摘要
利用田间试验,探讨生物炭与强还原处理(RSD)对退化设施蔬菜土壤可溶性有机质(DOM)的影响。处理为对照(CK)、生物炭修复(BC)、淹水(SF)、淹水覆膜(SFF)、强还原修复(RSD)、RSD与生物炭联合修复(RSD+BC),对比研究不同处理对0—20,20—40 cm土壤DOM含量及光谱特征的影响。结果表明:0—20 cm土层中,相比CK,其他处理土壤pH均显著增加,BC、SF、SFF和RSD处理的NO_(3)^(-)—N含量分别降低31.9%,59.4%,40.0%和22.3%(P<0.05)。RSD处理可溶性有机氮(DON)含量显著提高;RSD和RSD+BC处理的可溶性有机碳(DOC)含量分别显著提高188.2%和201.4%(P<0.05),DOC/DON比值增加,但使DOM芳香化程度和腐殖化程度降低,结构变得简单。土壤DOM组分以类富里酸和类腐殖酸物质为主,且RSD+BC处理的荧光强度达到最大。对于20—40 cm土层,各处理的荧光强度和DOC含量均显著降低,但相比CK,RSD和RSD+BC处理的DOC含量仍显著增加(P<0.05),而BC和RSD+BC处理使得DON含量降低。综上,RSD+BC联合修复短期内可以减缓土壤酸化,提升土壤DOC含量,但降低土壤DOM芳香化和腐殖化程度。研究结果可为退化设施蔬菜地土壤修复和环境风险评价提供科学参考。
A field experiment was conducted to investigate the effects of reductive soil disinfestation(RSD)and biochar(BC)application on dissolved organic matter(DOM)in degraded vegetable soils.In this study,six treatments,i.e.,(1)soil untreated(CK),(2)soil incorporated with 1%(w/w)biochar(BC),(3)soil flooded(SF),(4)soil flooded and covered with plastic film(SFF),(5)soil incorporated with 1%(w/w)alfalfa residue,flooded and covered with plastic film(RSD),and(6)soil incorporated with 1%(w/w)alfalfa residue and 1%(w/w)biochar,flooded and covered with plastic film(RSD+BC)were performed to compare the effects of different treatments on DOM content and its spectral characteristics in soil 0—20 cm and 20—40 cm of layers.The results showed that for 0—20 cm soil,compared with CK,soil pH value of other treatments was increased significantly,and NO_(3)^(-)—N contents of BC,SF,SFF,and RSD treatments were significantly decreased by 31.9%,59.4%,40.0%,and 22.3%,respectively.Soil dissolved organic nitrogen(DON)content was significantly increased by RSD treatment(P<0.05).The contents of dissolved organic carbon(DOC)in RSD and RSD+BC treatments were significantly increased by 188.2%and 201.4%(P<0.05),respectively,whereas the degree of DOM aromatization and humification was decreased under the two treatments.Soil DOM was mainly composed of fulvic acid-like and humic acid-like material,and the fluorescence intensity of DOM in RSD+BC treatment reached the maximum.For 20—40 cm soil,the fluorescence intensity and DOC contents of all treatments were decreased significantly compared with that of 0—20 cm soil.However,compared with CK,the DOC contents in RSD and RSD+BC treatments were still increased significantly(P<0.05),while the DON contents in BC and RSD+BC treatments were decreased.These results implied that the combination of biochar and RSD could further alleviate soil acidification in the short period,improve soil DOC content,and reduce the degree of soil DOM aromatization and humification.This study provides scientific guidance for the remediation and environmental risk assessment of degraded facility vegetable soil.
作者
闫代红
吉春阳
何云华
马亚培
马红亮
高人
尹云锋
YAN Daihong;JI Chunyang;HE Yunhua;MA Yapei;MA Hongliang;GAO Ren;YIN Yunfeng(State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province, Fujian Normal University, Fuzhou 350007;School of Geographical Sciences, Fujian Normal University, Fuzhou 350007;Fuqing Modern Agriculture Development Center, Fuqing, Fujian 350300)
出处
《水土保持学报》
CSCD
北大核心
2022年第2期283-291,共9页
Journal of Soil and Water Conservation
基金
福建省自然科学基金项目(2021J01143)
福建省公益类项目(2020R1002005)
国家自然科学基金项目(31470628,31770659)。
关键词
强还原处理
生物炭
设施蔬菜土壤
可溶性有机质
光谱特征
reductive soil disinfestation
biochar
facility vegetable soil
dissolved organic matter
spectral characteristics
