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在福建三明陈大国有采育场杉木幼苗小区,采用土钻法和内生长环法,以非隔离降水为对照,对隔离降水50%处理一年的杉木幼苗细根生物量和形态、化学计量学、比根呼吸、非结构性碳水化合物等功能特征进行研究.结果表明:与对照相比,隔离降水处理0~1 mm细根生物量显著降低,1~2 mm细根生物量差异不显著;隔离降水导致细根在形态上发生了适应性变化,0~1 mm和1~2 mm细根比根长分别增加21.1%和30.5%,0~1 mm细根组织密度显著降低,而比表面积显著增加.隔离降水导致细根氮的富集,但限制了对磷的吸收,氮磷比升高,导致营养失衡;隔离降水没有显著改变细根比根呼吸和非结构性碳水化合物含量,但导致1~2 mm细根可溶性糖、糖淀比显著降低,淀粉含量增加33.3%,表明其通过增加非结构性碳水化合物贮存比例以应对降水减少.
In Chenming, Fujian, there was a seedling plot of seedling growing area in the Chen Daguo, Fujian Province. By using the method of soil drilling and internal growth, the fine root biomass and morphology of Chinese fir seedlings with 50% The results showed that compared with the control, the fine root biomass at 0 ~ 1 mm was significantly reduced, while the fine root biomass at 1 ~ 2 mm was not significantly different The fine roots of 0 ~ 1 mm and 1 ~ 2 mm increased the root length by 21.1% and 30.5%, respectively. The density of 0 ~ 1 mm fine root tissue was significantly decreased, Surface area increased significantly.Separate precipitation led to the enrichment of fine root nitrogen, but limited the absorption of phosphorus, the ratio of nitrogen and phosphorus increased, resulting in nutritional imbalance; isolated precipitation did not significantly change the ratio of fine roots to root respiration and non-structural carbohydrate content, However, 1 ~ 2 mm fine root soluble sugar and sugar-starch ratio decreased significantly, and starch content increased by 33.3%, indicating that it could reduce precipitation by increasing the proportion of unstructured carbohydrate storage.