不同刈割强度下伊犁绢蒿体内可溶性糖的变化及其地上与地下营养物质的关系

伊犁绢蒿是新疆蒿属荒漠草地常见的草地建群种之一，春季担负着家畜体膘的恢复和产羔育幼，秋季家畜要在该草地上贮存更多的能量和为繁衍下一代而进行配种。以蒿属荒漠草地为基础，以伊犁绢蒿为研究对象，结合野外定点取样，分析了伊犁绢蒿根、茎、叶中可溶性糖含量在不同刈割强度下随时间的动态变化，同时，在数据分析的基础上，明确了伊犁绢蒿秋季和春季营养物质贮存和消耗始期，并对不同刈割强度下伊犁绢蒿秋季根中可溶性糖的贮存量与来年春季植物体萌发消耗碳水化合物量之间的关联性做出判断。结果表明，根部可溶性糖含量在10月15日前后完成积累，在来年植株返青时，地下（根部）的营养物质就开始消耗，向地上运输，供植株返青和生长。C2处理不仅在秋季可溶性糖积累最高，而且在来年春季植株返青生长后在体内仍然能保持一个较高的水平，C0处理在秋季或春季植株体内可溶性糖含量在4个处理中总最低，直接影响株体越冬和次年返青。这表明不刈割并不是牧草最好的恢复方式，适度刈割有利于牧草的生长和体内可溶性糖的循环利用，但 C0只能使植株处于劣势或死亡。

Temporal variation of water soluble carbohydrate in Seriphidium transiliense under different mowing intensities and it how to transfer during seasonal change

Seriphidium transiliense is one of a common constructive species of sagebrush desert in Xinjiang, which is responsible for livestock recovery body fat, lambing, nurture young in spring pasture and storage next generation in autumn pasture. The paper analyzed the water-soluble carbohydrate dynamic change in roots, stems, and leaves of S. transiliense in different mowing intensities based on the sagebrush desert and field positional sampling. Meanwhile, based on the analysis for data, the beginning stage of nutrient storage and consumption of S. transiliense made clear, but also, the relevance was judged between water-soluble carbohydrate storage amount in autumn root and plant consumed carbohydrate for germination in coming year. The results showed that, the content of water-soluble carbohydrate in roots finished the accumulation on Oct. 15. When the plants are beginning turning green in the coming year, water-soluble carbohydrate stored in roots transferred from belowground back to aboveground automatically, which providing nutrients to turning green and regrowth. Water-soluble carbohydrate of C₂ treatment was different comparing to others, it not only had a highest sugar accumulation in autumn and maintained a higher content after plants turning green and regrowth in coming year, water-soluble carbohydrate content of C₀ treatment always the lowest one regardless of in autumn or in spring, metabolism was mild recession in plants body and maintaining its life reluctantly. Non-mowing is not the best recovery method, this explained that moderate mowing is advantageous to forage grass growth and recycling. But C₀ even presented inferior strength and the death.