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Methane consumption potential of soybean-wheat, maize-wheat and maize-gram cropping systems under conventional and no-tillage agriculture in a tropical vertisol
The Journal of Agricultural Science ( IF 2 ) Pub Date : 2020-05-22 , DOI: 10.1017/s0021859620000416
Bharati Kollah , Mahendra Bakoriya , Garima Dubey , Rakesh Parmar , J. Somasundaram , Abhay Shirale , S. C. Gupta , A. K. Patra , Santosh Ranjan Mohanty

Methane (CH4) consumption in agricultural soil is imperative for the mitigation of climate change. However, the effect of tillage and cropping systems on CH4 consumption is less studied. Experiments were carried out in Madhya Pradesh, India with soybean-wheat (SW), maize-wheat (MW) and maize-gram (MG) cropping systems under conventional tillage (CT) and no-tillage (NT). Soybean/maize was cultivated during the kharif season (July–October) and wheat/chickpea in the rabi season (October–March) for 9 years consecutively. Soil samples were collected during vegetative growth stages of soybean and maize from different cropping systems. Methane consumption, the abundance of methanotrophs as particulate methane monooxygenase (pmoA) gene copies, soil and crop parameters were estimated. Methane consumption rate was higher in NT and upper soil layer (0–5 cm) than CT and 5–15 cm depth. Methane consumption rate k ranged from 0.35 to 0.56 μg CH4 consumed/g soil/d in the order of MW>SW>MG in 0–5 cm. The abundance of pmoA gene copies ranged from 43 × 104/g soil to 13 × 104/g soil and was highest in MW-NT and lowest in MG-CT. Available nitrogen, phosphorus and potassium were higher in 0–5 cm than in 5–15 cm depth. Soil and plant parameters and abundance of pmoA genes correlated significantly and positively with CH4 consumption rate. No-tillage stimulated CH4 consumption compared to CT irrespective of cropping system and CH4 consumption potential was highest in MW and lowest in MG. However, the magnitude of the positive effect of NT towards CH4 consumption was higher in SW and MG than MW.

中文翻译:

热带垂直土壤中常规和免耕农业下大豆-小麦、玉米-小麦和玉米-克种植系统的甲烷消费潜力

甲烷 (CH4) 农业土壤的消耗对于减缓气候变化是必不可少的。然而,耕作和耕作系统对 CH 的影响4消费研究较少。在印度中央邦进行了常规耕作 (CT) 和免耕 (NT) 下的大豆-小麦 (SW)、玉米-小麦 (MW) 和玉米-克 (MG) 种植系统的试验。大豆/玉米在哈里夫季节(7 月至 10 月)和小麦/鹰嘴豆拉比连续 9 年的季节(10 月至 3 月)。在不同种植系统的大豆和玉米营养生长阶段收集土壤样品。甲烷消耗,甲烷氧化菌作为颗粒甲烷单加氧酶的丰度(pmoA) 估计基因拷贝、土壤和作物参数。NT和上层土层(0-5 cm)的甲烷消耗率高于CT和5-15 cm深度。甲烷消耗率 k 范围为 0.35 至 0.56 μg CH4消耗量/g 土壤/d 的顺序为 MW>SW>MG 在 0-5 cm。丰富的pmoA基因拷贝范围为 43 × 104/g 土壤为 13 × 104/g 土壤,MW-NT 最高,MG-CT 最低。有效氮、磷和钾在 0-5 cm 的深度高于 5-15 cm 的深度。土壤和植物参数和丰度pmoA基因与 CH 显着正相关4消费率。免耕刺激CH4与 CT 相比的消耗量,与种植系统和 CH 无关4消费潜力以 MW 最高,以 MG 最低。然而,NT 对 CH 的积极影响的大小4SW和MG的消耗量高于MW。
更新日期:2020-05-22
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