Modelling competition of paired columns of Eucalyptus on interplanted grass

Autor: S. S. Grewal, G. Singh, J. S. Samra
Rok vydání: 1993
Předmět:
Zdroj: Agroforestry Systems. 21:177-190
ISSN: 1572-9680
0167-4366
DOI: 10.1007/bf00705229
Popis: Adequate evaluation of competition interfaces of tree growth on intercrops is an important consideration in the assessment of agroforestry systems. Spatial methods wherein positional effect of an observation with respect to trees or columns of trees can be accounted for were examined. Yield ofbhabbar grass (Eulaliopsis binata Ritz) planted under paired and staggered columns of Eucalyptus (Eucalyptus tereticornis Smith) was analysed for four years. Grass production at 7 positions recorded across staggered and paired tree columns was significantly different. Spatial correlations among contiguous observations across paired tree columns were significant. Cyclicity corresponding to seven columns of grass of 3.5 m distance between paired tree columns explained variation in grass production significantly during the first observation year. Additional competition interfaces at 1.75 m and 1.17 m appeared in the subsequent years. These competition interfaces were attributed to pairing of trees and staggering. Error distributions of fitting of cyclic patterns were more acceptable as compared to ANOVA. Possibilities of the use of this methodology in many other agroforestry situations are discussed.
Databáze: OpenAIRE
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