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不同有机物料投入下黄河故道土壤有机碳积累的特征研究
杨苏,李传哲,王静,汪吉东,张永春,李辉信,艾玉春
1.农业农村部江苏耕地保育科学观测实验站/江苏省农业科学院农业资源与环境研究所;2.南京农业大学资源与环境科学学院
摘要:
【目的】黄河故道潮土区土壤有机质含量低、结构差是限制当地作物优质高产的重要问题,通过连续施用不同有机物料,探究不同有机物料投入下,黄河故道区典型土壤的有机质积累特征,为该区土壤的快速固碳提供理论依据和参考方案。【方法】试验共设置7个处理:单施NPK肥作为对照(CK),其他处理在单施NPK肥的基础上增施有机肥6000 kg/hm2 (M1)、有机肥12000 kg/hm2 (M2)、树枝菌渣6000 kg/hm2 (B1)、树枝菌渣12000 kg/hm2 (B2)、秸秆菌渣6000 kg/hm2 (S1)、秸秆菌渣12000 kg/hm2 (S2), 采用随机区组设计。【结果】与CK相比,外源有机物料施入会显著增加玉米产量和有机质含量,增幅范围分别为21.7%~58.3%和37.4%~70.1%,产量的增加直接导致进入土壤的秸秆残渣及根茬碳相应增加38.9 kg/hm2~76.9 kg/hm2,致使 B2处理增产保肥效果最佳。就有机物料种类而言,用量为12000 kg/hm2的树枝菌渣对土壤活性有机质的提升幅度最大,比相同用量的有机肥和秸秆菌渣高26.2%和57.0%,秸秆菌渣的碳库管理指数最高,但与树枝菌渣相比无显著差异。树枝菌渣由于碳氮比高,在土壤中分解慢,相同用量下,矿化消耗的碳量低于秸秆菌渣和有机肥,单位碳投入下的呼吸量比秸秆菌渣和有机肥低42.3%和29.3%。【结论】用量为12000 kg/hm2的树枝菌渣由于碳投入量大,矿化消耗少,对黄河故道潮土有机质提升效果最好,玉米增产最明显。
关键词:  土壤呼吸总量  有机质 有机物料  有机质积累 碳库管理指数
DOI:
分类号:S158.3
基金项目:江苏省农业科技自主创新资金项目(CX(17)-1001)、国家重点研发计划项目(2018YFD0800301)
Characteristics of soil organic carbon accumulation in the old course of the Yellow River under different organic materials inputs
YANG su1, LI Chuan-zhe1, WANG jing2, WANG Ji-dong1, ZHANG Yong-chun1, LI Hui-xin2, AI Yu-chun1,3,2,3
1.Agricultural Science and Technology Research Institute of Agricultural and Rural Sciences,Institute of Agricultural Resources and Environment,Jiangsu Academy of Agricultural Sciences;2.College of Resources and Environmental Sciences,Nanjing Agricultural University;3.China
Abstract:
[Objectives] The low soil organic matter content and poor structure in the fluvo-aquic soil area of ??the Yellow River are important issues that limit the high quality and high yield of local crops. Through the continuous application of different organic materials, exploring the organic matter accumulation characteristics of typical soils in the old road of the Yellow River under the input of different organic materials, providing theoretical basis and reference scheme for rapid carbon sequestration of soil. [Methods] A total of 7 treatments were set up in the experiment: NPK fertilizer was used as the control (CK), and other treatments were applied with 6000 kg/hm2 (M1) of organic fertilizer and 12,000 kg/hm2 of organic fertilizer on the basis of single application of NPK fertilizer (M2). ), dendritic residue 6000 kg/hm2 (B1), dendritic residue 12000 kg/hm2 (B2), straw slag 6000 kg/hm2 (S1), straw slag 12000 kg/hm2 (S2), randomized block design. [Results] Compared with CK, the application of organic materials significantly increased corn yield and organic matter content, ranging from 21.7% to 58.3% and 37.4% to 70.1%, respectively. The increase in yield directly leads to a corresponding increase in straw residues and root carbon in the soil of 38.9 kg/hm2 to 76.9 kg/hm2, which resulted in the best effect of B2 treatment. In terms of organic material types, the amount of 12,000 kg/hm2 of dendritic slag increased the soil active organic matter by a maximum, 26.2% and 57.0% higher than the same amount of organic fertilizer and straw slag, and the carbon storage management of straw slag. The index was the highest, but there was no significant difference compared to the dendritic residue. Due to the high carbon to nitrogen ratio, the dendritic slag is slowly decomposed in the soil. Under the same dosage, the carbon consumption of mineralization is lower than that of straw slag and organic fertilizer, and the respiration amount per unit carbon input is lower than that of straw slag and organic fertilizer. % and 29.3%. 【Conclusion】 The dendritic slag with the dosage of 12000 kg/hm2 has the largest carbon input and less mineralization consumption. It has the best effect on the organic matter of the tidal soil in the old course of the Yellow River, and the corn yield is the most obvious.
Key words:  total soil respiration  organic matter  organic material  organic matter accumulation  carbon store management index

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