Effects of Straw Returning and Biochar Addition on Greenhouse Gas Emissions from High Nitrate Nitrogen Soil After Flooding in Rice-vegetable Rotation System in Tropical China

被引：0

作者：

Hu T.-Y. ^{[1
]}

Che J.-Y. ^{[1
]}

Hu Y.-J. ^{[1
]}

Chen Q.-Q. ^{[1
]}

Zhang D.-M. ^{[2
,3
,4
]}

Lei F. ^{[2
,3
,4
]}

Zeng J.-H. ^{[2
,3
,4
]}

Tang S.-R. ^{[1
]}

Wu Y. ^{[1
]}

Meng L. ^{[1
]}

机构：

[1] College of Tropical Crops, Hainan University, Haikou

[2] Agricultural Environment and Soil Research Institute, Hainan Academy of Agricultural Sciences, Haikou

[3] Scientific Observing and Experimental Station of Arable Land Conservation（Hainan）, Ministry of Agriculture and Rural Affairs, Haikou

[4] Hainan Key Laboratory of Cultivated Land Preservation, Haikou

来源：

Huanjing Kexue/Environmental Science | 2024年 / 45卷 / 03期

关键词：

biochar; nitrate nitrogen; nitrous oxide（N[!sub]2[!/sub]O）; soil microbial biomass carbon and nitrogen; straw;

D O I：

10.13227/j.hjkx.202303071

中图分类号：

学科分类号：

摘要：

In rice-vegetable rotation systems in tropical areas，a large amount of nitrate nitrogen accumulates after fertilization in the melon and vegetable season，which leads to the leaching of nitrate nitrogen and a large amount of N2O emission after the seasonal flooding of rice，which leads to nitrogen loss and intensification of the greenhouse effect. How to improve the utilization rate of nitrate nitrogen and reduce N2O emissions has become an urgent problem to be solved. Six treatments were set up［200 mg·kg−1 KNO3（CK）；200 mg·kg−1 KNO3 + 2% biochar addition（B）；200 mg·kg−1 KNO3+1% peanut straw addition（P）；200 mg·kg−1 KNO3 + 2% biochar + 1% peanut straw addition（P+B）；200 mg·kg−1 KNO3 + 1% rice straw addition（R）；200 mg·kg−1 KNO3 + 2% biochar+1% rice straw addition（R+B）］and cultured at 25℃ for 114 d to explore the effects of organic material addition on greenhouse gas emissions and nitrogen use after flooding in high nitrate nitrogen soil. The results showed that compared with that in CK，adding straw or combining straw with biochar significantly increased soil pH（P<0. 05）. The B and P treatments significantly increased the cumulative N2O emissions by 41. 6% and 28. 5%（P<0. 05），and the P+B，R，and R+B treatments significantly decreased the cumulative N2O emissions by 14. 1%，24. 7%，and 36. 7%（P<0. 05），respectively. The addition of straw increased the net warming potential of greenhouse gases（NGWP）. The addition of coir biochar significantly reduced the effect of straw on NGWP（P<0. 05）. The combined application of straw and biochar decreased NGWP，and P+B significantly decreased NGWP，but that with R+B was not significant（P>0. 05）. Adding straw or biochar significantly increased soil microbial biomass carbon（MBC）（P<0. 05），and that of P+B was the highest（502. 26 mg·kg−1）. The combined application of straw and biochar increased soil microbial biomass nitrogen（MBN），and that of P+B was the highest. The N2O emission flux was negatively correlated with pH（P<0. 01）and positively correlated with NH4+-N and NO3−-N（P<0. 01）. The cumulative emission of N2O was negatively correlated with MBN（P<0. 05）. There was a significant negative correlation between NO3−-N and MBN（P<0. 01），indicating that the reduction in NO3−-N was likely to be held by microorganisms，and the increase in the microbial hold of NO3−-N also reduced N2O emission. In conclusion，the combined application of peanut straw and coconut shell biochar could significantly inhibit N2O emission and increase soil MBC and MBN，which is a reasonable measure to make full use of nitrogen fertilizer，reduce nitrogen loss，and slow down N2O emission after the season of Hainan vegetables. © 2024 Science Press. All rights reserved.

引用

页码：1692 / 1701

页数：9

共 60 条

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