Effect of Wheat Straw and Its Biochar Addition on Surface Electrochemical Characteristics of Loessal Soil

TU Kun; HU Feinan; XU Chenyang; MA Rentian; LIU Jingfang; LIU Zhe; SONG Songsong; WANG Jinxiao

doi:10.13870/j.cnki.stbcxb.2022.01.046

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Effect of Wheat Straw and Its Biochar Addition on Surface Electrochemical Characteristics of Loessal Soil

更新时间：2025-03-12

- Effect of Wheat Straw and Its Biochar Addition on Surface Electrochemical Characteristics of Loessal Soil
- Vol. 36, Issue 1, Pages: 360-367(2022)
- 作者机构：
  
  1. 西北农林科技大学资源环境学院, 陕西杨凌,712100
  2. 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌,陕西,712100
  3. 陕西地建土地工程技术研究院有限责任公司,西安,710000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.01.046
  CLC： S153.2
- Published：2022
- 稿件说明：
移动端阅览
TU Kun, HU Feinan, XU Chenyang, et al. Effect of Wheat Straw and Its Biochar Addition on Surface Electrochemical Characteristics of Loessal Soil[J]. 2022, 36(1): 360-367.
DOI：

TU Kun, HU Feinan, XU Chenyang, et al. Effect of Wheat Straw and Its Biochar Addition on Surface Electrochemical Characteristics of Loessal Soil[J]. 2022, 36(1): 360-367. DOI： 10.13870/j.cnki.stbcxb.2022.01.046.

摘要

土壤表面电化学性质是土壤具有肥力的重要基础

研究小麦秸秆及其生物炭添加对黄绵土表面电化学性质的影响

可为黄绵土耕地质量的提升及可持续利用、减少土壤侵蚀提供重要的理论及实践依据。通过室内恒温培养试验

设置对照(CK)、1%秸秆(J1)、3%秸秆(J3)、5%秸秆(J5)、7%秸秆(J7)、10%秸秆(J10)和1%生物炭(S1)、3%生物炭(S3)、5%生物炭(S5)、7%生物炭(S7)、10%生物炭(S10)11个处理。培养10个月后采集土壤样品

采用物质表面性质联合测定法测定表面电化学参数

包括表面电荷数量(SCN)、比表面积(SSA)、表面电荷密度(σ0)、表面电位(φ0)、表面电场强度(E0)

并通过冗余分析的方法解析了表面电化学性质与土壤基本理化性质之间的关系。结果表明: (1)施用秸秆和生物炭后

土壤碳酸盐含量下降

有机碳(SOC)、电导率、全氮(TN)及碳氮比(C/N)增加。添加秸秆会降低黄绵土的pH

而生物炭则会增加土壤的pH。(2)随着秸秆施用量的增加

Zeta电位下降

施用生物炭后

各个处理的Zeta电位都小于CK

但总体上随生物炭施用量的增加Zeta电位增加。(3)随着秸秆和生物炭施用量的增加

土壤的比表面积(SSA)和表面电荷数量(SCN)均增大。与CK相比

J10和S10的SSA分别提高114.0%和98.1%

SCN提高80.8%和88.3%。施用秸秆能够降低土壤表面电荷密度(σ0)

与CK相比

施用秸秆的土壤σ0降低幅度可达5.5%~15.5%。总体上

随生物炭施用量的增加σ0减小

当添加量超过5%后

施用生物炭土壤的σ0小于CK。(4)冗余分析结果显示

有机碳是影响土壤表面电化学性质的最主要因素

其解释量在秸秆和生物炭添加处理中分别占88.1%和89.5%。施用秸秆和生物炭会显著提高黄绵土的有机碳含量

改善土壤基本理化性质。土壤的比表面积和表面电荷数量随秸秆和生物炭添加量的增加而增加

但表面电荷密度总体上呈下降趋势。有机碳含量是影响黄绵土表面电化学性质变化的主控因素。

Abstract

Soil surface electrochemical characteristics are important basis for soil fertility. Studies on the effect of wheat straw and its biochar addition on the soil surface electrochemical properties can provide important theoretical and practical basis for improving the quality of cultivated land

sustainable utilization and reducing soil erosion. Through indoor constant temperature culture experiment

11 treatments were set up: control (CK)

1% straw (J1)

3% straw (J3)

5% straw (J5)

7% straw (J7)

10% straw (J10)

1% biochar (S1)

3% biochar (S3)

5% biochar (S5)

7% biochar (S7)

10% biochar (S10). Soil samples were collected after 10 months

then determined for surface electrochemical parameters by the method of combined analysis of surface properties

including surface charge number (SCN)

specific surface area (SSA) and surface charge density(σ0)

surface potential (φ0)

and surface electric field intensity (E0). The relationships between surface electrochemical properties and soil physical and chemical properties were analyzed by redundancy analysis. The results showed that: (1) After applying straw and biochar

soil carbonate content decreased

while soil organic carbon (SOC)

electrical conductivity

total nitrogen (TN) and carbon nitrogen ratio (C/N) increased. The addition of straw could reduce the pH of loessal soil

while increase the pH. (2) With the increase of straw application rates

Zeta potential decreased. After applying biochar

Zeta potential of each treatment was lower than that of CK

but Zeta potential increased with the increase of biochar application rates in general. (3) The SSA and SCN of soils increased with the increase of straw and biochar application rates. Compared with CK

the SSA of J10 and S10 increased by 114.0% and 98.1%; and SCN of J10 and S10 increased by 80.8% and 88.3%

respectively. Application of straw could reduce the surface charge density of soils. The σ0 for straw-added soils was reduced by 5.5%~15.5% compared with that in CK. A small amount of biochar application could increase soil σ0 compared with that in CK. On the whole

the σ0 decreased with the increase of biochar application rates. When the amount of biochar was more than 5%

σ0 for biochar-added soils was less than CK. (4) The results of redundancy analysis showed that SOC was the most important factor affecting the soil surface electrochemical properties and the explained amounts were 88.1% and 89.5% for straw and biochar addition

respectively. The application of straw and biochar could significantly increase the content of organic carbon and improve the basic physical and chemical properties of the Loessal soil. The SSA and SCN of soils increased while the surface charge density decreased with the increase of straw and biochar application rates. The content of organic carbon was the main controlling factor of the surface electrochemical properties.

关键词

Keywords

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