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以典型黑土区29年长期定位试验处理下的土壤为对象,研究了农田、裸地、自然草地和落叶松林地4种土地利用方式下土壤剖面(0~200 cm)有机碳及碳储量的分布特征.结果表明:不同土地利用方式下表层(0~10 cm)土壤有机碳含量差异最大,表现为草地>农田>林地>裸地.农田10~120 cm各土层有机碳含量均低于草地、林地和裸地.与农田相比,自然草地对土壤有机碳提升作用明显,其0~60 cm各层土壤有机碳含量均显著高于农田;裸地表层(0~10 cm)土壤有机碳含量显著低于农田;落叶松林地0~20 cm有机碳含量与农田相比无明显变化,但其20~140 cm土层有机碳含量均高于农田.土壤剖面有机碳含量与p H值、容重、粉粒和粘粒含量呈显著负相关,与全氮和砂粒含量呈显著正相关.农田0~200 cm剖面有机碳储量显著低于其他3种利用方式,分别比草地、裸地和林地低13.6%、11.4%和10.9%.农田黑土在增加碳储量及改善环境方面具有很大潜力.
Taking twenty-nine years of long-term experimental plots of typical black soil areas as test objects, the distributions of organic carbon and carbon storage in the soil profile (0-200 cm) under four land use types of farmland, bare land, natural grassland and larch forest were studied. The results showed that the soil organic carbon content of the surface layer (0-10 cm) under different land use types was the highest, which ranged from grassland to farmland to forest land. , Forestland and bare land.Compared with farmland, natural grassland had a significant role in enhancing soil organic carbon, and soil organic carbon content in all layers from 0 to 60 cm was significantly higher than that in farmland. Soil organic carbon The content of organic carbon in 0 ~ 20 cm of larch forest land had no significant change compared with that of farmland, but the content of organic carbon in 20 ~ 140 cm soil layer was higher than farmland.The organic carbon content and p H value of soil profile, Bulk density, silt and clay content were significantly negatively correlated with total nitrogen and sand content was significantly positive correlation.The 0 ~ 200 cm section of organic carbon storage was significantly lower than the other three kinds of utilization, respectively, than the grassland, bare land and woodland Lower 13.6%, 11.4% and 10.9%. Black soil in farmland is increasing carbon stocks There is great potential for volume and environmental improvement.