外掺料对植被混凝土高羊茅根系生长及抗剪强度的作用

李双洋; 陈芳清; 熊丹伟

doi:10.12153/j.issn.1674-991X.20220657

外掺料对植被混凝土高羊茅根系生长及抗剪强度的作用

doi: 10.12153/j.issn.1674-991X.20220657

李双洋^{1, 2,},
陈芳清^{1, 2, ,},
熊丹伟^{1, 2}

1.
三峡大学生物与制药学院
2.
湖北省三峡地区生态保护与治理国际联合研究中心

基金项目: 国家重点研发计划项目（2017YFC0504904-02）

详细信息

作者简介:
李双洋（1997—），男，硕士研究生，主要研究方向为修复生态学，1033662684@qq.com

通讯作者:
陈芳清（1963—），男，教授，主要从事保护生态学和恢复生态学研究，fqchen@ctgu.cn

中图分类号: Q948.1
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- 文章访问数: 322
- HTML全文浏览量: 195
- PDF下载量: 17
- 被引次数: 0
出版历程
- 收稿日期: 2022-06-25
- 录用日期: 2022-10-13
- 修回日期: 2022-08-02

Effect of external admixtures on the growth and shear strength of Festuca arundinacea roots in vegetated concrete

LI Shuangyang^{1, 2
,},
CHEN Fangqing^{1, 2
, ,},
XIONG Danwei^{1, 2}

1.
College of Biology and Pharmacy, China Three Gorges University
2.
Hubei International Scientific and Technological Cooperation Center of Ecological Conservation and Management in the Three Gorges Area

摘要

摘要:
为揭示外掺料对植被混凝土根系生长和固土护坡的作用，以高羊茅（Festuca arundinacea）为研究材料，分别添加不同含量的椰纤维与粉煤灰构建植被混凝土，测定高羊茅地下部根系的生长特征及根土复合体的抗剪强度。结果表明，椰纤维掺量和粉煤灰掺量对高羊茅根系生长有显著影响。根系总根长、根系表面积、根平均直径及地下生物量均随椰纤维与粉煤灰掺量的增加呈先增后减的变化趋势，在椰纤维掺量为0.3%、粉煤灰掺量为2%时达到最大值，分别比未添加椰纤维的处理增加了31.39%、30.20%、30.57%、12.80%，分别比未添加粉煤灰的处理增加了42.17%、22.85%、16.48%、29.22%。椰纤维掺量和粉煤灰掺量对植被混凝土基材的抗剪强度也有显著影响，基材的抗剪强度均随着外掺量增加呈先增加后减少的变化，在椰纤维和粉煤灰掺量分别为0.3%和2%时达到最大值。综合评估显示，高羊茅根系在外掺椰纤维0.3%和粉煤灰2%的改良植被混凝土生长最好，植被混凝土的抗剪强度最高。
- 植被混凝土 /
- 椰纤维 /
- 粉煤灰 /
- 根系特征 /
- 抗剪强度
Abstract:
In order to reveal the effects of external admixtures on the root growth and soil consolidation and slope protection of vegetation concrete, Festuca arundinacea was used as the research material, and different contents of coconut fiber and fly ash were added to construct vegetation concrete to measure the growth characteristics of Festuca arundinacea underground root system and the shear strength of root-soil complex. The results showed that the content of coconut fiber and fly ash had significant effects on the growth of Festuca arundinacea root system. The total root length, root surface area, root average diameter and underground biomass all increased first and then decreased with the increase of the content of coconut fiber and fly ash. When the content of coconut fiber was 0.3% and the content of fly ash was 2%, they reached the maximum value, which increased by 31.39%, 30.20%, 30.57% and 12.80%, respectively, compared with the treatment without coconut fiber. Compared with the treatment without fly ash, they increased by 42.17%, 22.85%, 16.48% and 29.22%, respectively. The coconut fiber content and fly ash content also had significant effects on the shear strength of the vegetated concrete substrate. The shear strength of the substrate increased first and then decreased with the increase of the addition content, and reached the maximum value when the content of coconut fiber and fly ash was 0.3% and 2%, respectively. The comprehensive evaluation showed that the improved vegetation concrete with Festuca arundinacea root system mixed with 0.3% of coconut fiber and 2% of fly ash had the best growth, and the shear strength of vegetation concrete was the highest.
- vegetation concrete /
- coconut fiber /
- fly ash /
- root characteristics /
- shearing strength

HTML全文

图 1 椰纤维掺量对植物根系生长的作用

注：小写字母表示各处理之间的差异性，字母不同表示各处理在0.05水平下差异显著。全文同。

Figure 1. Effects of coconut fiber content on plant root growth

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图 2 粉煤灰掺量对植物根系生长的作用

Figure 2. Effects of fly ash content on plant root growth

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图 3 椰纤维掺量对植被混凝土抗剪强度的作用

Figure 3. Effect of coconut fiber content on shear strength of vegetated concrete

下载: 全尺寸图片幻灯片

图 4 粉煤灰掺量对植被混凝土抗剪强度的作用

Figure 4. Effect of fly ash content on shear strength of vegetated concrete

下载: 全尺寸图片幻灯片

表 1 植被混凝土基层各组分质量配比

Table 1. Mass ratio of each component of vegetated concrete base g　

处理组	种植土	水泥	有机物料	绿化添加剂	粉煤灰	椰纤维
F0Y0	100	8	6	4	0	0
F0Y2	100	8	6	4	0	0.2
F0Y3	100	8	6	4	0	0.3
F0Y4	100	8	6	4	0	0.4
F1Y0	100	8	6	4	1	0
F1Y2	100	8	6	4	1	0.2
F1Y3	100	8	6	4	1	0.3
F1Y4	100	8	6	4	1	0.4
F2Y0	100	8	6	4	2	0
F2Y2	100	8	6	4	2	0.2
F2Y3	100	8	6	4	2	0.3
F2Y4	100	8	6	4	2	0.4
F3Y0	100	8	6	4	3	0
F3Y2	100	8	6	4	3	0.2
F3Y3	100	8	6	4	3	0.3
F3Y4	100	8	6	4	3	0.4
注：表中为植被混凝土基层各组分质量配比，各组分以干土质量为参照。

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表 2 外掺料对植物根系生长作用的多因素方差分析

Table 2. Multi-factor variance analysis of the effect of admixtures on plant root growth

方差来源		自由度	均方	F	P
椰纤维	根系长度	3	99471.96	85.74	0.00
	根系表面积	3	4186.77	57.09	0.00
	根系平均直径	3	0.76	182.31	0.00
	地下生物量	3	43885.15	1599.17	0.00
粉煤灰	根系长度	3	117100.17	100.93	0.00
	根系表面积	3	1205.52	16.44	0.00
	根系平均直径	3	0.18	42.24	0.00
	地下生物量	3	403.84	89.48	0.00
椰纤维和粉煤灰	根系长度	9	6635.17	5.72	0.00
	根系表面积	9	190.70	2.60	0.00
	根系平均直径	9	0.03	7.89	0.00
	地下生物量	9	33.54	7.43	0.00

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表 3 外掺料对植被混凝土抗剪强度作用的多因子方差分析

Table 3. Multi-factor variance analysis of the effect of admixture on shear strength of vegetated concrete

方差来源		自由度	均方	F	P
	上层抗剪强度	3	1559.18	126.73	0.00
椰纤维	中层抗剪强度	3	6716.73	704.91	0.00
	下层抗剪强度	3	3552.34	355.13	0.00
	整体抗剪强度	3	3542.63	784.91	0.00
粉煤灰	上层抗剪强度	3	578.46	47.02	0.00
	中层抗剪强度	3	542.75	56.96	0.00
	下层抗剪强度	3	343.13	34.30	0.00
	整体抗剪强度	3	403.84	89.48	0.00
椰纤维和粉煤灰	上层抗剪强度	9	44.28	3.60	0.00
	中层抗剪强度	9	68.00	7.14	0.00
	下层抗剪强度	9	49.69	4.97	0.00
	整体抗剪强度	9	33.54	7.43	0.00

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表 4 主成分分析载荷矩阵及贡献率

Table 4. Principal component analysis load matrix and contribution rate

指标	第一主成分	第二主成分
中层抗剪强度	0.945	−0.245
整体抗剪强度	0.942	−0.329
根系平均直径	0.931	0.103
下层抗剪强度	0.914	−0.278
根系表面积	0.876	0.316
根系长度	0.857	0.443
上层抗剪强度	0.812	−0.487
地下生物量	0.786	0.558
特征值	6.261	1.101
主成分贡献率/%	78.261	13.763
累计贡献率/%	78.261	92.024

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表 5 处理组合排位前5的主成分得分

Table 5. Principal component scores of top 5 treatment combinations

处理	第一主成分		第二主成分		综合
处理	得分	排名	得分	排名	得分	排名
F2Y3	4.83	1	0.35	7	3.82	1
F1Y3	2.91	2	−0.73	11	2.97	2
F2Y2	2.40	3	0.81	8	2.10	3
F3Y3	2.22	4	−0.14	5	2.07	4
F1Y2	1.55	5	−0.64	9	1.54	5

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