摘要
以东北典型黑土区林龄分别为8a,21a,30a,37a,52a的落叶松人工林为研究对象,通过对土壤干团聚体组成、不同粒级团聚体有机碳含量及有机碳贮量的测定、计算与分析,研究了不同林龄落叶松人工林土壤团聚体有机碳分配特征及其动态变化规律。结果表明:在0-30cm土层范围内,各粒级团聚体组成比例随粒级从大到小呈"∧"型分布,2～5mm粒级团聚体所占比例均最大,且与其他粒级存在显著性差异(P<0.05)。表层土壤各粒级团聚体有机碳含量均大于下层土壤,表层土壤中各粒级团聚体有机碳平均变化范围为32.17～48.75g/kg,下层土壤中的变化范围28.82～33.53g/kg,并均以2～5mm粒级团聚体有机碳含量最低。团聚体有机碳贮量随林龄的变化表现为大粒级团聚体(5～10mm)有机碳贮量的降低和小粒级有机碳贮量的增加。表层土壤有机碳贮量大于下层土壤有机碳贮量,但均以2～5mm粒级团聚体有机碳贮量最高,故可以认为土壤有机碳贮量的变化主要取决于各个粒级团聚体组成比例而不是各个粒级团聚体有碳含量。研究结果为进一步评价人工林植被恢复对土壤有机碳的影响提供了理论依据和参考。
Following 8,21,30,37 and 52-year-old larch（Larix gmelini） plantations in typical black soil region,a study was undertaken to examine soil organic carbon distribution characteristics of aggregates and dynamic changes of plantations by measuring and analyzing composition of dry aggregates,organic carbon content and organic carbon storage of different aggregate size fraction.Results showed that during soil depth of 0-30 cm,the composition proportion of aggregates was distribution in shape of ＂∧＂with decreasing size fraction.The percentage of 2~5 mm size fraction accounted the largest proportion and existed significant difference from those of other size fractions （P0.05）.The organic carbon contents of all different size aggregates in topsoil,range of 32.17~48.75 g/kg,were higher than those in subsoil,range of 28.82~33.53 g/kg.Lowest organic carbon content was found in 2~5 mm aggregate and which was significant different from those of other size fraction aggregates （P0.05）.The changing trend of organic carbon storage during soil profile was very similar to that of dry aggregate distribution among larch plantations with different ages.The soil organic carbon storage in topsoil was higher than that in subsoil.Organic carbon storage in 2~5 mm aggregate was also the highest in all size fractions.We concluded that changes of organic carbon storage in soil aggregates were mainly determined by the composition of soil aggregates,but for the organic carbon contents.It presents a theoretical basis for further researches and assessments on SOC of larch plantation.
出处
《水土保持学报》
CSCD
北大核心
2010年第5期208-212,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(30872068)
黑龙江省重大科技攻关项目(GA06B302-3)
东北林业大学研究生论文资助项目(GRAM09)
关键词
落叶松人工林
黑土
团聚体
土壤有机碳
larch plantations
black soil
soil aggregate
soil organic carbon
