毕业论文移动版

摘要硅是禾本科、莎草科等植物的必需元素，而对于其他植物来说硅的存在也有利于其生长。芦苇广泛分布在我国大部分地区，其具有重要的经济、生态学价值。本次试验选择芦苇作为研究对象，探讨其叶片内硅元素含量的地理分布格局及造成该分布格局的原因。结果显示芦苇叶片中累积了大量硅元素。中国芦苇叶片硅元素含量呈现一定的地理分布格局，具体表现为随着经度的增加而降低，随着纬度的增加而增加。究其原因是芦苇叶片硅元素含量与环境因子有着密不可分的关系，具体表现为：（1）随着年平均温度的升高先升高后降低；（2）随着年平均降水量的增加而降低；（3）随着年平均风速的增加而增加；（4）随着土壤有效硅含量的增加先缓慢降低后显著增加，但总体呈现显著增加的趋势。52873

毕业论文关键词：硅元素; 芦苇; 地理因子; 环境因子

Abstract Silicon is an essential element fou Gramineae and sedges, and for other plants  the presence of silicon is also beneficial to its growth. Reed widely distributed in most parts of China, which has important economic, ecological value. The test selection reed as objects to study the distribution pattern within the silicon element content of the leaves and the cause of the geographic distribution pattern. The results showed that reed leaves accumulate a large number of silicon element. Chinese reed blades silicon element content showed a certain geographic distribution patterns, the specific performance decreases with the increase of longitude, latitude and increases with increasing. The reason is that reed blades silicon element content and environmental factors have a close relationship, the specific performance: (1)With the increase of the average annual temperature rise After rising first down; (2)With the increase of the average annual precipitation decreases; (3)With the increase of the annual average wind speed increases; (4)With the significant increase after increase soil available silicon content decrease slowly at first, but the overall trend showed a significant increase.

Key words: Silicon element; reed; Geographical Factors; Environmental Factors 

目    录

1.前言 3

1.1芦苇 3

1.2硅 4

1.3研究内容 5

2.方法 5

2.1采样方法 5

2.2实验方法 6

2.2.1芦苇叶片硅含量的测定 6

2.2.2土壤有效硅的测定 6

2.3气候因子数据提取 7

3.结果 7

3.1芦苇叶片硅含量特征 7

3.2芦苇叶片硅含量与地理因子的关系 7

3.3芦苇叶片硅含量与环境因子的关系 8

3.3.1与温度因子的关系 9

3.3.2与降水的关系 11

3.3.3与土壤有效硅的关系 12

3.3.4与风速的关系 12

4.讨论 13

4.1 芦苇叶片中的硅含量 13

4.2 芦苇叶片硅含量与地理因子的关系 14

4.3芦苇叶片硅含量与环境因子的关系 14

5.总结 (责任编辑：qin)