Study on the Correlation Between Rhizosphere Characteristics and Methane Emission in Rice

doi:10.7668/hbnxb.20190866

Abstract

Abstract: To explore the differences in rhizosphere characteristics of different rice varieties, which provided a basis for rice variety screening and rice field methane emission reduction.Early and late rice varieties with different methane emissions were used as test materials. Through the field experiment, the root-shoot ratio, root volume, root porosity, root activity and the activities of invertase and urease in rhizosphere soil were observed, and correlation analysis with methane emission flux.The results showed that the methane emission fluxes of early rice and late rice were consistent in seasonal changes, the highest in the tillering stage, and gradually decreased with the growth of rice, and there was almost no methane emission in the late growth period (milk maturity).The root system and rhizosphere soil characteristics of early rice and late rice showed different differences at different growth stages.There was a significant positive correlation between methane emission flux and root-shoot ratio in early rice (P<0.01), and a significant negative correlation with selenase activity in rhizosphere soil (P<0.01).There was a significant positive correlation between methane emission flux and root-shoot ratio and root porosity in late rice (P<0.01), and a significant negative correlation with root volume (P<0.01).Late rice methane emission flux had a significant positive correlation with root injury flow (P<0.05).It can be seen that the root-to-root ratio is a key rhizosphere characteristic that affects methane emissions from early and late rice varieties.

Key words: Rice, Rhizosphere characteristics, Methane emissions, Correlation

CLC Number:

S511.01

HUANG Yanan, FU Zhiqiang, WANG Boran, LI Chao. Study on the Correlation Between Rhizosphere Characteristics and Methane Emission in Rice[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(5): 115-123. doi: 10.7668/hbnxb.20190866.

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