他3类土壤。通过冗余分析发现，土壤性质能解释DOC吸附特征参数全部变异的90.61%。第一冗余因子解释了DOC吸附特征参数全部变异的82.79%，主要与粉粒含量、黏粒含量、pH等有关；第二冗余因子解释了全部变异的7.82%，主要与土壤有机质含量有关。研究表明，不同类型土壤中，黏粉粒含量较高的土壤对DOC的吸附量更大，同一土壤类型下，有机质含量较高的土壤对DOC的吸附量更大。 |
| 英文摘要: |
| In order to provide a theoretical basis for the evaluation of carbon sequestration potential, we analyzed the adsorption characteristics and influencing factors of dissolved organic carbon(DOC)in typical farmland soils with different fertilization treatments in China. Four typical farmland soils, namely black soil, gray desert soil, fluvo-aquic soil, and red soil, were selected to apply different fertilizer levels of no fertilizer(CK), chemical N fertilizer(N), chemical NP fertilizer(NP), chemical NPK fertilizer(NPK), and NPK plus organic manure(NPKM)to determine the DOC adsorption capacities by the equilibrium adsorption method. The results showed that the DOC adsorption capacities of different types of soils at the same equilibrium concentration were very different, and were generally in the order of gray desert soil and red soil>black soil>fluvo-aquic soil. Qmax appeared in the order of red soil>gray desert soil>black soil>fluvoaquic soil in various soils. Among them, the adsorption characteristics of each soil type were quite different under different fertilization treatments. The general trend of Qmax in the gray desert soil and fluvo-aquic soil under different fertilization treatments were NPKM>NPK> NP>N>CK and in red soil was NPKM>N>NPK>NP < CK. The Qmax values of the NPKM and NPK treatments were significantly higher than those of the other fertilization treatments in black soil, and that of NPKM was increased by 15.2% compared with that of CK. The K values in the four soils under different fertilization treatments showed that CK treatment was higher than other treatments. The desorption potential (b)values in the four soils increased as the soil organic matter(SOM)increased, and the b value of black soil was far higher than those of the other soil types. Redundancy analysis showed that soil properties could explain 90.61% of the total variation of the DOC adsorption characteristic parameters. The first redundancy factor explained 82.79% of the total variation, which was mainly related to the silt content, clay content, and pH, whereas the second redundancy factor explained 7.82% of the DOC adsorption characteristic parameters, which was mainly related to the SOM content. The results of this paper showed that different types of soils with more clay particles have greater adsorption capacity for DOC, and the same type of soil with more organic matter content has greater adsorption capacity for DOC. |
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