平茬高度对中国沙棘萌枝能力及非结构性碳水化合物积累与分配的影响

为探讨中国沙棘(Hippophae rhamnoides ssp.sinensis)伐桩萌枝的养分投资与分配机制,以陕西省定边县15a中国沙棘人工林为研究对象,设置不平茬(对照)和平茬高度0、10、20 cm处理,分析伐桩萌枝能力、非结构性碳水化合物(NSC)对平茬高度的响应规律及其因果关系.结果显示:(1)随平茬高度...

Effects of Stubble Height on Sprouting Ability and Non structural Carbohydrates Accumulation and Distribution of Hippophae rhamnoides ssp. sinensis

We analyzed the dependencies of sprouting ability and the non structural carbohydrate (NSC) content on the stubble heights to investigate the nutrient accumulation and allocation mechanisms of sprouts in Chinese sea buckthorn (Hippophae rhamnoides ssp. sinensis). The experiment was conducted on a 15 year old Chinese sea buckthorn plantation in Dingbian County, Shaanxi Province. No stumping (as the control) and stubble height 0, 10, 20 cm were set to the process. The results showed that: (1) with the increase in stubble height, the sprouting number from stumps increased, the sprout survival and growth ability went up first and then went down, and NSC content of each component went up first then leveled off or went down. (2) The NSC contents in each part of clonal ramets for all stubble treatments were significantly higher than those of the control. (3) The NSC reserves went up first and then went down, the leaf and root NSC allocation ratios were the highest and significantly higher than the control when the stump of 10 cm. (4) The sprout growth was significantly positively correlated with the contents and reserves of NSC, while the sprout number, sprout survival number were potentially positively correlated with the contents and reserves of NSC. In conclusion, the contents and reserves of NSC and allocation ratio in leaves and roots could be increased by the appropriate height of stubble, promoting the growth and survival of stumping. The stump of 10 cm showed the best in the sprouting growth and survival ability.