Keeping in view the expanding environmental pollution and irrigation water deficit, a pot experiment was performed for the upland (Huyou2, Hanyou737) and paddy rice cultivars (Taigeng8; Yixiang2292), to study soil liming effects on methane (CH₄) and nitrous oxide (N₂O) emission, bioavailability and accumulation of Cd, Pb in upland and paddy rice. Upland rice reduced 90% of soil CH₄ emission as compared to paddy conditions. Soil CH₄ emission decreased by 45% and 39% with dolomite, and it reduced by 35% and 33% with lime treatment both in upland and paddy conditions, respectively. Soil N₂O emission decreased by 44% and 52% with dolomite, and with the lime application, it was reduced by 37% and 44% for both upland and paddy conditions respectively. Reduction in soil DTPA-extractable Cd was between 37-53% and 43–80% with dolomite and 16–37% and 24–72% Cd decreased with lime application in upland and paddy conditions respectively. Soil DTPA-extractable Pb reduced by 27–44% and 25–53% with dolomite and 16–40% and 11–42% with soil-applied lime in upland and paddy conditions, respectively. Cd accumulation in rice grain was decreased by 47–88% and 62–79% with dolomite and 31–86% and 45–52% reduction by lime application in upland and paddy rice respectively. Rice grain Pb reduced by 58–91% and 66–78% with dolomite application and 32–71% and 44–71% with lime in upland and paddy rice, respectively. Our results showed that soil liming significantly reduced soil N₂O and CH₄ emission and Cd, Pb accumulation in rice grain, but dolomite was more effective as compared to lime. Altogether, results of this study suggest that upland rice can be cultivated in CdPb polluted soils with least soil CH₄ emission. Cd and Pb toxicity, accumulation, and N₂O emission in upland rice can be minimized by soil liming of 3 g kg⁻¹ and optimizing the nutrients composition of the soil.

考虑到不断扩大的环境污染和灌溉缺水，针对旱地（Huyou2，Hanyou737）和水稻品种（Taengeng8; Yixiang2292）进行了盆栽试验，研究了土壤对甲烷（CH ₄）和一氧化二氮（ N ₂ O）在陆地和水稻上的排放，生物利用度和Cd，Pb的积累。与水稻相比，旱稻减少了90％的土壤CH ₄排放。在高地和稻田条件下，白云石的土壤CH ₄排放分别降低了45％和39％，而石灰处理则分别降低了35％和33％。土壤N ₂白云石的O排放量减少了44％和52％，而施用石灰后，旱地和稻田的O排放量分别减少了37％和44％。在高地和稻田条件下，白云石对土壤中DTPA的可吸收镉的减少量在37-53％和43-80％之间，而石灰施用对镉的减少量分别为16-37％和24-72％。在旱地和稻田条件下，白云石对土壤DTPA的可萃取铅分别降低了27–44％和25–53％，而石灰土对土壤的DTPA可萃取铅分别降低了16–40％和11–42％。白云石对水稻籽粒中Cd的积累减少了47-88％和62-79％，而在旱地和水稻上施用石灰分别使Cd的累积减少了31-86％和45-52％。在旱稻和水稻中，施用白云石的水稻籽粒铅分别减少58-91％和66-78％，石灰施用石灰的铅分别减少32-71％和44-71％。稻谷中₂ O和CH _4的排放以及Cd，Pb的积累，但是白云石比石灰更有效。总之，这项研究的结果表明，可以在Cd Pb污染的土壤中种植CH ₄排放最少的旱稻。通过添加3 g kg ^-1的土壤石灰并优化土壤的养分组成，可以最大程度地减少旱稻中Cd和Pb的毒性，积累和N ₂ O排放。