| Co-Investigator(Kenkyū-buntansha) |
OKA Shuichi Faculty of Science, Tokyo Metropolitan University, 理学部, 助手 (50106605)
OHGA Nobuhiko Faculty of Science, Shizuoka University, 理学部, 講師 (70009059)
MASUZAWA Takehiro Faculty of Science, Shizuoka University, 理学部, 助教授 (40111801)
KAWAKUBO Nobumitsu Faculty of Education, Kagoshima UNiversity
RAMON Ferreyra Faculty of Natural History, San Marcos University (PERU)
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| Budget Amount *help |
¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1991: ¥6,000,000 (Direct Cost: ¥6,000,000)
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| Research Abstract |
1. The lomas vegetation was broadly formed in northern Chile in 1991. We investigated the macro scale distribution of these communities, as well as the local-scale distribution in Cerro Punta de Vacas, about 50km west of Copiapo, northern Chile. Comparing the meteological data, the macro-scale pattern of the communities, which seemed not to be influenced by topographical conditions, were produced by June and July rainfall. The local-scale pattern of the communities of Punta deVacas were markedly influenced by topographical conditions, exhibited the same topographic effect as found in "fog-precipitation" pattern.
2. An investigation on plant productivity was carried out on the south-east faced slope of lomas vegetation at Cerro Punta de Vacas. There were four types of vegetation : Calandrinia, Cristaria, Cordenia (Tiquilla) and Fortnetia. Biomass and water potential were measured on each type. The values of biomass were similar to those of low productivity grassland. Water potential of C
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ristaria and Cordenia decreased according as rising of air temperature, while the other species maintained nearly same value throughout the daytime.
3. The vegetation of Punta de Vacas area is classified into three types based on the dominant species : Calandrinia, Cristaria and Cordenia (Tiquilla) community. Both on 30th of October and 5th of November, the vegetation at each stand was surveyed according to number of species and the highest height and coverage of each species, and ten soil samples (25cm x 25cm x 2cm) were taken. Seeds were sorted out of the components selected from soil samples. Although the identification of these buried seeds was unsatisfactory, there were more species and seeds in number in the sample collected from the Calandrinia stand. In order to examine seed longevity under the ground, 200-300 seeds of each Calandrinia, Cristaria and Nolana were buried in the depth of 5cm under the ground surface. The seed germination rates of each species is expected to be examined in the occasion of next survey, for estimation of their seed longevity. Less
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