强还原与生物炭对土壤酶活性和温室气体排放的影响

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Abstract 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 of β-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 CO₂ emissions in RSD, BC, and RSD+BC treatments were increased by 10.6, 1.1, and 12.2times, respectively. Soil N₂O 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 N₂O emission and global warm potential (GWP) by 86.9% and 37.8%. Structural equation model analysis also indicated that βG and dissolved organic carbon (DOC) had a direct positive effect on soil CO₂ emission, and βG and CBH indirectly influenced CO₂ emission by affecting the DOC content. Moreover, soil NO₃^--N and NH₄⁺-N had a direct negative effect on N₂O emission. In summary, RSD+BC treatment was better in enhanced soil enzyme activities and decreased greenhouse gas emissions.

Key words： reductive soil disinfestation biochar soil eco-enzymatic stoichiometric ratio greenhouse gas structural equation model

Received: 07 July 2020

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	JI Chun-yang
	HE Yun-hua
	SUN Xiao-fei
	MA Ya-pei
	MA Hong-liang
	GAO Ren
	YIN Yun-feng

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JI Chun-yang,HE Yun-hua,SUN Xiao-fei等. Effects of reductive soil disinfestation and biochar on soil enzyme activities and greenhouse gas emissions[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 974-982.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/974

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