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为更精确地评定竹干材积,研究了竹干形状的特性。形率按直径的分布趋于正态分布。胸高直径与形率的相关、胸高直径与形数的相关,直径与形高的相关都已作了研究,作为结论八个测定竹干材积的公式提了出来,划分为四个类型,其标准差都小于±5％。另一方面,对实积仔数也进行了研究、实积仔数随直径的增大而减小。竹产资源的计量单位,目前我国尚无统一的标准,有以重量为单位、有以株数为单位、也有以竹干材积为单位。就楠竹而论,由于竹干形体相差甚大,用株数计不能正确评定竹产资源和竹干材积,用重量计则又称量不便,加之含水率对竹干重量影响甚大,正确测定竹干含水率不是每一生产单位都很方便和可能的。比较一致的意见是赞同以材积作为评定单位较合理可行。为此有必要对楠竹干形及求积式进行研究。长宁是四川楠竹的主产区,历年来大量地提供国家建设所需的竹材。我们根据400余株标准竹和计算竹的实侧资料,对该地竹干形状进行探讨,在此基础上提出了八个竹干材积测定公式,供生产单位试用检验。
In order to more accurately evaluate bamboo stem volume, the characteristics of bamboo stem shape were studied. The distribution of shape rate tends to be normal distribution by diameter. The relationship between the thoracic diameter and the shape rate, the correlation between the thoracic diameter and the shape number, and the correlation between the diameter and the height of the figure have been studied. As a conclusion, eight formulas for determining the bamboo dry volume are proposed and divided into four types whose standards Differences are less than ± 5%. On the other hand, the number of real earners has also been studied, and the actual number of earners decreases as the diameter increases. Bamboo resources measurement unit, at present there is no uniform standard in our country, with the weight as a unit, with the number of units as a unit, but also to bamboo dry volume as a unit. As far as Nanzhu is concerned, since bamboo bodies are very different in shape, the number of bamboo plants can not be properly evaluated for their bamboo resources and bamboo-stem volume, and inconveniences are weighed in terms of weight. In addition, the moisture content has a great influence on bamboo weight, Moisture content is not convenient and possible for every unit of production. The more consistent view is that it is more reasonable and feasible to agree that the volume should be the unit of assessment. Therefore, it is necessary to study the dried bamboo shape and plotted plot. Changning is the main producing area of Sichuan Nanzhu. Over the years, it has provided a large amount of bamboo material needed for national construction. Based on the data of more than 400 standard bamboo and real side of bamboo, we discussed the shape of bamboo in this area, and on this basis, we proposed eight determination formulas of bamboo dry volume for trial testing of production units.