生态环境学报2016，Vol.25Issue(7)：1164-1168,5.DOI:10.16258/j.cnki.1674-5906.2016.07.010
滇中高原云南松养分的回流及利用特征研究
Characteristics of the Retranslocation and Use of the Nutrient ofPinus Yunnanensis in Middle Yunnan Plateau
摘要
Abstract
Nutrient retranslocation and utilization is one of the most important strategies for trees to maintain nutrition and improve the adaptability, which has important significance for the growth of trees in barren soil. It is prominent forPinus yunnanensis to adapt to the soil which is barren and insufficient in P. Characteristics of nutrient (including N, P, K, Ca, Mg and Fe) content, nutrient retranslocation and use efficiency in needles of Yunnan pine (Pinus yunnanensis) at different forest ages (15, 30 and 45 a) and with the identical growth conditions, in Yuxi Mopan Mountain area, Middle Yunnan Plateau were analyzed by ICP-AES with microwave digestion and alkali N-proliferation methods. The analysis on the adaptability mechanisms ofPinus yunnanensis against the soil which is barren and insufficient in P is conducted from the perspective of the cyclic utilization of the nutrient and the results thereof show that, (1) The negative correlation between the absorption and content of the nutrient and the corresponding usage efficiency regardingPinus yunnanensis exists. The element outstanding in content and absorption is weak in respect of its usage efficiency, and vice versa. For example, Ca and N in needles has the lower use efficiency but higher content, while Fe (trace element) has the lower content but higher use efficiency, and there is a significant negative correlation between the concentration of N and Fe (P<0.01); (2) The nutrient content of Ca and Fe in fallen needles at different forest ages are greater than that of in fresh needles, appearing obviously accumulation in fallen needles, and the accumulation rate decreasing with the increase of forest age. The nutrient Mg has retranslocated only in 45 a Yunnan Pine (6.6%), in 15 and 30 a forest showing few accumulation and it’s use efficiency decreases with the increase of forest age; (3) Nutrients N, P and K are significantly retranslocated at different ages and the retranslocation rate and use efficiency shows a positive correlation; The retranslocation rate of N and K at different ages are greater than 30%. The nutrient P retranslocation rate (8.71%~61.49%) and use efficiency (2028.64~4179.20 g·g-1) are great and increases with the increase of forest age. All of these are the very important mechanisms for Yunnan pine to adapt to soil environment barren and lacking in P and these also further show that Yunnan pine is a fine afforestation tree species in the soil environment barren and lacking in P.关键词
滇中高原/云南松/养分回流/养分利用效率Key words
middle Yunnan plateau/Pinus yunnanensis/nutrient retranslocation/nutrient use efficiency分类
资源环境引用本文复制引用
惠阳,廖周瑜,王邵军..滇中高原云南松养分的回流及利用特征研究[J].生态环境学报,2016,25(7):1164-1168,5.基金项目
国家自然科学基金项目（41461052）；云南省高校优势特色重点学科（生态学）建设项目 （）
