长期施肥对棕壤有机碳储量及固碳速率的影响

发布时间：2018-01-15 07:06

本文关键词：长期施肥对棕壤有机碳储量及固碳速率的影响　出处：《环境科学学报》2016年01期 　论文类型：期刊论文

【摘要】：利用棕壤肥料长期定位试验,研究了不同施肥条件下棕壤有机碳在0~60 cm土层的含量和储量特征以及土壤固碳速率.试验共设6个处理,即氮磷肥有机肥配施(M_2NP)、氮肥有机肥配施(M_2N)、单施有机肥(M_2)、单施氮肥(N)、氮磷肥配施(NP)和不施肥处理(CK).结果表明:经过31年长期不同施肥,各处理土壤有机碳(SOC)含量和储量的剖面分布均呈现随土层深度增加而显著降低的规律.本试验条件下M_2NP、M_2N、M_2、NP、N、CK处理的耕层有机碳富集系数分别为0.465、0.455、0.407、0.48_2、0.393、0.471,表明耕层土壤对有机碳的保持强度最强.在0~60 cm土层土壤有机碳储量表现为M_2NP、M_2NM_2、NPNCK,有机肥和化肥配施能够显著提高土壤有机碳含量和储量.与试验前相比,CK处理各土层土壤有机碳含量和储量均显著降低.各处理碳库管理指数(CPMI)表现为M_2NPM_2NM_2NNPCK.分析不同施肥处理土壤固碳速率可知,与试验前相比,CK处理表现为碳的净释放,固碳速率达-401.4 kg·hm~(-_2)·a~(-1);固碳速率最高的为M_2NP,M_2N,分别达到489kg·hm~(-_2)·a~(-1)、440._2 kg·hm~(-_2)·a~(-1).综合结果表明,化肥、有机肥配施所产生交互效应更有利于棕壤有机碳储量的增加及固碳速率的提高.
[Abstract]:The content and storage characteristics of organic carbon in 0 ~ 60 cm soil layer and the soil carbon sequestration rate in brown soil under different fertilization conditions were studied by using the long-term location experiment of brown soil fertilizer. There were 6 treatments in the experiment. That is, nitrogen and phosphorus fertilizer with M2NPN, organic fertilizer with M2N, organic fertilizer with M2N, organic fertilizer with M2N and N with N). Nitrogen and phosphorus fertilizer combined with NPN) and no fertilizer treatment. The results showed that: after 31 years of long-term different fertilization. The profile distribution of soil organic carbon (SOC) contents and reserves decreased significantly with the increase of soil depth. The enrichment coefficient of organic carbon in the cultivated layer of CK treatment was 0.465U 0.455N 0.4070.48p 0.48p 0.393N 0.471, respectively. The results showed that the soil in the topsoil had the strongest ability to keep organic carbon, and the soil organic carbon storage in the 0 ~ 60 cm soil layer was M _ 2NPN _ 2 / M _ 2N _ 2N _ CK. Combined application of organic fertilizer and chemical fertilizer could significantly increase soil organic carbon content and reserves. The soil organic carbon contents and reserves of CK treatments decreased significantly. CPMI). The results were as follows: M2NPM2NNPCK.Analyzed the carbon sequestration rate of different fertilization treatments. Compared with before experiment, CK treatment showed net carbon release, carbon sequestration rate was -401.4 kg 路hm ~ (-1) 路a ~ (-1) 路h ~ (-1). The highest carbon sequestration rate was M _ 2NPN / M _ 2N, which was 489 kg 路hm ~ (-2) 路a ~ (-1). The results showed that the chemical fertilizer. The interaction effect of organic fertilizer application is more favorable to the increase of organic carbon storage and carbon sequestration rate in brown soil.
【作者单位】：沈阳农业大学土地与环境学院土肥资源高效利用国家工程实验室农业部东北玉米营养与施肥科学观测实验站;辽宁省生物炭工程技术研究中心;
【基金】：国家自然科学基金(No.30671231;31471940;41401325) 公益性行业(农业)科研专项(No.201303095) 辽宁省教育厅一般项目(No.L2014256)~~
【分类号】：S153.6
【正文快照】： 1引言(Introduction)土壤有机质(碳)对土壤肥力起着关键性作用,可以被视为评价土壤生产力和土壤质量的一个重要指标.土壤有机碳主要来源于动物、植物、根系分泌物和微生物残体,并处于一个不断分解和形成的动态变化过程中,是生态系统在特定条件下的动态平衡值(于沙沙等,2014).

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