| As an excellent fast-growing shoot-used and timber-used sympodial bamboo, Dendrocalamopsis oldhami is one of the main cultivated bamboo species in southern China. Recent years, with the increasing demand for Dendrocalamopsis oldhami shoots in a widely grown at the same time, in the cultivation and transformation process, due to management unscientific, methods shall not be treated, bamboo shoot yield can not be effectively improved. For bamboo in business management problems, as defined bamboo scientific management, this test on the aerial parts, bamboo shoot underground part and shoot quality, the underground part of the study, including bamboo stump system of underground structure, the root structure, different conditions of bamboo stump shoot ability.1. The site condition of artificial operations A (represented by mountains red), B (represented by agricultural land), C (represented by riparian alluvial soil) with no artificial operated site condition D (represented by riparian alluvial soil) part of the research carried-out on the ground, the results showed that:the artificial condition of site operations, retained trees 4 to 6/plexus, aged 1a～2a raw bamboo help improve production, including site condition B shoots the highest yield to 29400 kg · hm-2, its bamboo trees is 4.1/plexus, bamboo density of 5433 · hm-2; different operating conditions, site condition A, B, C and D in bamboo DBH site condition, Day long, bamboo high,status of minor details there are significant differences, which is related to the management without manual operation; leaf area index of the size of the order is:B> D> A> C, site condition B, leaf area index reached a maximum of 11.13, site condition C is the smallest leaf area index, was 8.48, in the analysis of leaf area index and shoot yield relationship, combined with the year-old bamboo leaf area per unit area of leaf area index and index mutual analysis will be more comprehensive. 2.For different site conditions under the stump structure studies show that:In the stump width size comparison, D> A>C> B, and site condition A, B, C and site condition D there was a significant difference:bamboo stump quantity comparison, D> A> B> C, where site condition B, born la,2a largest proportion of the number of raw bamboo stump was 48.1%, and most conducive to producing shoots,3a raw bamboo stump ratio of the number in the range of 17.1%～17.8%,changes little difference,3a bamboo stump above the number of students in the range of 33.6%～52.0%, with the number of years between the proportions of raw bamboo stump large differences, indicating that with or without artificial management, underground bamboo stump age structure are unreasonable; Compare diameter of 5cm length of bamboo stump, in the artificial management conditions in the same site, bamboo stump length with increasing age showed a decreasing trend, while in the site condition D, no such trends, indicates that management is conducive to artificial bamboo stump length increases; bamboo stump diameter size was similar to the relationship between diameter parabolic trend changes occur between the two peaks, site condition A stump diameter of 5.5cm, the diameter of the largest bamboo shoots is 8.89cm, site condition D, stump diameter 4.5cm, the shoots maximum diameter 7.68cm; bamboo shoots growing on the stalk base position is fixed, the distribution range of 2 to 9, bamboo shoot size in the order of:leader> two head> Trinocular> Anura.3.For different site conditions of bamboo root structure research indicated that:root mainly distributed in culm base on bamboo roots, culms handle hardly rooting; comparison of different site conditions root amount, site condition C 1a,2a root number, average is 615.5, followed by site condition A for 576.5, site condition B is 573.5, site condition D for a minimum of 430.5, in site condition A, B, C, root number and average root number corresponding to each section of culm base are bigger than the site values of condition D, difference in root total site condition D 14.3%-27.2%; bamboo root mainly distributed in 0-40cm soil layer,4 indexes of bamboo root dry mass and root length and root surface area and volume for the soil reached more than 85.11%, of which the site condition A, B, C, 0-20cm soil layer in the proportion of less than 20-40cm, in addition to the root volume distribution, site condition B at 0-20 cm of the total 45.77% greater than 20-40cm of 45.17%, and site condition D is just the opposite.4. Study shows that different conditions of site under the bamboo stump shoot production capacity:one water bamboo shoots accounted for the largest proportion, averaged 82.25%, followed by two water bamboo shoot for an average of 15.41%, three water bamboo accounts for the smallest proportion is 2.34% on average, site condition A, B, C of one water shoot yield was lower than site condition D, vary in the range of 7.63-12.68%, the visible management compared to no artificial operation, more conducive to the two water and more high yield; there are three main conditions:vertical bamboo stump (YY), connected with bamboo stump (WY), not connected with bamboo stump (WW), in a bamboo stump la YY, the site condition B shoots produced the largest amount of 4.21 kg/a. in a bamboo stump YY 2a, the site condition C max bamboo shoot yield 1.53 kg/a, in a bamboo stump YY 3a, the site condition C max bamboo shoot yield 0.85 kg/a, and bamboo shoots stump WW production quantity not exceeded 1kg/months; bamboo stump WY producing bamboo shoots are protected by the influence of age is greater than the impact of their own ages.5. According to analysis of different site conditions of bamboo shoot quality:in the analysis of physical quality index analysis and index of nutrition, site conditions A, B, C are better than that of site condition D, which in the artificial management of site condition, site condition A shoot quality is superior to the conditions of site B and site condition C. |
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