茶园土壤团聚体分布特征及其对有机碳含量影响的研究

通过野外调查与室内分析相结合的方法,对茶园土壤团聚体的分布及其有机碳的含量及分布进行了研究.结果表明:茶园0-20 cm,20-40 cm土层土壤团聚体的分布均以>2.00mm和2～5 mm团聚体为主,分别占总团聚体的比例为56.57%和69.53%.茶园土壤团聚体平均重量直径平均值为1.02 mm,并且随着土壤层次的增加有增加的趋势.茶园0-20 cm土层0.25～0.5 mm粒径土壤团聚体有机碳含量最高,20-40 cm土层<0.25 mm粒径土壤团聚体有机碳含量最高,而2～5 mm粒径土壤团聚体有机碳含量在0-20 cm和20-40 cm土层均最低.茶园0-20 cm土层.各粒径团聚体中的有机碳分配比例均高于20-40 cm土层土壤.

Distribution Characteristics of Soil Aggregates and Organic Carbon in Tea Plantation

Distribution of soil aggregates and organic carbon were analyzed in tea plantation through the methods of field investigation and laboratory analysis. The result indicated that the soil granule structure of tea plantation was dominated by > 5 mm aggregate for all the two soil layers, accounting for 56. 57% and 69. 53% of all soil aggregate respectively. Mean weight diameter of soil aggregate in tea plantation was 1. 02 mm, which tended to increase with descending soil layers. Tea plantation soil aggregate ratio of organic carbon in 0. 25～0. 5 mm aggregate in 0—20 cm and <0. 25 mm aggregate in 20—40 cm were the highest and soil aggregate ratio of organic carbon in 2 —5 mm were the lowest for all the two soil layers. Tea plantation soil aggregate size of the distribution of the ratio of organic carbon 0—20 cm were higher than 20—40 cm soil layer.