The selective allelopathic interaction of a pasture-forest intercropping in Taiwan |
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Authors: | Chang-Hung Chou Shih-Ying Hwang Ching-I Peng Yeong-Chyn Wang Fu-Hsing Hsu Nien-June Chung |
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Institution: | (1) Institute of Botany, Academia Sinica, 11529 Taipei, Taiwan;(2) Taiwan Livestock Research Institute, Hsinhwa, 720 Tainan, Taiwan;(3) Hoshe Forestry Experiment Station, National Taiwan University, Nantou, Taiwan |
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Abstract: | Summary An allelopathic interaction of a pasture-forest intercropping system was evaluated by experiments conducted in field and by
laboratory assays. A study site was situated in the farm of Hoshe Forestry Experiment Station at Nantou County, Taiwan. After
deforestation of Chinese fir (Cunninghamia lanceolata), a split plot design of 4 treatments, namely litter removed, litter removed and kikuyu grass (Pennisetum clandestinum) planted, litter left, and litter left and grass planted, was composed. Field meaurements showed that the fir litter left
on the ground did not significantly inhibit the growth of weeds, kikuyu grass, and fir seedlings in the first four months
following deforestation, while kikuyu grass significantly suppressed the growth of weeds longer than four months but did not
reduce growth of fir seedlings. The aqueous extracts of fresh fir leaves, fir litter, and kikuyu leaves were bioassayed by
using lettuce and rice seeds and stolon cuttings ofBrachiaria mutica. Bioassays showed that fresh fir leaves produced significant phytotoxicity while fir litter and kikuyu grass gave limited
toxicity. Nine phytotoxic phenolics and many unidentified flavonoids were found in the leaf and litter of Chinese fir and
kikuyu leaves. A good correlation between the degree of phytotoxicity and phytotoxins was obtained, indicating an allelopathy
was involved. This finding suggests that allelopathy may contribute benefits in the intercropping system to reduce the need
for herbicides and to lessen the labor cost for weed control.
Paper No. 304 of the Scientific Journal Series of the Institute of Botany, Academia Sinica, Taipei, Taiwan, Republic of China.
This study was supported in part by grants of Academia Sinica, Taipei, and Council of Agriculture, Executive Yuan of the Republic
of China. |
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Keywords: | Allelopathy Chinese fir Cunninghamia lanceolata Kikuyu grass Pennisetum clandestinum Pasture-forest intercropping Phenolics Phytotoxin |
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