摘要
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 soils in a long-term experimental field over 29 years with different ]and uses types, including arable land, bare land, grassland and larch forest land as test materials, the distri- bution and storage of soil organic carbon （ SOC ） in the profile （ 0- 200 cm） in typical black soil （Mollisol） region of China were investigated. The results showed that the most significant differ- ences in SOC content occurred in the 0-10 em surface soil layer among all soils with the order of grassland〉arable land〉larch forest land〉bare land. SOC contents at 10-120 em depth were lower in arable land as compared with the other land use types. Compared with arable land, grassland could improve SOC content obviously. SOC content down to a depth of 60 cm in grassland was significantly higher than that in arable land. The content of SOC at 0-10 cm in bare land was significantly lower than that in arable land. Although there were no significant differences in SOC content at 0-20 cm depth between larch forestland and arable land, the SOC contents at 20-140 em depth were gener- ally higher in larch forestland than that in arable land. In general, SOC content showed a signifi- cantly negative relationship with soil pH, bulk density, silt and day content and an even stronger significantly positive relationship with soil total N content and sand content. The SOC storage in ara- ble land at 0-200 cm depth was significantly lower than that in the other three land use types, which was 13.6%, 11.4% and 10.9% lower than in grassland, bare land and larch forest land, re- spectively. Therefore, the arable land of black soil has a great potential for sequestering C in soil and improving environmental quality.
出处
《应用生态学报》
CAS
CSCD
北大核心
2015年第4期965-972,共8页
Chinese Journal of Applied Ecology
基金
公益性行业(农业)科研专项(201303126
201203030
201303011-1)资助
关键词
黑土
植被类型
土壤剖面
土壤有机碳
碳储量
black soil
vegetation type
soil profile
soil organic carbon
carbon storage.
