Present address: Center of Excellence for Invasion Biology, Conservation Ecology and Entomology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa.
Dynamics of the functional groups in the weed flora of dryland and irrigated agroecosystems in the Gangetic plains of India
Article first published online: 25 NOV 2008
© 2008 The Authors. Journal compilation © 2008 Weed Science Society of Japan
Weed Biology and Management
Volume 8, Issue 4, pages 250–259, December 2008
How to Cite
SINGH, A., SHARMA, G. P. and RAGHUBANSHI, A. S. (2008), Dynamics of the functional groups in the weed flora of dryland and irrigated agroecosystems in the Gangetic plains of India. Weed Biology and Management, 8: 250–259. doi: 10.1111/j.1445-6664.2008.00305.x
- Issue published online: 25 NOV 2008
- Article first published online: 25 NOV 2008
- Received 28 November 2006; accepted 24 April 2008
- functional types;
The relative abundance of the weed functional types in dryland and irrigated rice in the Kharif (summer) crop field and dryland lentil and wheat in the irrigated Rabi (winter) crop field was studied at the agricultural farm of Banaras Hindu University, Varanasi, India. A total of 22 species, belonging to 17 families, was recorded in the dryland and irrigated rice ecosystems and 18 species, belonging to eight families, were recorded in the dryland lentil and irrigated wheat ecosystems. The Importance Value Index (IVI) of the hemicryptophytes showed an increasing trend with the crop growth period in the case of the dryland rice, whereas in the irrigated rice plots, a reduction in the IVI of the hemicryptophytes, with a related increase in the importance of the therophytes, was observed as the crop attained maturity. Also, the trend of a decreased IVI was observed for the geophytes in the fertilized dryland rice plots. The principal components analysis (PCA) ordination showed the uniqueness of the crop plot in terms of weed species composition. The PCA analysis of the functional types on the basis of the crop plots indicated that the hemicryptophyte and therophyte weed species composition was heavily altered at the initial and final sampling, although the weed flora was dominated by the therophytes and geophytes. These results suggest the prioritization of hierarchical temporal management options for the functional weed types in different crop plots and that this approach warrants further investigation.