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Details of the paper
| Title |
INFLUENCE OF LONG-TERM RICE-DUCK FARMING ON THE COMPOSITION AND SPECIES DIVERSITY OF WEED COMMUNITY IN PADDY FIELDS |
| Author |
Shouhui Wei, Sheng QIANG, MA Bo, WEI Ji-Guang, CHEN Jian-Wei, WU Jian-Qiang, XIE Tong-Zhou, SHEN Xiao-Kun |
| Keywords |
rice-duck farming, population dynamics, species diversity, community evenness, integrated weed management |
| Journal |
Acta Phytoecologica Sinica |
| Year,Vol,No |
2006,30(1) |
| Pages |
9-16 |
| Abstract |
Weed infestation is a major threat to rice production and herbicides have been the prevailing method of weed control in paddy fields. But the increasing environmental pressure against herbicides leads farmers to consider alternative approaches to weed control, and place more emphasis on development of ecologically based weed management strategies. By using ducks to control weeds and keeping away from chemical herbicides, rice-duck farming system which integrated duck raising into rice cultivation provides an innovative approach to weed management. Field studies were conducted during 2000~2003 in Danyang, Jiangsu Province to evaluate the long-term influence of rice-duck farming on the structure and dynamics of weed community in paddy fields, including effects on population density, species richness, species diversity, community evenness and the similarity of weed community across years. The results showed that under long-term rice-duck farming system, the density of paddy weeds decreased annually and the trend was best fitted by the damping model y = k + a¡¤eb x, the parameter b indicated the rate of decrease of different weed populations. Of the six main weed species in paddy fields, population density of Fimbristylis miliaceae, Lindernia procumbens, Ludwigia prostrata dropped rapidly, followed by Monochoria vaginalis, Cyperus difformis, and Echinochloa crusgalli was the slowest. Rice-duck farming decreased the species richness and species diversity in paddy fields, and increased the evenness of weed community. As compared with the initiation of rice-duck farming, Sorensen¡¯s similarity indices of weed community in paddy fields decreased year-by-year, revealing that the structure of weed community has been substantially changed. Rice-duck farming provided a more diversified environment for weed growth and seed storage, which greatly limited the weed infestation in paddy fields. Consecutive surveys showed that rice-duck farming has good control effects on paddy weeds and the overall effects were above 99% at the end of the fourth year. Rice-duck farming is an effective ecologically based weed management strategy and has significant economic and ecological benefits. |
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2005 © Weed Research Laboratory,
Institute of Plant Protection, Chinese Academy of Agricultural Sciences
Address: No 2 West Yuanmingyuan Road, Haidian District, Beijing Postcode:
100094
Telephone: (010)62815937 Email: SHWEI@WSSC.ORG.CN
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