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草业科学  2014 

退化草地补播草木樨、黄花苜蓿的生产力和土壤碳截获潜力

DOI: 10.11829\j.issn.1001-0629.2013-0434, PP. 361-366

Keywords: 退化草地,补播,深根系,垂直分布,碳截获

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Abstract:

?通过对补播两年后的草木樨(Melilotussuaveolens)、黄花苜蓿(Medicagofalcate)等5种群落的群落组成、生产力以及土壤有机碳储量的调查,分析了5种群落类型的土壤碳储量及群落生产力,探讨了补播对退化草地土壤碳截获及群落生产力的影响。结果表明,1)补播显著提高了退化草地的碳截获能力(P<0.05)。补播深根系牧草——草木樨、黄花苜蓿群落的土壤碳储量明显高于退化的芦苇(Phragmitesaustralis)群落,而自然演替的羊草(Leymuschinensis)和轻度退化的虎尾草(Chlorisvirgata)群落介于二者之间,表现为芦苇<虎尾草<羊草<草木樨<黄花苜蓿;2)土壤有机碳储量和含量具有明显的垂直分布特征,且各群落之间差异明显;3)补播改善了群落组成,大大提高了群落生产力(P<0.05),其整体变化趋势为虎尾草<芦苇<羊草<黄花苜蓿<草木樨。我国草地面积大,补播可能是实现退化草地恢复和固碳功能的最经济和最具操作性的途径之一。

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