罗望子人工林土壤有机碳在不同团聚体中的特征

Characteristics of Soil Organic Carbon in Different Sizes of Aggregates Under Tamrindus Artificial Forest

研究了干热河谷地区不同种植方式的罗望子人工林内0—10,10—20,20—40cm土层土壤团聚体中的有机碳分布特征。结果表明,在所有样地中,1～0.5,0.5～0.25mm这2个径级的土壤团聚体有机碳最高,10～5mm团聚体有机碳最低。不同种植方式的人工林土壤团聚体有机碳差异较大,其中以罗望子+乡土草本,罗望子+百喜草2种种植方式的团聚体有机碳最高,罗望子+余甘子混交林内最低,但罗望子+乡土草本方式的团聚体有机碳高于罗望子+百喜草方式。光板地土壤团聚体有机碳在3个土层的差异较小。

Characteristics of soil organic carbon for different sizes of soil aggregates within 0--10, 10-20 and 20-40 cm layers were studied under different planting patterns of Tamrindus in the dry-hot valley of the Jin- sha River. Results showed that the content of soil organic carbon was the highest for 1-0.5 and 0.5-0.25 mm aggregates, but the lowest for 10-5 mm aggregates. There were significant variations in different plant ing patterns of Tamrindus artificial forest. The content of soil organic carbon was the highest in Tamrindus ＋local herbs and Tamrindus＋Paspalum natatu artificial forest and however, the former was greater than the latter. The content of soil organic carbon was the lowest in Tamrindus＋Phyllanthi emblice artificial for- est. The content of soil organic carbon in the three layers had small change in bare land.