生态环境学报2017，Vol.26Issue(9)：1506-1513,8.DOI:10.16258/j.cnki.1674-5906.2017.09.008
岩溶区不同土地覆被方式对土壤团聚体有机碳的影响
Effects of Different Land Cover Types in Karst Area on Soil Aggregates and Organic Carbon
摘要
Abstract
Under the global climate change, land cover types, as one of the most important indicators that influencing the sequestration of soil organic carbon and the distribution of soil organic carbon in aggregates, have been increasingly focused on. Therefore, analysis of the effects of land cover on soil organic carbon is useful to study characteristics of the carbon cycle in Karst area. In this paper, content of soil organic carbon and the distribution of soil organic carbon in aggregates under the three land cover types (forest, shrub, and orchard field) were studied. Results showed that: (1) soil organic carbon content was obviously influenced by land cover types. The content of soil organic carbon was highest in forest (12.53~39.33 g·kg-1), second in shrub (8.48~27.99 g·kg-1), and the lowest in orchard field (8.40~18.61 g·kg-1), with the significant difference in the 0~20 cm layers and 40~70 cm layers among the three land cover types (P<0.05). The content of macro-aggregate (>0.25 mm) was higher than micro-aggregate (<0.25 mm) in every layer of the whole soil profile (0~100 cm). Stability of soil aggregates in forest and shrub was greater than that in orchard field. The content of macro-aggregate (>2 mm) in 0~90 cm layers of orchard field soil was obviously lower than that of forest and shrub soil (P<0.05). (2) Soil organic carbon associated with aggregate also influenced by land cover types. The content of organic carbon associated with macro-aggregate (>2 mm) under forest (12.32~39.88 g·kg-1) was obviously higher than that of shrub and orchard field in every soil layer (P<0.05). And the content of organic carbon associated with macro-aggregate (>2 mm) under shrub soil in 0~30 cm and 40~90 cm layers was significantly higher than that of orchard field. In addition, organic carbon content associated with macro-aggregate (>0.25 mm) was lower than that of micro-aggregate (<0.25 mm) under orchard field. However, there was no significant difference of the organic carbon content associated with aggregate among the different aggregate fractions of forest (0~100 cm layer) and shrub soil (0~30 cm layer) (P<0.05). (3) The distribution of soil organic carbon in macro-aggregate (>0.25 mm) was more than that of micro-aggregate (<0.25 mm). The contribution rate of macro-aggregate (0.25~2 mm) to soil organic carbon was highest, which were 40.31%~67.76%, 41.99%~59.38% and 48.72%~68.18% of forest, shrub and orchard field respectively. And the most significant difference of contribution rate to soil organic carbon appeared in macro-aggregate (>2 mm) among three land cover types. The contribution rates of micro-aggregates (0.053~0.25 mm and <0.053 mm) to soil organic carbon were respectively 13.08%~26.98% and 7.97%~20.06% under orchard field.关键词
岩溶区/土地覆被/土壤有机碳/团聚体Key words
Karst area/land cover/soil organic carbon/aggregate分类
农业科技引用本文复制引用
王浩,姚昕,杨慧,何振,李敦杰,丁玲玉..岩溶区不同土地覆被方式对土壤团聚体有机碳的影响[J].生态环境学报,2017,26(9):1506-1513,8.基金项目
国家自然科学基金青年基金项目(41402326) （41402326）
岩溶动力学重点实验室开放基金课题(KDL201506) （KDL201506）
聊城大学博士科研基金项目 （）
