青藏高原緯度梯度下紫花針茅種子大小適應(yīng)性的初步研究_畢業(yè)論文(已修改)
2025-09-06 18:52 本頁(yè)面
【正文】 西南林業(yè)大學(xué) 本科畢業(yè)（設(shè)計(jì)）論文 （ 2020屆） 題目 :青藏高原緯度梯度下紫花針茅種子大小適應(yīng)性的初步研究 教學(xué)院系 環(huán)境科學(xué)與工程學(xué)院 專 業(yè) 環(huán)境科學(xué) 學(xué)生姓名 刁開(kāi)佑 指導(dǎo)教師 劉文勝 評(píng) 閱 人 齊丹卉（講 師） 2020 年 5 月 10 日 青藏高原緯度梯度下紫花針茅種子大小適應(yīng)性的初步研究 刁開(kāi)佑 （西南林業(yè)大學(xué)環(huán)境科學(xué)與工程學(xué)院，云南 昆明 650224） 摘要 ：紫花針茅（ Stipa purpurea）是青藏高原上一種分布較為 廣泛、對(duì)惡劣環(huán)境抵抗能力較強(qiáng)、適應(yīng)性較高的植物。但由于近年來(lái)環(huán)境狀況日趨惡劣、氣候變暖等因素其生長(zhǎng)受到了較大的影響。為了了解紫花針茅對(duì)水熱等環(huán)境條件的適應(yīng)，本文通過(guò)對(duì)紫花針茅種子隨景觀變化以及紫花針茅與各指標(biāo)間的權(quán)衡關(guān)系進(jìn)行研究。結(jié)果表明：①種子直徑隨著緯度的增加而增加，說(shuō)明大種子在水熱條件較差時(shí)有較好的適應(yīng)性；芒長(zhǎng)隨著緯度的增加而增加，說(shuō)明芒長(zhǎng)的增加有利于種子的傳播及能促進(jìn)種子的萌發(fā)；第二節(jié)間直徑隨著緯度的增加而增加，說(shuō)明第二節(jié)間直徑長(zhǎng)得越健壯越有利于穗的生長(zhǎng)。穗長(zhǎng)隨著海拔的升高而減小，說(shuō)明海拔較高的區(qū)域 較低矮的穗有更強(qiáng)的適應(yīng)性；種子數(shù)量隨著海拔的升高而減小，說(shuō)明高海拔區(qū)環(huán)境惡劣植株生長(zhǎng)狀況而導(dǎo)致差結(jié)實(shí)率低。種子各指標(biāo)與經(jīng)度的變化均無(wú)關(guān)系。②種子直徑隨著第二節(jié)間直徑的增大而增大，種子總重量隨種子直徑的增加而增大；外稃長(zhǎng)、芒長(zhǎng)、內(nèi)稃長(zhǎng)、種子總重量隨著種子長(zhǎng)的增加而增加。 關(guān)鍵詞 ：青藏高原；紫花針茅；種子大小；芒長(zhǎng) QinghaiTibet Plateau latitudinal gradient Stipa purpurea a preliminary study of seed size adaptation Diao Kaiyou (College of Environmental Science and Engineering, Southwest Forestry University, Kunming 650224, China) Abstract: Stipa purpurea is a distribution on the QinghaiTibet Plateau is more widespread, strong resistance to harsh environments, adaptability higher plants. However, due to deteriorating environmental conditions in recent years, the growth factors such as climate change has been seriously affected. In order to understand in this case Stipa purpurea grandis adaptation, namely the Stipa purpurea grandis species to habitat choice, seed propagation and reproductive rule. This article through to Stipa purpurea grandis seeds with landscape changes and Stipa purpurea grandis and the relationship between each index research and analysis. The results showed that: ① The seed diameter increases with latitude, indicating that large seeds in hot water when the less the better adaptability。 Mountain long as the latitude increases, indicating that the increase is conducive to longMount seeds transmission and can promote seed germination。 II between the diameter increases with latitude, section II looks more robust between the diameter of the better ear growth. Ear length decreases with increasing altitude, indicating higher altitude than the low spike region have a wider tolerance。 number of seeds decreases with increasing altitude, indicating a poor environment of high altitude plant growth conditions led to poor seed set rate. Seeds of change in the index had no relationship with longitude. ② Section between seed diameter with the increase in diameter, the total weight of the seed with the increase of the seed diameter。 lemma length, awn length, palea length, total weight of seeds increased with seed length increased. Key words: QinghaiTibet Plateau。 Stipa purpurea。 Seed size。 Long mountai 目錄 1 前言 ............................................................................................................................ 1 研究的目的意義 ............................................................................................ 1 國(guó)內(nèi)外研究現(xiàn)狀 ............................................................................................ 1 2 材料與方法 ................................................................................................................ 5 實(shí)驗(yàn)材料來(lái)源 ................................................................................................ 5 研究方法 ........................................................................................................ 5 3 研究區(qū)概況 ................................................................................................................ 7 4 結(jié)果與分析 ................................................................................................................ 8 種子隨景觀的變化 ......................................................................................... 8 紫花針茅種子各指標(biāo)隨緯度的變化 ................................................. 8 紫花針茅種子各指標(biāo)隨經(jīng)
公司管理相關(guān)推薦
鄂ICP備17016276號(hào)-1