Pedosphere 16(5): 602--615, 2006
ISSN 1002-0160/CN 32-1315/P
©2006 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Evaluation of soil fertility under different Cupressus chengiana forests using multivariate approach |
PANG Xue-Yong1,2, BAO Wei-Kai1 and ZHANG Yong-Mei1 |
1 Chengdu Institute of Biology, Chinese Academy of Sciences, P. O. Box 416, Chengdu 610041 (China)
2 Graduate School of the Chinese Academy of Sciences, Beijing 100039 (China) |
| ABSTRACT |
| The distribution and growing conditions of Cupressus chengiana forests along with the physical and chemical properties of soils in Northwest Sichuan were studied in 2002 to investigate the conditions and characteristics of soil fertility of C. chengiana and to compare and investigate differences of soil fertility for six C. chengiana populations and their relationships with vegetation, climate and disturbance. The results of the study at 0-20 cm soil depth showed that 1) significant differences (P < 0.05) existed among populations for soil bulk density, soil total porosity, capillary porosity, maximum water-holding capacity, capillary water-holding capacity and topsoil natural water content; 2) chemical characteristics of soil organic matter, total N, total P, alkali-hydrolyzable N, available P, available K and cation exchange capacity were significantly different among the populations; and 3) based on the significant effect of soil fertility factors on forest growth, soil physical and chemical characteristics could be selected as an integrated fertility index (IFI) for evaluation of different C. chengiana populations. Principal component and cluster analyses showed significant differences probably due to the difference of vegetation conditions, management measurements, human-induced disturbances and environmental factors. In order to protect the soil ecological functions in fragile ecological regions, C. chengiana could be used in programs enclosing the hill for natural afforestation, natural forest protection programs, and programs replacing agriculture with afforestation measures. |
| Key Words: cluster analysis, Cupressus chengiana, dry valley, principal component analysis, soil fertility |
| Citation: Pang, X. Y., Bao, W. K. and Zhang, Y. M. 2006. Evaluation of soil fertility under different Cupressus chengiana forests using multivariate approach. Pedosphere. 16(5): 602-615. |
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