11 research outputs found
Studies on the Classification of Forest Vegetation with the Multivariate Analysis : I. Investigations on a Vegetation Model
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容ã¯ããªãè€éã§çŸå®ã®æ€çãšã®è¿äŒŒæ§ãé«ãã¢ãã«ã§ãã. åŸãããçµæãZurich-Montpellieræ¹åŒã«ãã£ãŠåºåããã®çš®çµæè¡šãåºæºã«ããŠæ€èšãé²ãã. æ€èšã®çµæ,8çš®ã®éå±€çåçž®åã¯ã©ã¹ã¿ãŒåæã¯,ããããåé¢æ§ãæªãããšãåºåã®åºæºãåŸãããªãããšããå®çšã«ã¯åããªãããšãå€ãã£ã. äž»æååæãšå ååæã¯å
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Studies on the Image of Gardens and Parks : I. Image of the Promenade Parks in Okayama City
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A Study on the Characteristics of Landscape Planting of Woody Plants in Japanese Gardens
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A Study on the Distributional Characteristics of Rocks in Japanese Gardens
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森æã®åå£åŒåžã«é¢ããç 究 (1) : åå£åŒåžãšæ°æž©ãšã®é¢ä¿ã«ã€ããŠ
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ã®é¢ä¿ã¯æ¬¡åŒã§ããããããšãã§ãããlog Y=aT+b (Y : CO_2g/m_2ã»day, T : æ°æž©â, a, b : åžžæ°) 8ã€ã®æå°ã«ã€ããŠ, åžžæ°a, bãæ¯èŒãããš, äžéšã®æå°ãé€ããŠaã®å€ã®éãã¯ãããªã, ã»ãŒ0. 03ã®éè¿ã«ãã£ããbã®å€ã¯æåã«ãã£ãŠããšãªã, åå£åŒåžéã®å¹ŽéãéããŠã®éãã«éèŠãªé¢ä¿ããã£ãŠããã幎éãéããŠã®CO_2çºçéãèšç®ãããš, 8ã€ã®æå°ãéããŠ2. 6 - 3. 8ton carbon/haã»yearã§ãã£ããäžè³èè©Šéšå°ã®ã¢ã«ããæã§, æ¯æã®èœèèœæéãšæ¯æã®åå£åŒåžã«ãã£ãŠæŸåºãããéãšã®å¯Ÿæ¯ãè©Šã¿ããå€å£ã¯æå°ãžã®ææ©ç©ã®äŸçµŠéãäœäžããã®ã«åŒåžéã¯å€§ãã, æ倱ã®æ¹ã倧ããã®ã«å¯Ÿã, å¬å£ã¯éã«äŸçµŠéã®æ¹ãå€ããªãåŸåããã£ãŠãããåå£åŒåžéã¯åäžæåå
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èŠã§ãããSince the studies on the soil respiration of forests in Japan are very few, it is very hard to get the sufficient knowledges in order to estimate the annual amount of carbon returned from soil to atmosphere. In present experiment, soil respiration was estimated by alkali absorption method at eight different kinds forests; five of them are located in Kyoto University Forest at Ashiu (northern part of Kyoto prefecture) and three of them are located in Kyoto University Forest at Kamigamo (near Kyoto University). The soil respiration increased exponentialy with the increase of temperature (Fig. 2), and the trend could be expressed by the following formula; log Y=aT+b (Y;CO2 g/m2  day, T;air temperature, â, a and b ; constant). The value of the constant "a" of almost of all investigated stands centered around 0.03 in spite of the diversity of site conditions (Table 1). There would be a tendency that the change of the rate of soil respiration depending upon temperature was similar in almost all of stands. The values of the constant "b" were quite different for each stand. As there were no remarkable differences in the value of the constant "a" between stands, it could be concuded that the value of the constant "b" and the temperature were effective to the annual amount of carbon dioxide evolved from forest soils. The range of the amount of carbon evolved from soils was 2.6--3.8 ton carbon/ha  year in eight investigated stands (Table 3). When compared the soil respiration with litter fall in Pinus densiflora forests in Kamigamo, the amount of litter fall were smaller than that of the soil respiration in summer, and the loss of soil organic matter would be recovered in autum and winter by the larger amount of litter fall. (Table 4)
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èŠããããšæããããTwo important subjects for measuring the soil respiration of forests, a variation in the amount of soil respiration among plots within a stand and daily fluctuations of amount of soil respiration for short periods of time were studied. The experiments were carried out, between April and December 1967, on 3 Hinoki (Chamaecyparis obtuia) stands, two Sugi (Cryptomeria japonica) stands, a Kanrenboku (Camptotheca acuminata) nursery stand, and an open stand adjacent to the Kanrenboku stand. The Hinoki stands were at Yoshino in Nara, at Hino in Shiga, at the Kamigamo Experimental Forest in Kyoto. The Sugi stands were at Yoshino in Nara. The Kanrenboku stand and the open stand were in the Experimental Nursery in Kyoto. The largest coefficient of variation between plots within a stand was 0.22-0.30 in the Hinoki stand in the Kamigamo Experimental Forest, and the smallest was 0.07-0.13 in one of Sugi stands in Yoshino. The gravel and root contents in the surface soils seemed to be one of the important factors affecting the value of the coefficient. According to our estimation 10 measuring plots even in the Hinoki stand in Kamigamo have been sufficient to estimate within 95% confidence limits and with 20% sampling error. Concerning with the daily fluctuation, a rain fall would bring about great fluctuations for a short period. The amount of soil respiration increased subsequently to the rain falls, though the rate of increase differed among the stands. In daily amount of soil respiration, the largest coefficient of variation was 0.38 in a plot in the Kanrenboku stand, and the smallest was 0.04 in a plot in a Hinoki stand in Kamigamo, where there was no rain fall during the measuring period. According to our estimation, measurment for soil respiration for 6 successive days in usual forests would suffice. In an unusual stand, like the kanrenboku stand, however 15 days would be necessary. In order to investigate soil respiration more thoroughly, the above results can be applied to further clarify the relationships between soil respiration and mean air temperature