不同土地管理和利用方式喀斯特坡地养分和碳库管理指数的差异

发布时间：2019-06-19 18:09

【摘要】：文章选择环江喀斯特农业生态试验站坡地,设计封育、种植玉米、种植牧草、火烧、刈割和刈割除根6种处理方式,测定了不同处理下坡地土壤养分含量、有机碳、易氧化碳含量和碳库管理指数。结果表明,不同处理下土壤养分含量、有机碳含量和碳库管理指数均存在明显差异。土壤全氮、全磷、碱解氮、速效钾、有机碳和易氧化碳含量随土壤人为干扰的增大而减小,种植玉米、种植牧草和刈割除根处理由于人为干扰较大,上述指标显著低于封育和火烧处理。土壤全钾和速效磷含量均以种植玉米处理最高,而刈割处理最低。土壤缓效钾含量以封育最高,种植玉米和种植牧草处理次之,而刈割处理最低。与封育相比,各处理土壤碳库管理指数均显著降低,其中种植玉米和火烧处理最低,并显著低于其他各处理。此外,土壤全氮、全磷、全钾、碱解氮和有机碳含量随坡位的升高而降低。在喀斯特生态脆弱地区,自然封育有利于土壤养分和碳库管理指数的保持和提高。随着土壤人为干扰的增大,土壤养分含量和碳库管理指数下降。
[Abstract]:In this paper, six treatment methods were designed to seal, plant corn, plant forage grass, burn, mow and cut roots in Huanjiang Karst agroecological experimental station, and the soil nutrient content, organic carbon content, easily oxidized carbon content and carbon pool management index of sloping land under different treatments were determined. The results showed that there were significant differences in soil nutrient content, organic carbon content and carbon pool management index under different treatments. The contents of soil total nitrogen, total phosphorus, alkali-hydrolyzed nitrogen, available potassium, organic carbon and easily oxidized carbon decreased with the increase of soil human disturbance. The above indexes were significantly lower than those of closed culture and burning treatment due to the human disturbance of planting corn, planting forage grass and cutting roots. The contents of total potassium and available phosphorus in soil were the highest in corn treatment and the lowest in cutting treatment. The content of slow available potassium in soil was the highest in closed culture, followed by planting corn and forage, and the lowest in cutting treatment. Compared with closed culture, the management index of soil carbon pool in each treatment was significantly lower, among which planting corn and burning treatment were the lowest, and significantly lower than those in other treatments. In addition, the contents of total nitrogen, total phosphorus, total potassium, alkali-hydrolyzed nitrogen and organic carbon decreased with the increase of slope position. In Karst ecologically fragile areas, natural sealing is beneficial to the maintenance and improvement of soil nutrients and carbon pool management index. With the increase of soil human disturbance, soil nutrient content and carbon pool management index decreased.
【作者单位】：广西大学农学院;广西喀斯特地区节水农业新技术院士工作站;广西高校作物栽培学与耕作学重点实验室;中国科学院环江喀斯特农业生态试验站;
【基金】：国家科技支撑计划项目课题(2012BAD05B03) 国家自然科学基金(51469003) 中国科学院战略性先导科技专项子课题(XDA05070403) 国家高技术研究发展计划(863计划)(2011AA100504)
【分类号】：S158

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