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在西鄂尔多斯国家级自然保护区,对天然珍稀濒危植物沙冬青(Ammopiptanthus mongolicus)灌丛进行机械平茬。平茬后,萌芽时间提前了7d左右,经过3年的生长完全恢复到平茬前的生物量,新萌生的一级分枝平均长度可达70.5cm,基部直径15.72mm。同时,分析了平茬沙冬青种群的结构动态和土壤结构的变化。结果表明:依靠人工平茬改善种群结构,对沙冬青衰老株和干枯枝进行及时刈割更新复壮,最后形成了过渡类型结构介于稳定和衰老之间,即幼年植株比例低于稳定型而高于衰老型、壮年植株比例低于稳定型而高于衰老型,形成具有潜在恢复能力的种群结构。并且通过减少死亡植株对水分的消耗,使平茬区0~80cm土层3年平均含水率较未平茬区的高出0.57%。
In western Ordos National Nature Reserve, mechanical stubble was harvested from Ammopiptanthus mongolicus shrubs, a natural rare and endangered plant. After stubble, the germination time advanced about 7d, after three years of growth completely restored to stubble biomass, the average primary branch length of up to 70.5cm, the base diameter of 15.72mm. At the same time, the structure dynamics and the changes of soil structure of Aralia serrata populations were analyzed. The results showed that by means of artificial stubble to improve the population structure, the aged and dry branches of A. soongorica were mowed and rejuvenated timely. Finally, the transition type structure was formed between the stable and the aged, that is, the proportion of young plants was lower than that of the stable ones In aging, the proportion of mature plants is lower than that of the stable and higher than the aging, forming a population structure with potential restoration ability. And by reducing the consumption of water by dead plants, the 3-year average water content of 0-80 cm soil layer in the stubble area is 0.57% higher than that of the un-stubble area.