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草地与耕地土壤团聚体及有机碳含量对比分析——以内蒙古四子王旗为例
李青春1,2, 李跃进1,2, 王丹斓1,2, 余雅婧1,2, 王鼎1,2
1.内蒙古农业大学 草原与资源环境学院, 内蒙古 呼和浩特 010018;2.内蒙古土壤质量与养分资源重点实验室, 内蒙古 呼和浩特 010018
摘要:
[目的]通过探讨草地开垦为耕地后土壤团聚体及有机碳的变化规律,为内蒙古自治区四子王旗土地利用方式优化及草原保护提供理论依据。[方法]以内蒙古四子王旗农牧交错带栗钙土、灰褐土和草甸土3种土壤类型下草地和耕地为研究对象,对0-10 cm土层土壤团聚体组成、土壤有机碳、各粒径团聚体有机碳含量和各粒径团聚体对有机碳的贡献率进行了对比分析。[结果]栗钙土和灰褐土耕地与同地点草地相比,粒径>3 mm和0.25~3 mm的团聚体含量减少,而≤ 0.25 mm粒径团聚体含量增加,土壤有机碳和各粒径团聚体有机碳含量均有所降低,有机碳储存的主体由>3 mm粒径团聚体向0.25~3 mm粒径团聚体转化,非团聚体对有机碳的贡献率上升;草甸土草地土壤结构性差,有机碳含量较低,主要是出现盐化现象所致,但是开垦为耕地后,受有机肥长期施入和耕作的影响,其各项指标均有所改善。[结论]栗钙土和灰褐土草地在开垦为耕地后,土壤结构退化,有机碳稳定性下降。但是,根据实际情况开垦研究区内盐化草甸土草地进行农田耕作是可行的。
关键词:  草地与耕地  土壤团聚体  土壤有机碳
DOI:10.13961/j.cnki.stbctb.2019.01.008
分类号:
基金项目:高等学校博士学科点专项科研基金联合课题"脆弱草原带土地利用变化对土壤环境的影响研究"(20131515110005)
Comparative Analysis of Soil Aggregates and Organic Carbon Distribution in Grassland and Cultivated Land -A Case Study in Siziwang Banner of Inner Mongolia
Li Qingchun1,2, Li Yuejin1,2, Wang Danlan1,2, Yu Yajing1,2, Wang Ding1,2
1.College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China;2.Key Laboratory of Soil Quality and Nutrient Resources in Inner Mongolia, Hohhot, Inner Mongolia 010018, China
Abstract:
[Objective] To investigate the effects of grassland reclamation on the variation of soil aggregates and organic carbon distribution, in order to provide theoretical basis for land use optimization and grassland protection of Siziwang Banner, Inner Mongolia. [Methods] Three soil types (chestnut soil, gray cinnamon soil and meadow soil) were selected from the grassland and cultivated land in the farming-pastoral ecotone of Siziwang Banner, Inner Mongolia. The composition of soil aggregates, soil organic carbon, and soil organic carbon of aggregates with different particle sizes and their contribution rate in the 0-10 cm soil layer were analyzed. [Results] The content of aggregates with particle sizes >3 mm and 0.25~3 mm were lower, but the content of aggregates with particle size ≤0.25 mm was higher in cultivated land than in grassland with chestnut soil and gray cinnamon soil. Moreover, and soil organic carbon of each soil aggregates with different particle size were lower in cultivated land, compared with the other two soil types. The main body of organ carbon storage transformed from soil aggregate with particle size >3 mm to 0.25~3 mm soil aggregate. The contribution rate of non-aggregates to soil organic carbon was increased in the cultivated land soil. The structure of meadow soil was poor with low organic carbon content, which was mainly caused by the salinization, but it was improved by the long-term cultivation and application of organic fertilizer after reclamation for arable land. [Conclusion] After reclamation of the grassland with chestnut soil and gray cinnamon soil into cultivated land, soil structure was degraded and the stability of soil organic carbon was decreased, however, proper reclamation in meadow soil was feasible under suitable conditions.
Key words:  grassland and cultivated land  soil aggregate  soil organic carbon