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    砒砂岩区沙棘人工林的萌蘖能力

    Sprouting capacity of artificial Hippophae rhamnoides forest in soft sandstone areas

    • 摘要: 为了达到快速治理砒砂岩区的目的,采用标准地调查方法,对内蒙古区鄂尔多斯市准格尔旗准格尔召镇近年来营造的不同林龄沙棘林萌蘖能力进行研究,以期对沙棘种植的设计、施工以及管理等提供依据。结果表明:沙棘具有极强的萌蘖性能,定植株2~8a的沙棘人工林分,其萌蘖能力为0.2万~8.0万株/hm2;沙棘萌蘖能力随林龄的变化,在2~4a逐渐增加,5~6a时达到最高,之后7~8a又逐步下降;萌蘖能力以水、肥等条件最好的沟谷地川滩地最高,平均可达2.1万株/hm2;不同立地条件类型间,萌蘖能力相差超过1倍;中等盖度(40%~70%)的沙棘人工林分,其萌蘖能力最高。生产实践中可充分利用沙棘萌蘖能力强的优势,适度降低种植密度,有效减少苗木和种植成本,从而实现砒砂岩区快速、经济、高效恢复植被、根治严重水土流失的目的。

       

      Abstract: For a quick method to controlling the soft sandstone areas,the author investigated the sprouting capacity of newly planted Hippophae rhamnoides forest in Zhungar township through the method of sample plot.The result shows that Hippophae rhamnoides has strong capability of sprouting,for example,2-8 years' artificial Hippophae rhamnoides forest can sprout 2 000-80 000 seedlings per hectare.The sprouting ability(SA) always changes with the age of stand,that is,the SA for 2-4 ages' forests increase gradually,and achieve the highest in 5-6 ages' forests,and gradually drop tendency for 7-8 years' forests.In the best site,like alluvial gully bed,the SA may reach 21 000 per hectare,one times higher than that of the bad site.In medium coverage of Hippophae rhamnoides(40%-70%),the SA appears to be the highest;whereas it drops rapidly for the coverage which is higher than 70% or lower than 40%.Thereby the SA can be used in the rehabilitation practice in order to reduce the original plantation density effectively,and seedling and planting costs as well,and restore the vegetation rapidly,economically,and effectively in the area for harnessing the severe soil and water losses.

       

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