混生竹林地下结构毕业论文_林学毕业论文

混生竹林地下结构毕业论文

2021-04-20更新

摘 要

混生竹兼有散生竹和丛生竹的结构特征,但研究甚少。江苏产茶秆竹是周芳纯先生1974年引种到江苏的一种具有重要经济、生态和社会价值的混生类型竹种。近50年的生长表现表明,茶秆竹北引江苏,生长优良,安全越冬,引种成功。但对其在江苏的生长表现没有研究数据报道。遂对江苏句容下蜀林场、江都大禹竹园的茶秆竹林分进行地上、地下竹林结构调查。

下蜀、大禹两地产茶秆竹的株高、冠幅、节长、节数、枝盘数、秆壁厚度、生物量等结构因子差异不显著。株高4.67m-5.10m,均高4.87m;地径3.50-5.70cm,平均4.50cm;胸径1.20cm-1.90cm,平均1.60cm;节长20.5cm-22.0cm,均长21.2cm,节位数第八节最长,达27.2cm;两地茶秆竹根平均23节,一般20节-27节;秆壁厚度2.7mm-2.9mm,平均3.0cm,最厚3.3cm;每hm2生物量(干重)120980.8kg-135460.8kg较原产地广东广宁的茶秆竹略小。

两地茶秆竹的秆粗、胸径、地径、枝下高差异显著,可能是因为大禹竹园2007年才从南京引种,且为园林苗圃,其取苗量大、经营强度高,植株偏小;而下蜀茶秆竹林引种时间早,已经逸为野生状态,其秆更粗,枝下高更长,枝盘数更多。

首次测定、分析了包括混生结构的茶秆竹地下部分结构性状。茶秆竹地下秆基有5节-7节,长6.60cm-12.60cm,均长9.60cm;粗度1.5mm-14.4mm,均值7.6mm。秆柄无芽无根,只要少许膜状包裹物的假鞭长1.02cm-1.98cm,平均1.38cm,链接于竹鞭(地下茎)。竹鞭长2.6cm/鞭节-4.2cm/鞭节,平均3.9cm;蔸根数19根/节-36根/节,平均21根;鞭根数27-45根/鞭节,平均37根。其中,秆基长、 秆基粗度、蔸根数量、鞭根数量两地差异显著,秆基节数、秆柄(假鞭)节数及总长差异不显著。下蜀较大禹的茶秆竹竹蔸表现得更大/粗/长,但两地的假鞭长度、节数似乎不受竹秆性状的影响。

关键词:江苏;茶秆竹混生结构;地上结构;地下结构

Study on the structure of mixed bamboo.

Take the structure of bamboo in jiangsu province as an example

ABSTRACT

Mixed bamboo has both the structural characteristics of loose bamboo and tufted bamboo, but little research has been done. Tea straw bamboo is a kind of mixed bamboo with important economic, ecological and social value introduced by Mr. Zhou fangchun to jiangsu province in 1974. The growth performance in the past 50 years indicates that the tea culm and bamboo have been successfully introduced into jiangsu province in the north, with good growth, safe wintering and successful introduction. However, no data have been reported on its growth performance in jiangsu province. Therefore, the structure of the above-ground and underground bamboo forests was investigated for the tea culm and bamboo groves in the shu forest farm and the dayu bamboo garden of jiangdu in jiangsu province.

There was no significant difference in plant height, canopy width, node length, number of nodes, number of branches, thickness of culm wall, biomass and other structural factors between lower shu and dayu. The plant height was 4.67-5.10m, both of which were 4.87m. The ground diameter was 3.50-5.70cm, with an average of 4.50cm. Chest diameter: 1.20-1.90cm, average: 1.60cm; Section length: 20.5-22.0cm, both 21.2cm, section number: the 8th section is the longest, up to 27.2cm. The average tea straw and bamboo root in two places is 23 knots, 20-27 knots. Culm wall thickness 2.7-2.9mm, mean 3.0cm, maximum 3.3cm; The hm2 (dry weight) is 120980.8kg-135460.8kg, which is slightly smaller than the tea culm bamboo of guangning, guangdong.

Both tea stalk bamboo stem thick, significant difference was found in diameter at breast height, under branch height, ground diameter, probably because dayu w, introduced in 2007 from nanjing, and as the garden nursery, its take large amount of seedling, high strength, small plants; However, the lower shu tea stalk bamboo forest was introduced early and has been in the wild state.

For the first time, the underground structural characters of tea culm bamboo including hybrid structure were determined and analyzed. The underground culm base of tea culms and bamboo has 5-7 sections, with a length of 6.60-12.60cm and a length of 9.60cm. Thickness 1.5-14.4mm, mean value 7.6mm. Stalks without buds or roots, as long as a few membranous inclusions of the false whip length 1.02-1.98cm, average 1.38cm, linked to the bamboo whip (underground stem). The length of bamboo whip was 2.6-4.2cm/ penis, with an average length of 3.9cm. Contend number 19-36 root/node, average 21 root; The number of whips was 27 to 45, with an average of 37. Among them, Culm base length, There were significant differences in root thickness, stump number and whip number, but no significant differences in root number, stalk number and total length. Compared with dayu’s bamboo stump, the bamboo stump in lower shu was larger/thicker/longer, but the length and number of false whip in both places seemed not affected by the character of bamboo stalk.

Key words:Jiangsu; Pseudosasa amabilis; Mixed bamboo; The ground; underground

以上是资料介绍,完整资料请联系客服购买,微信号:bysjorg 、QQ号:3236353895

群聊信息

  • 还没有任何群聊信息,你来说两句吧
  • 发表评论


推荐链接