摘要
分析长期耕作和秸秆还田对土壤团聚体固碳能力的影响,探讨团聚体铁铝氧化物的无机稳定机制,为选择合适的农田管理措施提供理论依据。试验设深松还田(STs)、深松不还田(ST0)、免耕还田(NTs)、免耕不还田(NT0)4个处理。用湿筛法测水稳性团聚体,用TOC分析仪测土壤有机碳和团聚体有机碳,用比色法测各形态铁铝氧化物,分析比较4个处理对各指标的影响。结果表明,与深松相比,免耕的平均重量直径、几何平均直径增加了18.6%、6.8%。与免耕相比,深松各粒级的有机碳含量按粒级从高到低依次提高了27.9%、28.8%、16.9%、11.0%和5.5%。深松的总碳储量比免耕提高了11%,秸秆还田的总碳储量比秸秆不还田提高了11%。深松全还田的表层土壤游离态铁氧化物含量相比于其他处理均提高了近50%。深松的无定形铁的含量比免耕提高了大约43%。深松的络合态铝的含量比免耕提高了65%。因此,长期深松结合秸秆还田能有效提高土壤固碳能力和团聚体无机稳定性。
The effects of long-term tillage and straw returning on soil aggregate carbon sequestration capacity was analyzed,the inorganic stability mechanism of Fe and Al oxides in aggregates was explored,and theoretical basis for selecting appropriate farmland management measures was provided.Four treatments were set up in the experiment including subsoiling with straw returning(STs),subsoiling without straw returning(ST0),no-tillage with straw returning(NTs)and no-tillage without straw returning(NT0).The water-stable aggregates were measured by wet sieve method.Soil organic carbon and aggregate organic carbon were measured by TOC analyzer.Various forms of iron aluminum oxides were measured by colorimetric method.The effect of four treatments on each index was analyzed and compared.The results showed that compared with subsoiling,the mean weight diameter and geometric mean diameter in no-tillage were increased by 18.6%and 6.8%,respectively.Compared with no-tillage,the soil organic carbon of>2,1-2,0.5-1,0.25-0.5 and 0.106-0.25 mm in subsoiling was increased by 27.9%,28.8%,16.9%,11.0%and 5.5%,respectively.The total carbon storage of subsoiling was increased by 11%than that of no-tillage.The total carbon storage of straw returning increased by 11%than that of no straw returning.The content of free iron oxide in the surface soil was increased by 50%than that of other treatments.Compared with no-tillage,the amorphous iron and complex aluminum in subsoiling were increased by 43%and 65%,respectively.Therefore,long-term subsoiling combined with straw returning could effectively improve soil carbon sequestration capacity and inorganic stability of aggregates.
作者
王宁
张仁政
刘振
吕金玲
沈莹
杨乾
李耕
宁堂原
WANG Ning;ZHANG Renzheng;LIU Zhen;LV Jinling;SHEN Ying;YANG Qian;LI Geng;NING Tangyuan(State Key Laboratory of Wheat Breeding/National Engineering Research Center for Efficient Utilization of Soil and Fertilizer/Key Laboratory of Crop Water Physiology and Drought Resistant Germplasm Improvement,Ministry of Agriculture and Rural Affairs/College of Agronomy,Shandong Agricultural University,Tai’an,Shandong 271018)
出处
《中国农学通报》
2024年第28期83-93,共11页
Chinese Agricultural Science Bulletin
基金
山东省重大科技创新工程“中低产田改良与产能提升关键技术研究”(2021CXGC010804-05-01)
山东省自然科学基金“耕作和秸秆还田下农田土壤固碳与呼吸对作物光合的贡献机制”(ZR2021QC189)。
关键词
深松耕作
秸秆还田
团聚体
碳储量
铁铝氧化物
土壤固碳能力
团聚体无机稳定性
subsoiling
straw returning
aggregate
carbon reserve
iron and aluminium oxide
soil carbon sequestration capacity
inorganic stability of aggregates
