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zgh20086835木虫 (职业作家)
小木虫高级伴读书童
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【求助】新鲜竹子的含水率是多少（最好是慈竹的） 已有4人参与
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说的要有根据哈，关系到小虫的”生死“哦 [ Last edited by zgh20086835 on 2010-4-20 at 11:22 ] |
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zwdbordeaux
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zgh20086835(金币+1):谢谢啊O(∩_∩)O~ 2010-05-01 19:05
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呵呵，好吧。我帮你搜索到了一些数据，但是你可以看到，它们的含水量是随着生长年龄，而有所变化的。记住，千万要看一下这个原文，用的时候要写上原文的引用！ 请看这个连接，table1  Variation of Moisture Content and Specific Gravity of Gigantochloa scortechinii Gamble along the Internodes Sixth Height Abstract The variation of initial moisture content and specific gravity in Gigantochloa scortechinii along the internodes sixth height were investigated. The culms were taken from the natural stand. This study found that the initial moisture content was decreased with the culms age and along the internodes sixth height. Nevertheless, the specific gravity gave an opposite result. -------------------------------------------------------------------------------- Introduction The initial moisture content and specific gravity of bamboo have a significant role in setting the processing line and equipments of the specific bamboo products and production. The moisture content for example, would influence the dimension stability and further degraded the strength, stiffness, processing and durability (Brown et al., 1952; Panshin & de zeeuw, 1970; Grewal, 1978). Mean while, specific gravity is a total woody material per volume and always linked to the physical and mechanical properties. Both factors were among the indicator in ruling the product segmentation of bamboo from specific culms age. Consequently, there are many research have been conducted on both moisture content and specific gravity intensively, and the information gathered is well established. However, the investigation on the scenario of both factors along the internodes height itself is still lacking. Hopefully, this study would lead a better understanding and knowledge in utilizing and processing of bamboo products with special reference to the whole internodes uses. Materials and methods Sources of materials Gigantochloa scortechinii with five different age classes namely 0.5, 1.5, 3.5, 5.5, and 6.5 years old from natural stand Nami, Kedah (northern part of Peninsular Malaysia) were selected. Age of the culms was marking starting the first day of their shooting period. Those culms were taken within the same clump. Each culm from internodes sixth were cut and immediately coated with solvent based paint and kept inside the ice box before being transferred to the laboratory. Preparation of the specimens Each culms from internodes sixth were cut into 3 cm long from bottom part (numbering as ring no.1) up to top of the internodes sixth height (numbering as ring no.2, 3, 4.....n) using a hand saw. The rings were then cut in diameter of 1 cm width with a chisel to get a final size of the specimen 3 cm length X 1 cm width X culm wall thickness. Determination initial weight of the specimens The initial weight of the specimens was determined with measuring device into two decimal places. All the unnecessary fibre and dust were removed before the reading were taken. This process was taken immediately to avoid air dried of the specimens. Determination volume of the specimens The volume of the specimens was measured by a weight displacement method. The process was done by soaking the specimens into distilled water without touching the glass. The specimens were maintained in distilled water until all air bubble come out and the final reading was taken. Determination of oven dried weight of the specimens The specimens were oven dried at the temperature of 103±2 O C for 24 hours. Inside the oven, the specimens were arranged with distance 1 cm each others to allow even heat flow. Initial moisture content and specific gravity The Initial moisture content and specific gravity were calculated using the following formula: Initial moisture content (%) = [(WI - WO)/WO] X 100 Specific gravity = WO/Vg Where, WI - Initial weight (g) WO - Oven dried weight (g) Vg - Volume of the specimens (cm 3 ) Results and discussions Variation of initial moisture content along the internodes sixth height Regardless of age and internodes height, the initial moisture content and specific gravity varied from 48.6 % to 90.5 % and 0.53 to 0.68 respectively (Table 1). The initial moisture content found in this study differed significantly (P<0.01) with age, internodes height, and the interaction between age and internodes height (Table 2). These results however were differed from those of G. scortechinii reported by Abd. Latif & Mohd. Zin (1992) taken from the Forest Research Institute Malaysia (FRIM) trial plot. Generally, Table 1 shows that the highest value of initial moisture content were observed in the 0.5 years old culms (90.5 %) while the lowest in 6.5 years old culms (48.6 %). The mean values also show significant decreased by age (r= -0.13). Abd. Latif & Mohd. Zin (1992) on their studies reported that the initial moisture content of bamboo culms were about 87.9 % (one year), 77.6 % (two years), and 69.1 % (three years) respectively. The swing pattern of the moisture content with age could be happened due to thickening process of fibre and parenchyma cells wall as young culms enter to the maturation stage. The variation that exist between both locations could probably best explained by the different harvesting time and climatic factors (Nami in northern region and FRIM in central region) as moisture content of the bamboo were tendency higher in rainy compared to dried season (Abd. Latif & Liese 1998). Within the internodes sixth height, the initial moisture content were found to be significantly decreased from bottom to the top portion of the internodes height (r= -0.13). This trend probably be due to the maturation process of the cells occurred along the internodes from top towards bottom portion (Itoh 1975, Itoh & Shimaji 1981, Itoh 1990). As this happened, the fiber and parenchyma cells wall most likely to be thicker along the internodes height itself. From Figure 1, the initial moisture content along the internodes sixth height of culms aged 0.5 years old ranged between 70.2-121.3 %, 50.3-80.5 % from the 1.5 years old, 42.3-77.3 % from the 3.5 years old, 36.2-52.3 % from the 5.5 years old, and 36.4-68.5 % from the 6.5 years old culms respectively (Figure 2). The highest value was observed in the 0.5 years old culms (51.1 %) and the lowest in the 6.5 years old culm (16 %). http://www.fao.org/DOCREP/ARTICLE/WFC/XII/0030-B4.HTM [ Last edited by zwdbordeaux on 2010-5-1 at 17:38 ] |
9楼2010-05-01 17:35:59
zgh20086835
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2楼2010-04-20 12:25:17
seamuse
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3楼2010-04-20 16:20:35
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4楼2010-04-20 17:17:57
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