Deep rice root systems reduce methane emissions in rice paddies,Plant and Soil

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Deep rice root systems reduce methane emissions in rice paddies
Plant and Soil ( IF 4.9 ) Pub Date : 2021-09-06 , DOI: 10.1007/s11104-021-05118-1
Huina Ding ₁ , Yang Jiang ₁ , Cougui Cao _{1,

2}

Affiliation

Aims

To investigate the effects of the spatial distribution of rice root systems on dissolved CH₄ and CH₄ emissions and the CH₄ transport efficiency of aboveground plant parts in paddy fields.

Methods

A two-year field and leaf cutting experiment was conducted on seven rice varieties, and we determined the dynamics of CH₄ emissions, root system traits and dissolved CH₄ concentrations in different soil layers, and the CH₄ transport efficiencies of the leaf and stem sheath.

Results

CH₄ emissions, the root distribution and the distribution of dissolved CH₄ concentration showed large discrepancies among the different rice varieties. Correlation analysis and structural equation modeling (SEM) revealed that CH₄ emissions had strong negative associations with root morphological traits (root dry weight, root area index and root volume density) and a clear positive correlation with dissolved CH₄ concentrations in the 0–20 cm soil layer. In addition, the root system had an indirect negative correlation with CH₄ emissions by influencing the dissolved CH₄ concentrations. Furthermore, root traits had strongly positive correlations with grain yield. In the aboveground parts, the CH₄ transport efficiencies of the leaf (20–70%) and stem sheath (30–80%) presented large differences among the different rice varieties, and CH₄ emissions exhibited significant positive correlations with leaf CH₄ transport efficiency and leaf dry weight.

Conclusions

Our results suggest that varieties with larger and deeper root distributions and lower leaf dry weight can decrease CH₄ emissions in paddy fields and maintain higher grain yield.

中文翻译：

深水稻根系减少稻田中的甲烷排放

宗旨

研究水稻根系空间分布对水田中溶解CH ₄和CH ₄排放以及地上部分植物CH ₄输送效率的影响。

方法

对七个水稻品种进行了为期两年的大田和切叶试验，我们确定了不同土壤层中 CH ₄排放的动态、根系特征和溶解的 CH ₄浓度，以及叶和茎的 CH ₄运输效率鞘。

结果

CH ₄排放量、根系分布和溶解CH ₄浓度分布在不同水稻品种间存在较大差异。相关性分析和结构方程模型 (SEM) 表明 CH ₄排放与根的形态特征（根干重、根面积指数和根体积密度）有很强的负相关，并且与0-20 年溶解的 CH ₄浓度呈明显的正相关。厘米土层。此外，根系通过影响溶解的 CH ₄与 CH ₄排放量呈间接负相关。浓度。此外，根系性状与籽粒产量呈强正相关。在地上部分，不同水稻品种叶片（20-70%）和茎鞘（30-80%）的CH ₄转运效率存在较大差异，CH ₄排放与叶片CH ₄转运呈显着正相关效率和叶片干重。