长期不同施肥对潮土有机碳储量的影响

doi:10.7668/hbnxb.2018.01.033

摘要/Abstract

摘要： 为了探讨土壤有机碳储量对长期不同施肥模式的响应特征，以潮土35年长期定位试验为依托，研究了不同施肥条件下土壤有机碳及其储量差异，分析了有机碳储量与碳投入量之间的关系。结果表明：不施肥和施肥处理有机碳含量均呈增加趋势，与不施肥处理（CK）相比，有机无机配施处理（MN、MNP、MNPK）有机碳平均含量增幅最大（90.6%~100.8%），单施有机肥处理（M）次之，并显著高于施用化肥处理（N、NP、NPK）。经过35年不同施肥后，土壤有机碳储量大小为：有机无机配施处理>单施有机肥>施用化肥处理；有机碳储量变化量与累积碳投入量之间呈极显著正相关性（R²=0.944 7，P <0.01），要想维持该试验点初始有机碳水平其累积碳投入量最小值为9.01 t/hm²。当累积碳投入量小于83 t/hm²时，土壤的固碳效率为18.2%，有机碳储量随外源有机碳投入量的增加而显著增加，当累积碳投入量大于83 t/hm²后，有机碳储量随外源有机碳投入量增加的幅度明显减缓，土壤固碳效率下降为11.5%，土壤有机碳储量变化量与累积碳投入变化量呈现出"线性+平台"趋势。

关键词: 长期施肥, 潮土, 有机碳储量

Abstract: In order to clarify the characteristics of soil organic carbon storage,soil organic carbon contents,soil organic carbon storage and its relationship with carbon input were studied under different fertilizations by a 35-years' long-term fertilization experiment in the fluvo-aquic soil.It was discovered that soil organic carbon contents in all treatments showed an increasing trend in this experiment.Compared to CK,soil organic carbon contents in MN,MNP,and MNPK treatments were the largest increase and the increased ranged was 90.6%-100.8%.Soil organic carbon contents in M treatment was significantly higher than the chemical fertilizers treatments.After 35 years of experiment,soil organic carbon storage in the MN,MNP,and MNPK treatments were higher than the organic manure and chemical fertilizers treatments,and M treatment was significantly higher than the chemical fertilizers treatments.In addition,strongly positive linear correlation was observed between cumulative carbon input and variable organic carbon storage (R²=0.944 7, P <0.01),and the least cumulative carbon input for maintaining the initial organic carbon level was about 9.01 t/ha.The soil carbon sequestration efficiency was 18.2% when the cumulative carbon input was less than 83 t/ha,and the organic carbon storage was increased with the increasement of exogenous organic carbon input.The soil carbon sequestration efficiency was only 11.5% when the cumulative carbon input was greater than 83 t/ha,and the increasement of organic carbon storage was decreased significantly with the increasement of exogenous organic carbon input.The change of cumulative carbon input and organic carbon variation showed a trend of linear and platform.

Key words: Long-term fertilization, Fluvo-aquic soil, Organic carbon storage

中图分类号:

S158

魏猛, 张爱君, 李洪民, 唐忠厚, 陈晓光, 王会, 诸葛玉平, 娄燕宏. 长期不同施肥对潮土有机碳储量的影响[J]. 华北农学报, 2018, 33(1): 233-238. doi: 10.7668/hbnxb.2018.01.033.

WEI Meng, ZHANG Aijun, LI Hongmin, TANG Zhonghou, CHEN Xiaoguang, WANG Hui, ZHUGE Yuping, LOU Yanhong. Effect of Different Long-term Fertilization on Soil Organic Carbon Storage in Fluvo-aquic Soil[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2018, 33(1): 233-238. doi: 10.7668/hbnxb.2018.01.033.

http://www.hbnxb.net/CN/Y2018/V33/I1/233

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