Abstract

对景电灌区土壤次生盐渍化的1年生枸杞地和多年生枸杞地、未盐渍化的小麦地和苜蓿地4种土地利用方式土壤有机碳和养分状况进行对比研究, 结果表明: 在0~60 cm土层, 小麦地土壤有机碳含量及其密度、全氮和速效磷含量均最高, 苜蓿地均最低; 土壤全氮与有机碳含量呈极显著正相关(r=0.791, P<0.01); 4种利用方式C/N比值均较低, 多年生枸杞地C/N比值最高, 1年生枸杞地最低; 4种利用方式速效钾含量无显著差异; 苜蓿地容重显著高于其他3种利用方式, 这与其低的有机碳含量密切相关(r=0.420, P<0.01)。与小麦地相比, 1年生枸杞地土壤有机碳含量及其密度显著降低, 全氮和速效磷含量有所降低; 与1年生枸杞地相比, 多年生枸杞地土壤有机碳含量及其密度有所增加, 全氮含量显著降低, 速效磷含量显著增加。这意味着该区耕地土壤发生次生盐渍化以后, 土壤性状恶化; 种植枸杞使次生盐渍化土壤性状有所改善。

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