三种生物炭对石灰性土壤的性质及刺槐幼苗生长的影响机制毕业论文_生态学毕业论文

三种生物炭对石灰性土壤的性质及刺槐幼苗生长的影响机制毕业论文

2021-04-27更新

摘 要

本研究采用盆栽试验,研究了不同种类生物炭(添加质量比为5%)及其与粉碎秸秆混施(添加质量比为1%)对喀斯特山地土壤结构、水分特征和刺槐幼苗生长的影响,为改良喀斯特山地退化土壤性质、提高森林植被恢复生态效益提供参考。主要研究结果如下:

(1)研究了生物炭与秸秆混施对喀斯特山地土壤结构的影响效果。结果表明,不同处理均可降低土壤容重,增加孔隙度,但影响不显著;稻壳炭(B1D5)和木炭(B3D5)均能显著促进大团聚体(>0.25mm)的形成,而添加秸秆(S)的各处理更能显著提高大团聚体含量且降低微团聚体(<0.25mm)含量,从而提高土壤团聚体稳定性,增强土壤抗侵蚀能力;

(2)研究了生物炭与秸秆混施对喀斯特山地土壤水分特性的影响效果。结果表明,不同处理均能提高土壤持水能力,但未达显著水平;生物炭施用对土壤饱和导水率的影响不显著,添加秸秆(S)或与木炭混施(SB3D5)可显著降低土壤饱和导水率,这有利于喀斯特山地降水的表层截留,促进作物生长;

(3)研究了生物炭与秸秆混施对刺槐幼苗生长和生理特性的影响。结果表明,不同处理对刺槐幼苗的生长特性(株高、地径、生物量等)均有促进作用,但未达到显著水平;三种生物炭对叶绿素含量均有促进作用,而与秸秆混施后则会产生明显的抑制作用;三种生物炭对根系活力均有抑制作用,而与秸秆混施后则会产生促进作用,但未达显著水平。

研究表明,添加不同种类生物炭对喀斯特山地土壤性质均产生不同程度影响,但对刺槐幼苗生长影响不显著。综合分析可知,木炭与秸秆混施(SB3D5)对土壤结构改善、减少水分深层入渗损失和促进刺槐幼苗生长效果最好。由于本文测定时间较短,生物炭对土壤和植物的影响尚未稳定,需建立长期监测体系深入研究其作用和影响过程。

关键词:生物炭;秸秆;土壤特性;刺槐幼苗生长;喀斯特山地

Effects of biochar combined comminuted straw application on soil improvement and growth of Robinia pseudoacacia on the Karst mountain

ABSTRACT

In this study, three types of biochar (mass ratio of biochar to soil 5%) and comminuted straw (mass ratio of straw to soil 1%) were chosen as the test materials for pot experiments. Soil structure, soil water properties and growth indexes of Robinia pseudoacacia were investigate in time of young seedling. The objectives of our study was improving the Karst mountain typical soils The main research findings are shown as follows:

(1) Effects of biochar combined comminuted straw application on soil bulk density and soil aggregates were determinated. Biochar application showed the trend to decrease the soil bulk density and increase the porosity, but not significantly. Rice husk biochar and woodchips biochar application significantly promoted the formation of the soil big aggregates(>0.25mm) distribution, while straw more significantly promoted the formation of the soil big aggreagates(>0.25mm)distribution, but decreased the formation of the soil micro-aggregates(<0.25mm)in the dry-wet sieving. However, straw and biochar combined straw application showed the more improvement effect on soil aggregates stability and anti-erosion ability.

(2) Effects of biochar comminuted straw application on soil water properties were determinated. All treatments application increased the soil water hold capacity, but not significantly, and only comminuted straw(S), rice husk biochar(B1D5)and woodchips biochar decreased saturated hydraulic conductivity, which will benefit to store the rainfall in the surface layer and supply the plant growth.

(2) Effects of biochar comminuted straw application on growth of Robinia pseudoacacia were determinated. All treatments application promoted early growth characteristics, but not significantly; three types of biochar all increased the content of chlorophyll but drepressed the root activity, while combined with straw, the application contributed to root activity insignificantly.

From the study, we found that all treatments appliation have the better improvement effect on the Karst mountain soil, but little effect on early growth of Robinia pseudoacacia. After analysis of comprehensive factor, woodchips biochar combined straw(SB3D5) had the tendency to get better improvement effect on soil structure, hydraulic conductivity and early growth of Robinia pseudoacacia. However, in the relatively short experiment period, biochar application didn’t show the steady improvement effect. Long period montoring system should be set up to assess the influence process and comprehensively assess biochar application effects on soil properties and growth of plants.

Key Words:Biochar;Straw; Soil property; Early growth of Robinia pseudoacacia; Karst mountain

目 录

1 绪论 – 1 –

1.1 研究背景及意义 – 1 –

1.2 国内外研究进展 – 2 –

1.2.1 生物炭的基本特性 – 2 –

1.2.2 生物炭对土壤性质的影响研究 – 4 –

1.2.3 生物炭对植物生长的影响研究 – 6 –

1.2.4 生物炭与土壤及植物的相互作用机制 – 6 –

2 研究内容与研究方法 – 8 –

2.1 研究目的 – 8 –

2.2 研究内容 – 8 –

2.3 研究方法 – 8 –

2.3.1 试验材料 – 8 –

2.3.2 实验设计 – 9 –

2.3.3 取样时间及方法 – 10 –

2.3.4 数据处理 – 12 –

2.4 技术路线 – 12 –

3 结果与分析 – 14 –

3.1 不同种类生物炭与秸秆混施对土壤结构及稳定性影响 – 14 –

3.1.1 土壤容重和孔隙度 – 14 –

3.1.2 土壤水稳性团聚组成和稳定性 – 15 –

3.1.3 小结. – 17 –

3.2 生物炭与秸秆混施对土壤水分特性的影响 – 18 –

3.2.1 土壤持水能力 – 18 –

3.2.2 饱和导水率 – 19 –

3.2.3 小结 – 19 –

3.3 生物炭与秸秆混施对刺槐幼苗生长的影响 – 20 –

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

推荐链接