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  

Differences in soil nutrient and carbon pool management index under different land management and utilization modes in karst slope region

作　　者：张亚杰[1,2] 钱慧慧[1,2] 李伏生[1,2,3] 苏以荣[4] 

机构地区：[1]广西大学农学院,广西南宁530005 [2]广西喀斯特地区节水农业新技术院士工作站,广西南宁530005 [3]广西高校作物栽培学与耕作学重点实验室,广西南宁530005 [4]中国科学院环江喀斯特农业生态试验站,广西环江547100

出　　处：《中国岩溶》2016年第1期27-35,共9页Carsologica Sinica

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)

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。The study area, located at Huanjiang karst eco system station of Chinese Academy of Sciences, falls into typical karst peak cluster depression landscape unit. In order to provide scientific basis for determi ning reasonable method of land management and utilization and further improving land quality under different slope land use conditions in karst region, the differences in soil nutrient and carbon pool management indexes in different land management and utilization conditions were investigated in this study. Six types of land use were implemented on the karst slope, via the measures of planting, vegetation burning, tree/grass mowing and mowin ples in 0 to 20 cm depth were collected at 5 localities respectiv land treatment, from which the soil nutrient content, organi natural afforestation, maize planting, pasture g plus root removal. Afterwards, the soil sam- ely in the upper, middle and lower slope of each c carbon, active organic carbon and carbon pool mowing treatment. The highest content of slowly available potassium in the soils occurred on the land with afforestation treatment, followed by that of maize and pasture planting treatments, while the lowest was on tree/grass mowing treatment. The lowest contents of soil organic carbon and active organic carbon were on those associated with maize planting treatment, decreased by 37.04% and 41.14%, respectively, comparing with the contents related to afforestation treatment. Except for the afforestation, the lands with the other treatments had a significant decrease in the carbon pool management index, of which the lowest occurred on those with maize planting and burning treatments. In addition, the contents of total nitrogen, total phos- phorus, total potassium, available nitrogen and organic carbon in soils decreased along with the slope alti tude. From this study, it is understood that in ecological vulnerable karst region, natural afforestation is the most beneficial to the maintenance and improvement of soil nutrient and carbon pool management index. On co

关 键 词：喀斯特地区 土地管理和利用方式 养分 碳库管理指数 

分 类 号：X144[环境科学与工程—环境科学]