外界因素对皖南毛竹地上生物量以及竹笋生长特性的影响

发布时间:2018-02-26 18:45

  本文关键词: 毛竹 生物量 竹笋 海拔 密度 土壤理化性质 出处:《安徽农业大学》2014年硕士论文 论文类型:学位论文


【摘要】:本文对皖南毛竹(phyllostachys edulis地上生物量以及竹笋生长特性在不同环境因素影响下的变化情况进行了研究,旨在为皖南毛竹生长发育和经营管理提供一定的理论指导。主要结论如下:(1)毛竹地上器官平均含水率排序为竹叶(54.52%)竹秆(43.36%)竹枝(34.95%);器官含水率具有随着年龄的加大而减小的趋势:不同年龄的毛竹竹叶生物量变异性较大,枝条和秆的生物量变异性较小;竹秆所占地上生物量比例最大,其次是竹枝,最小的是竹叶;皖南毛竹最优的异速生长关系模型为:lg w=a'+b 1g D+c 1g H。(2)不同海拔梯度下毛竹地上生物量存在显著的差异性,随着海拔的增加而呈现先“抛物线”型变化,H3海拔处毛竹地上生物量最大。随着密度的增加毛竹地上生物量逐渐加大。土壤化学性质中全P含量与毛竹地上生物量呈显著地正相关关系,其它化学性质与毛竹地上生物量之间关系效应不明显。(3)成竹数随着海拔的升高呈现“抛物线”型变化趋势,大小顺序为H3H2H1H4。皖南毛竹退笋率大小在40.47%~54.90%之间,且不同海拔区间退笋率差异不明显。随着海拔的升高皖南毛竹始发笋时间和出笋终止时间均向后推移,毛竹笋期持续天数随着海拔的升高逐渐减少。同海拔区间出笋盛期时间无显著差别,均为8天左右,毛竹出笋前期和出笋末期持续天数非常接近,均比出笋盛期时间长3-6天。皖南毛竹笋高生长期持续时间约为42~52天,并随着海拔的升高而逐渐增加。不同海拔区间毛竹笋高生长均呈现“S”型变化。四个不同海拔区间反映竹笋高度(h)和生长时间(d)两者关系最佳的曲线模型均为Logistic函数。笋地径和成竹高受海拔的影响效应较小。(4)皖南毛竹笋产量随着密度的增加呈现“抛物线”型变化趋势,产量最大值出现在4000株/hm2~4500株/hm2密度区间。随着密度的增加笋期持续时间和竹笋高生长持续时间逐渐增加,竹笋平均日生长量和最大日平均生长量均随密度的加大逐渐减小。竹笋地径与密度之间存在显著的负相关关系,但竹林密度对成竹高度的影响效应不显著。(5)皖南毛竹笋成竹数和成竹高度受土壤中各元素含量以及相关化学性质的影响效应较小。土壤中速效P含量与笋地径间存在显著的正相关关系,P0.01,关系较密切,其它土壤化学性质对笋地径的影响效应较小。
[Abstract]:The aboveground biomass of phyllostachys edulis and the variation of bamboo shoot growth characteristics under different environmental factors were studied in this paper. The main conclusions are as follows: 1) the average moisture content of the aboveground organs of Phyllostachys pubescens is ranked as 54.52) the bamboo stem is 43.36) and the bamboo branch is 34.9595%; the moisture content of the organs increases with the age of the bamboo organs. The main conclusions are as follows: 1) the average moisture content of the aboveground organs of Phyllostachys pubescens is in the order of 54.52). But the decreasing trend: the biomass variability of bamboo leaves in different ages was higher, The biomass variability of branches and culms was small, and the percentage of aboveground biomass of bamboo culms was the largest, followed by bamboo branches, and the smallest was bamboo leaves. The optimal allometric growth relationship model of bamboo in southern Anhui Province was: 1 g wangya'b 1g D c 1g H.f2) there was significant difference in aboveground biomass of Phyllostachys pubescens under different altitude gradients. The aboveground biomass of Phyllostachys pubescens increased with the increase of density, and the total P content in soil chemistry and the aboveground biomass of Phyllostachys pubescens were increased with the increase of altitude. There was a significant positive correlation between the quantity and the quantity. The relationship between other chemical properties and aboveground biomass of Phyllostachys pubescens was not obvious. With the increase of altitude, the time of bamboo shoot initiation and the end time of shoot shoot all moved backward, and there was no significant difference in the rate of bamboo shoot retrogression between different altitude regions, with the increase of altitude, the time of bamboo shoot beginning and ending. The days of bamboo shoot duration decreased gradually with the increase of altitude, but there was no significant difference between the periods of shoot emergence and peak at the same altitude, which were all about 8 days, and the days of early and late bamboo shoots were very close to each other. The duration of high growth period of bamboo shoots in southern Anhui Province was about 422 ~ 52 days, which was 3 ~ 6 days longer than that of bamboo shoots. With the increase of altitude, the height of Phyllostachys pubescens increased gradually. The growth of bamboo shoot height showed "S" type change at different altitudes. The best curve model of the relationship between the four different elevations reflected the height of bamboo shoot and the growth time was all Logistic's function. The effect of altitude on the diameter and height of bamboo shoot was small. (4) the bamboo shoot yield of southern Anhui showed a "parabola" pattern with the increase of density. The maximum yield appeared in the density range of 4000 plants / hm ~ 2 / hm ~ 2 / hm ~ 2 / hm ~ 2. With the increase of density, the duration of shoot period and the growth duration of bamboo shoot height increased gradually. The average daily growth of bamboo shoots and the maximum daily average growth of bamboo shoots gradually decreased with the increase of density, and there was a significant negative correlation between the diameter of bamboo shoots and the density of bamboo shoots. However, the effect of bamboo density on bamboo height is not significant. (5) the bamboo number and height of bamboo shoots in southern Anhui are less affected by the content of soil elements and the relative chemical properties. There was a significant positive correlation (P0.01), and the relationship was close. Other soil chemical properties have little effect on the diameter of bamboo shoot.
【学位授予单位】:安徽农业大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:S795.7

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1 国振杰;易津;张力君;陈锋;侯晓东;;海拔高度对羊草生物量和根茎形态可塑性的影响[J];干旱区资源与环境;2008年04期



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