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草地学报  2014 

青海湖农场退耕还林草后的土壤碳氮变化

DOI: 10.11733/j.issn.1007-0435.2014.03.006, PP. 469-474

Keywords: 青海湖农场,退耕还林草,土壤碳氮储量

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Abstract:

对青海湖农场退耕还林草地以及耕地和天然草地的土壤有机碳(SOC)、全氮(TN)含量及储量、无机氮(Ninorg)含量、土壤pH等基础理化指标进行了测定分析。结果表明退耕(还林草)地与耕地和天然草地土壤均偏碱性;退耕地及天然草地土壤容重及Ninorg含量均低于耕地;退耕地和天然草地0~5cm土层C/N显著高于耕地;退耕地和耕地0~5,5~10,10~20cm土层的SOC和TN含量低于天然草地;退耕还林草9年后各土层SOC和TN含量与耕地相比差异不显著,说明青海湖区持续耕作60多年后,要恢复土壤肥力仍需较长时间;对于0~30cm土层的SOC及TN储量,退耕地和天然草地与耕地无显著差异,而退耕地与天然草地之间差异显著(P<0.05);耕地、退耕地以及天然草地0~20cm土壤SOC含量分别占0~30cm土层SOC储量的68.7%,72.9%和78.6%;0~20cm土层TN含量分别占0~30cm土层TN储量的68.7%,72.7%和78.2%;与天然草地相比,按耕地开垦60年计算,0~30cm耕层内,C的损失率为0.11tC·a-1·hm-2,N的损失率为0.015tN·a-1·hm-2;土壤C和N含量与容重共同决定C和N储量的大小,因此土壤容重是影响土壤质量的重要因素之一。

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