Chin J Plan Ecolo ›› 2006, Vol. 30 ›› Issue (6): 1005-1011.DOI: 10.17521/cjpe.2006.0129

• Research Articles • Previous Articles     Next Articles

COMPARISON OF THE PHOSPHORUS CHARACTERISTICS OF DIFFERENT CHINESE FIR CLONES

LIANG Xia1,2; LIU Ai_Qin1; MA Xiang_Qing1; FENG Li_Zhen1; H UANG Yi_Jiang1   

  1. 1 Forestry College, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2 State Key Laboratory of Estuarine and Coastal Research, East China Normal university, Shanghai 200062, China
  • Online:2006-11-30 Published:2006-11-30
  • Contact: MA Xiang_Qing

Abstract:

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.