摘要
本研究设置未修复对照(CK)、土壤强还原处理(RSD)、生物炭修复(BC)以及RSD与生物炭联合修复(RSD+BC),采用培养实验对比研究不同修复处理对设施蔬菜地土壤酶活性和温室气体(CO_(2)和N_(2)O)排放的影响.结果表明:相比CK,RSD和RSD+BC处理显著提高了β-葡萄糖苷酶(βG)、纤维二糖水解酶(CBH)、过氧化物酶(PEO)、β-N-乙酰氨基葡萄糖苷酶(NAG)和酸性磷酸酶(AP)的活性以及酶C:P与酶N:P值(P<0.05),而BC处理对上述5种胞外酶活性的影响并不显著.同CK相比,RSD、BC和RSD+BC处理的CO_(2)排放量分别提高了10.6、1.1和12.2倍;RSD处理的N_(2)O排放量亦显著增加,但BC和RSD+BC处理的则显著降低(P<0.05).与RSD相比,RSD+BC处理的N_(2)O排放量和综合温室效应(GWP)显著减少了86.9%和37.8%.结构方程模型分析表明:βG与土壤可溶性有机碳(DOC)对CO_(2)累积排放量具有直接正效应,且βG与CBH通过影响DOC含量间接影响CO_(2)排放;NO_(3)^(-)-N和NH_(4)^(+)-N对N_(2)O累积排放量具有直接显著负效应.综合考虑土壤酶活性和温室气体减排,RSD+BC联合修复效果更佳.
In this study,four treatments,i.e.,soil without any amendment as control(CK),soil amended with 2%(w/w)rice straw(RSD),soil amended with 2%(w/w)biochar(BC),and soil amended with 2%(w/w)rice straw and 2%(w/w)biochar(RSD+BC),were performed to compare their influences on soil enzyme activities and greenhouse gas emissions.The results showed that the activities ofβ-glucosidase(βG),cellobiohydrolase(CBH),peroxidase(PEO),β-1,4-N-acetylglucosaminidase(NAG),acid phosphatase(AP),and the values of enzyme C:P and N:P were significantly increased in RSD and RSD+BC treatments compared with CK(P<0.05),but there was no significant difference on enzyme activities in BC treatment.Soil CO_(2) emissions in RSD,BC,and RSD+BC treatments were increased by 10.6,1.1,and 12.2times,respectively.Soil N_(2)O emission in RSD treatment was also significantly increased,but significantly decreased in BC and RSD+BC treatments(P<0.05).Compared with RSD treatment,RSD+BC treatment notably decreased N_(2)O emission and global warm potential(GWP)by 86.9%and 37.8%.Structural equation model analysis also indicated thatβG and dissolved organic carbon(DOC)had a direct positive effect on soil CO_(2) emission,andβG and CBH indirectly influenced CO_(2) emission by affecting the DOC content.Moreover,soil NO_(3)^(-)-N and NH_(4)^(+)-N had a direct negative effect on N_(2)O emission.In summary,RSD+BC treatment was better in enhanced soil enzyme activities and decreased greenhouse gas emissions.
作者
吉春阳
何云华
孙小飞
马亚培
马红亮
高人
尹云锋
JI Chun-yang;HE Yun-hua;SUN Xiao-fei;MA Ya-pei;MA Hong-liang;GAO Ren;YIN Yun-feng(State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province,Fujian Normal University,Fuzhou 350007,China;School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China;Fuqing Modern Agriculture Development Center,Fuqing 350300,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2021年第2期974-982,共9页
China Environmental Science
基金
国家自然科学基金资助项目(31470628,31770659)
福建省公益类项目(2020R1002005)。
关键词
强还原处理
生物炭
生态酶化学计量
温室气体
结构方程模型
reductive soil disinfestation
biochar
soil eco-enzymatic stoichiometric ratio
greenhouse gas
structural equation model
