PDF HTML阅读 XML下载 导出引用 引用提醒 氮肥对夏秋季茶树吸收根生物量和养分储量的影响 DOI: 10.5846/stxb201403200495 作者: 作者单位: 四川农业大学 园艺学院 四川成都,中国农业科学院茶叶研究所 农业部茶树生物学与资源利用重点实验室,四川农业大学 园艺学院 四川雅安,中国农业科学院茶叶研究所 农业部茶树生物学与资源利用重点实验室,四川农业大学 园艺学院 四川成都,中国农业科学院茶叶研究所 农业部茶树生物学与资源利用重点实验室 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金(41101286);国家茶叶产业技术体系资助(CAR-23) The effect of nitrogen fertilization on biomass and nutrient storage in the fibrous roots of tea plants(Camellia sinensis) during summer and autumn Author: Affiliation: College of Horticulture, Sichuan Agriculture University, Chengdu 611130,China;,,,,College of Horticulture, Sichuan Agriculture University, Chengdu 611130,China;,Tea Research Institute of Chinese Academy of Agricultural Science, Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agricultural, Hangzhou 310008,China Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:以12年生龙井43茶树为研究对象,在7月至翌年1月利用土钻法对连续5a施用不同氮肥处理后的茶树吸收根生物量和养分含量进行了研究。结果表明茶树吸收根生物量在0.34-0.72 mg/dm3之间,碳、氮、磷、钾和镁储量变异范围分别为12.6-25.2 mg/dm3、4.55-11.2 mg/dm3、0.47-1.19 mg/dm3、1.31-4.05 mg/dm3、0.30-1.19 mg/dm3。茶树吸收根生物量和各养分含量随月份变化呈现双峰型,峰值分别在8月和翌年1月,而7月和11月生物量和养分储量均较低。与不施肥对照相比,施用氮肥影响茶树吸收根生物量,氮肥施用对茶树吸收根生物量的影响因氮肥施用时间而异。不同氮肥施用水平下茶树吸收根总碳浓度和总碳含量均不存在显著差异。受氮肥施用时间影响,施氮对茶树吸收根氮浓度的影响不同月份间存在差异,其中7月、8月和1月施氮处理下氮浓度较高,而9月、10月和11月不施氮处理下氮浓度较高。氮肥施用对各月份茶树吸收根氮养分储量均没有显著影响。氮肥施用降低了部分月份茶树吸收根磷、钾和镁的浓度和储量。施用中等用量的氮肥能缩小茶树吸收根夏秋季氮磷钾镁养分储量的月份间差异。 Abstract:China first country to produce tea,and its artificial cultivation can traced back to 1000 BC. Tea(Camellia sinensis), one of the main economic crops in China, can be grown in the tropical and subtropical provinces. The fibrous roots are the most active parts of the root system and play important roles in absorbing water and nutrients. Although many factors(e.g., climatic and topographic conditions, soil properties) significantly influence the growth, turnover and the storage of nutrients in the fibrous roots, very few studies have investigated the effects of nitrogen fertilization. In this study, the dynamic changes to biomass and nutrient storage in the fibrous roots of tea plants were investigated in an experimental plantation that previously received different rates of nitrogen fertilizer[0, 285 and 712 kg hm-2 a-1] for 5 consecutive years to elucidate the effect of N fertilization on growth. The fibrous root samples were collected in the summer and autumn seasons, namely from July 2011 to January 2012, using a soil core. The biomass production of the fibrous roots varied from 0.34 g/dm3to 0.72 g/dm3and the carbon(C), nitrogen(N), phosphorus(P), potassium(K), and magnesium(Mg) storage values were 12.6-25.2 mg/dm3, 4.55-11.2 mg/dm3, 0.47-1.19 mg/dm3, 1.31-4.05 mg/dm3, and 0.30-1.19 mg/dm3, respectively. Biomass and nutrient storage in the fibrous roots showed bimodal monthly variations, being the highest in August, 2011 and January, 2012, but relatively low in July and November 2011. Fibrous root growth was initially promoted by N fertilization, but was inhibited during later stages, which might be explained by an alternative above-ground growth strategy. Nitrogen fertilization significantly affected the biomass production of fibrous roots, but its effects varied depending on the month. Biomass production showed an increasing trend in the treatment without N application in July, August, and October. However, in September the biomass production was relatively higher in the treatment receiving medium N, and rose with increasing N applications in December. The N application rates did not significantly affect the total C concentration and contents in fibrous roots. The N concentrations in the fibrous roots were considerably higher in July, August, and January but lower in September, October, and November,. The C/N ratio was significantly affected by the level of nitrogen fertilizer. The root C:N ratio was higher in the treatment without N fertilizer than in the other treatments in July, and in the treatments with N fertilizers in September, October, and November, However, it was lowest in the treatments with high N fertilizer applications in December and January. Surprisingly, N storage in the fibrous roots was un-affected by N fertilization rates. Nitrogen fertilization led to decreasing concentrations and storage of P, K, and Mg in fibrous roots, but the the decreasing tendency was alleviated by a moderate application of N. In conclusion, N fertilization has significant, but temporally variable effects, on the biomass and nutrient storage in the fibrous roots of C. sinensis. 参考文献 相似文献 引证文献