淹水培养条件下不同作物秸秆对水稻土壤碳氮变化的影响

doi:10.19741/j.issn.1673-4831.2020.0942

摘要/Abstract

摘要： 为探究不同作物秸秆对水稻土壤有机碳(SOC)、全氮(TN)、矿质态氮(N_min)和可溶性有机碳氮(DOC、DON)，微生物生物量碳氮(MBC、MBN)及易氧化有机碳(EOC)的影响，采用80 d室内淹水培养方式，设置外源添加紫云英秸秆(ZYY)、小麦秸秆(XM)、油菜秸秆(YC)和不添加外源有机物料(CK)4个处理。结果表明：添加秸秆处理(ZYY、XM、YC)显著(P < 0.05)提高土壤有机碳含量，YC处理SOC含量增幅最高；添加秸秆处理对土壤TN含量无显著影响；XM和YC处理显著(P < 0.05)降低土壤矿质态氮含量；与CK处理相比，添加秸秆处理土壤DOC含量显著(P < 0.05)增加，且XM和YC处理DOC含量显著(P < 0.05)高于ZYY处理；添加秸秆处理土壤MBC和MBN含量均显著(P < 0.05)增加，其中，ZYY和YC处理MBC和MBN含量显著(P < 0.05)高于XM处理；与CK处理相比，ZYY、XM和YC处理土壤EOC含量分别提高20.34%、9.36%和10.53%，其中，ZYY处理显著(P < 0.05)高于CK处理，其他处理间差异不显著(P>0.05)；ZYY处理土壤DON含量显著(P < 0.05)提高，XM和YC处理DON提升效果不显著(P>0.05)。综上，添加秸秆可以显著提高土壤SOC含量，油菜秸秆培肥效果最好；紫云英秸秆对土壤活性碳、氮的提升效果最好，油菜秸秆和小麦秸秆次之。

关键词: 秸秆还田, 室内培养, 土壤有机碳, 土壤全氮, 矿质态氮, 活性碳, 活性氮

Abstract: In this study, we aimed to analyze the effects of different straws on soil organic carbon (SOC), total nitrogen (TN), mineral nitrogen, and activated carbon and nitrogen including dissolve organic carbon (DOC), microbial biomass carbon (MBC), easily oxidized organic carbon (EOC), dissolve organic nitrogen (DON) and microbial biomass nitrogen (MBN). An incubation experiment lasting for 80 days under continuous flooding was conducted. Four treatments including exogenous addition of astragalussinicus straw (ZYY), exogenous addition of wheat straw (XM), exogenous addition of rape straw (YC) and no exogenous additions (CK) were set. The results indicate that the addition of straw (ZYY, XM, and YC) significantly increased the SOC content, and the largest increase range was observed in the YC treatment. The addition of straw had no significant effect on the TN. The mineral nitrogen content in the soil decreased significantly under the XM and YC treatment, and it was increased by 3.29% under the ZYY treatment. Additionally, the straw addition increased significantly the DOC content relative to the CK treatment. The DOC concentration in the XM and YC treatment were significantly higher than that in ZYY treatment. All treatments with straw addition significantly increased the MBC and MBN content relative to the CK treatment, and the content of MBC and MBN in ZYY and YC treatment were significantly higher than that of XM treatment. Compared with the CK treatment, the EOC content was significantly increased by 20.34% in the ZYY treatment, while it was increased by 9.36% and 10.53% in the XM and YC treatment, respectively, with no significant difference to the CK. The ZYY treatment significantly increased the DON content, while XM and YC treatment had no significant effect on the improvement of DON. In conclusion, the addition of straw especially rape straw can significantly improve soil SOC content. Astragalus sinicus straw had the best effect on soil active carbon and nitrogen, followed by rape straw and wheat straw.

Key words: straw return, laboratory cultivation, soil organic carbon, soil total nitrogen, mineral nitrogen, activated carbon, activated nitrogen

中图分类号:

S154.1

崔子英, 张雅倩, 胡良, 闫颖, 杨雅君, 吕家珑. 淹水培养条件下不同作物秸秆对水稻土壤碳氮变化的影响[J]. 生态与农村环境学报, 2022, 38(1): 96-103.

CUI Zi-ying, ZHANG Ya-qian, HU Liang, YAN Ying, YANG Ya-jun, Lü Jia-long. Effects of Different Crop Straws on the Variation of Carbon and Nitrogen in Paddy Soil under Waterlogged Incubation Conditions[J]. Journal of Ecology and Rural Environment, 2022, 38(1): 96-103.

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