Comparison of the phosphorus characteristics of different Chinese fir clones
Comparison of the phosphorus characteristics of different Chinese fir clones
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DOI：
10.17521/cjpe.2006.0129
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发表时间：
2006-11
影响因子：
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通讯作者：
Liu Ai-qin;Ma Xiangqing;L. Xia;Huang Yi-jiang;Feng Li-zhen
中科院分区：
文献类型：
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作者：
Liu Ai-qin;Ma Xiangqing;L. Xia;Huang Yi-jiang;Feng Li-zhen
背景和目的磷素缺乏是影响农林系统植物生产力的主要因素之一。施肥和土壤改良是满足传统农业中作物和林业管理中树木对磷的需求的主要措施。杉木（Cunninghamia lanceolata）是我国亚热带地区最重要的人工用材林树种，是一种速生、丰产、优质的万年青针叶树种。由于杉木人工林分布在北纬20° ~ 30°、东经100° ~ 120°之间，因此在南方杉木林中存在着许多不同的基因型。因此，选择磷利用效率高的杉木无性系是可能的。方法通过盆栽试验，在不同缺磷胁迫（重度、中度、轻度缺磷和正常供磷）下，分析8个不同杉木无性系的干物质积累、磷吸收效率和磷利用效率，比较其磷素特性。关键结果磷胁迫下不同无性系的干物质积累、磷吸收效率和磷利用效率存在显著差异。随着磷胁迫程度的加重，各无性系的干物质积累量和磷吸收效率下降，而磷利用效率提高。无性系8、9、24和37的干物质积累受磷胁迫的影响较小。磷胁迫显著影响无性系23的干物质积累。在磷胁迫下，无性系8的磷吸收和利用效率较高，无性系24和37的磷吸收效率较高，无性系9的磷利用效率较高。但无性系23的磷吸收效率和磷利用效率均低于其他7个无性系。结论杉木对磷的高效吸收和利用是其在低磷环境下的主要适应策略。
Background and Aims Phosphorus(P)deficiency is one of the main factors that influence plant productivity in agricultural and forestry systems. Fertilization and soil improvement are the primary practices used to meet the P demands of crops in traditional agriculture and of trees in forestry management. Chinese fir (Cunninghamia lanceolata), a fast_growing, evergreen coniferous tree with high yield and quality of wood, is the most important tree species of timber plantations in subtropical China. Since Chinese fir plantations range from about 20° to 30° N in latitude and 100° to 120° E in longitude, there are many different genotypes of Chinese fir among the forests in south China. Therefore, it is possible to select the Chinese fir clone with high phosphorus use efficiency. Methods Based on the pot experiment under the different phosphorus deficiency stress (heavy, medium, slight phosphorus deficiency and normal phosphorus supply), the dry matter accumulation, phosphorus absorption efficiency, and phosphorus use efficiency of eight different Chinese fir clones were analyzed to compare their phosphorus characteristics. Key Results There were significant differences in the dry matter accumulation, phosphorus absorption efficiency and phosphorus use efficiency among different clones under phosphorus stress. The dry matter accumulation and phosphorus absorption efficiency of different clones decreased whereas phosphorus use efficiency increased with increasing phosphorus stress. The dry matter accumulation of Clone 8, 9, 24 and 37 were influenced by phosphorus stress less than those of the other clones. Phosphorus stress significantly affected the dry matter accumulation of Clone 23. Higher phosphorus absorption and use efficiency in Clone 8, higher phosphorus absorption efficiency in Clone 24 and 37, and higher phosphorus use efficiency Clone 9 were found under phosphorus stress. However, the phosphorus absorption efficiency and phosphorus use efficiency of Clone 23 were lower than those of the other 7 clones. Conclusion High phosphorus absorption and use efficiency of Chinese fir are the major adaptive strategy under environment with low phosphorus availability.