长施马粪对暗棕壤团聚体腐殖质数量和质量的影响

发布时间：2018-08-10 20:36

【摘要】：运用元素和红外光谱分析研究了暗棕壤长期施用马粪(每3年施肥1次)、施低量化肥和马粪配施高量化肥对水稳性大团聚体(2 mm和2~0.25 mm)、微团聚体(0.25~0.053 mm)和粉/黏粒粒级(0.053 mm)中腐殖物质-胡敏酸(HA)的分布及其结构特征的影响,探讨施肥对农田土壤肥力的贡献及其团聚体的固碳机制。施用马粪和马粪配施高量化肥分别提高(49.06%)和降低(31.04%)了2~0.25 mm大团聚体比例,3种施肥措施均提高了土壤有机碳(SOC)数量,但对土壤HA数量影响不显著。不同施肥措施对不同粒级团聚体中HA的分子结构特征影响不同,3种施肥措施均降低了2~0.25 mm大团聚体HA的缩合度,芳香性增加;微团聚体HA缩合度降低,脂族性增强;施用马粪提高了粉/黏粒HA的缩合度和脂族性,马粪配施高量化肥提高了粉/黏粒HA的缩合度和芳香性,施用低量化肥,粉/黏粒HA缩合度下降,芳香性提高。因此,长施马粪提高了土壤SOC数量,促进2~0.25 mm大团聚体的形成,大团聚体中HA的稳定性提高,利于土壤固碳,而0.25~0.053 mm微团聚体和0.053 mm粉/黏粒HA的活性增强,利于土壤肥力供给,这些团聚体是评估长施马粪对腐殖质质量产生影响的重要粒级。
[Abstract]:The effects of long-term application of horse manure (once every three years), low-dose fertilizer and high-dose horse manure on the distribution and structural characteristics of humic acid (HA) in water-stable macroaggregates (2 mm and 2-0.25 mm), micro-aggregates (0.25-0.053 mm) and powder/clay fractions (0.053 mm) in dark brown soil were studied by elemental and infrared spectroscopy. The contribution of fertilization to farmland soil fertility and the carbon sequestration mechanism of soil aggregates were studied. The proportion of soil organic carbon (SOC) was increased (49.06%) and decreased (31.04%) by applying horse manure and horse manure, respectively. The amount of soil organic carbon (SOC) was increased by three fertilization measures, but the amount of soil HA was not significantly affected by different fertilization measures. The molecular structure characteristics of HA in the grade aggregates were different, and the condensation degree and aromaticity of HA in the size of 2-0.25 mm were decreased and aromaticity of HA in the three fertilization treatments were increased; the condensation degree of HA in the micro-aggregates was decreased and the aliphatic property was enhanced; the condensation degree and aliphatic property of HA in the powder/clay were improved by horse manure application, and the condensation degree and aromaticity of HA in the powder/clay were increased by horse manure Therefore, long horse manure application increased the amount of soil SOC, promoted the formation of 2-0.25 mm macroaggregates, improved the stability of HA in macroaggregates, and was conducive to soil carbon sequestration, while the activity of 0.25-0.053 mm micro-aggregates and 0.053 mm powder/clay HA increased, which was conducive to the supply of soil fertility. These aggregates are important grain sizes for evaluating the quality of humus treated by manure.
【作者单位】：吉林农业大学资源与环境学院吉林省商品粮基地土壤资源可持续利用重点实验室;土壤与农业可持续发展国家重点实验室中国科学院南京土壤研究所;中国科学院东北地理与农业生态研究所;黑龙江省农业科学院黑河分院;吉林农业大学工程技术学院;
【基金】：国家自然科学基金项目(41571231) 吉林省科技发展计划项目(20170101162JC) 吉林省教育厅科学技术项目(JJKH20170313KJ)资助~~
【分类号】：S141;S152.4;S153.622

【相似文献】