衬膜水稻修复荒漠化土壤对土壤碳库变化的影响

Effect of Film Lined Rice on the Change of Soil Carbon Pool in Repairing Desertification Soil

摘要: 探究衬膜水稻种植技术对荒漠化土壤碳库和碳库管理指数的影响，为荒漠化治理提供科学依据。本研究分析科尔沁奈曼旗沙地、稻田和休耕地0~15和15~30 cm土层的土壤全碳、有机碳、稳态碳和易氧化有机碳含量以及土壤碳库管理指数的变化特征。结果表明：种稻和休耕对土壤碳库影响显著，土壤全碳、有机碳、易氧化有机碳和稳态碳含量以及易氧化有机碳分配比例和碳库管理指数总体呈先显著升高后显著下降的变化趋势，大小差异顺序均为：稻田 > 休耕地 > 沙地。其中种稻后有机碳含量增幅最大达903%，休耕后有机碳含量降幅最大达83.09%。综上，研究区以风沙土为主，土壤贫瘠，修复难度大，沙漠种植衬膜水稻能够短期内提升土壤碳库库容，有利于土壤质量的持续改善，但休耕后土壤碳库各组分含量和碳库管理指数仅比沙地略高，土壤自然休耕后尚不能恢复到草原土壤水平。

Abstract: In order to explore the impact of film lined rice planting technology on desertification soil carbon pool and carbon pool management index, so as to provide scientific basis for desertification control. This study analyzed the variation characteristics of soil total carbon, organic carbon, non readily oxidized organic carbon, readily oxidized organic carbon and soil carbon pool management index in 0~15 and 15~30 cm soil layers of sandy land, paddy field and fallow land in Horqin Naiman Banner. The results showed that planting rice and fallow had a significant impact on soil carbon pool. The contents of soil total carbon, organic carbon, readily oxidized organic carbon and non readily oxidized organic carbon, as well as the distribution proportion of readily oxidized organic carbon and carbon pool management index, showed a changing trend of first significantly increasing and then significantly decreasing. The order of difference was: paddy field > fallow farmland > sandy land. Among them, the organic carbon content increased by 903% after planting rice and decreased by 83.09% after fallow. In conclusion, the study area is dominated by aeolian sandy soil, which is poor and difficult to repair. Planting film lined rice in the desert can improve the capacity of soil carbon pool in a short time, which is conducive to the continuous improvement of soil quality. However, the content of soil carbon pool components and carbon pool management index after fallow are only slightly higher than those in sandy land, and the soil can not be restored to the level of grassland soil after natural fallow.