刈割次数对紫穗槐生长和氮磷钾含量的影响

Effects of cutting frequence on growth and NPK content of Amorpha fruticosa

刈割是草地植物利用的主要方式之一,适度的刈割能促进植物的分蘖和再生,从而提高植物地上部分的生物量及营养元素氮磷钾含量,以获取单位面积营养物质的最大产量。本研究根据紫穗槐的生长特点,探讨不同刈割次数对紫穗槐生长高度、生物量及其植株茎、叶中氮磷钾含量的影响。结果表明,在4-9月紫穗槐快速生长期内,不同处理的植株地上生物量表现为刈割2次>刈割1次>刈割3次,茎叶中氮磷钾的积累量与地上生物量表现相同。综合各项指标,刈割2次是最合适的刈割次数。

Cutting is one of the main ways to utilize grassland plants,moderate cutting could promote tillering and regrowth,and thus increase above-ground biomass and nutritional element NPK.According to the growth characteristics of Amorpha fruticosa,the effect of cutting frequency on growth height,above-ground biomass and NPK content of stem and leaf were studied in this study.The results showed that,during rapid growth period which was from April to September,the above-ground biomass ranged as cutting twice treatmentoncethree times.A similar trend was also observed in terms of NPK content.These results implied the optimal cutting frequency for A.fruticosa was twice at least in present study.