【摘要】 以盐碱荒地和不同生长年限的苜蓿地土壤为研究对象，采用野外采样调查与室内分析化验相结合的研究手段，研究了盐碱地不同生长年限苜蓿土壤有机碳及其组分的变化规律。结果表明：苜蓿生长5～7 a时，随着生长年限的增加，土壤有机碳含量显著增加；生长年限为2、3、6 a的苜蓿土壤活性有机碳含量与盐碱荒地相比显著增加；生长年限为7 a的土壤缓性有机碳含量、微生物量碳含量与生长年限为2、3、4、6 a的相比显著提高。因此，当地通过种植苜蓿改良盐碱地以持续生长7 a以上为宜。更多还原

【Abstract】 Taking soils of saline-alkali wasteland and alfalfa field with different growth years as the researchobjects, this study investigated the variation of soil organic carbon and its components in saline-alkali land withdifferent growth years of alfalfa through a combination of field sampling surveys and indoor analytical tests. The resultsshowed that soil organic carbon content increased significantly with the increase of growth years of alfalfa when plantedfor 5 to 7 years. The soil labile organic carbon content in the alfalfa field with a growth duration of 2, 3 and 6 yearsincreased significantly compared with that in the saline-alkali wasteland. The soil slow organic carbon content andmicrobial biomass carbon content in the soil with a growth duration of 7 years were significantly higher than those in thesoil with a growth duration of 2, 3, 4 and 6 years. Therefore, it is advisable for the local area to improve saline-alkaliland by planting alfalfa and maintaining a growth duration of over 7 years.更多还原