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中文摘要：
在长期抛荒贫瘠土壤上进行施用有机肥，种植紫花苜蓿并压青和施用有机肥＋种植紫花苜蓿并压青等处理，分析不同处理下土壤电导率、pH值、营养元素含量、土壤酶活性以及土壤微生物含量变化情况，确定其改良效果。结果显示，仅种植紫花苜蓿可以提高土壤C素含量，降低N素含量，而电导率等无明显变化；紫花苜蓿压青后，电导率上升、N素含量恢复到对照水平，脲酶活性和微生物数量等变化不明显；仅施加有机肥可以迅速提高电导率、有机质和矿质营养元素含量、细菌数量以及脲酶活性，但短时间内离子态矿质营养元素含量达不到作物正常需求水平；在施用有机肥情形下种植紫花苜蓿并压青后，土壤电导率、各营养元素含量、微生物数量的上升幅度以及土壤酶活性均显著高于施用有机肥处理，其中以每1m2施用250g有机肥并种植1．5g紫花苜蓿种子并压青的改良效果最好。
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