Stability and Fractal Features of Soil Aggregate in Irrigated Farmland Under Biochar Application

YANG Weijun; HUI Chao; CHEN Yuxin; SONG Shilong; YANG Mei; GUO Song

doi:10.13870/j.cnki.stbcxb.2022.06.039

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Stability and Fractal Features of Soil Aggregate in Irrigated Farmland Under Biochar Application

更新时间：2025-03-12

- Stability and Fractal Features of Soil Aggregate in Irrigated Farmland Under Biochar Application
- Vol. 36, Issue 6, Pages: 323-329(2022)
- 作者机构：
  
  新疆农业大学农学院,乌鲁木齐,830052
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.06.039
  CLC： S152.4
- Published：2022
- 稿件说明：
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YANG Weijun, HUI Chao, CHEN Yuxin, et al. Stability and Fractal Features of Soil Aggregate in Irrigated Farmland Under Biochar Application[J]. 2022, 36(6): 323-329.
DOI：

YANG Weijun, HUI Chao, CHEN Yuxin, et al. Stability and Fractal Features of Soil Aggregate in Irrigated Farmland Under Biochar Application[J]. 2022, 36(6): 323-329. DOI： 10.13870/j.cnki.stbcxb.2022.06.039.

摘要

试验研究了不同筛分方法下生物质炭施用对土壤团聚体的影响

为生物质炭农业利用提供理论依据。设置生物质炭用量4个水平(0

30 t/hm2)

氮肥用量2个水平(0

150 kg/hm2)

通过2年田间定位试验

测定分析干筛法和湿筛法0—30 cm土层土壤团聚体分布及稳定性。结果表明:2种筛分方式下

不同处理各粒级土壤团聚体分布趋势基本一致

干筛法所得机械土壤团聚体主要以＞5

2~5 0.5~1 mm粒级为主

而湿筛法水稳性团聚体均以0.25~0.5 mm及＜0.25 mm为主;不同处理干筛法土壤团聚体平均重量直径(MWD)、几何平均直径(GMD)均高于湿筛法。湿筛法下各处理

无论施氮与否

MWD、GMD均随生物质炭量增加而增大。其中

B0N0处理MWD、GMD最小

单施生物质炭B3N0处理土壤团聚体直径最大

分别较B0N0显著提高60%(MWD)和52%(GMD);各处理土壤团聚体破坏率(PAD)随生物质炭量增加而减小

土壤团聚体稳定率(WASR)则随生物质炭量增加呈上升趋势;干筛法各处理分形维数(D)均低于湿筛法

随生物质炭量增加D值不断降低

B3生物质炭量下分形维数最低

分别为2.63(B3N0)和2.64(B3N1)

分别较对照降低3.3%和2.9%;分形维数(D)与＞0.25 mm土壤团聚体含量(R＞0.25)呈显著负相关关系。试验条件下

生物质炭添加量为30 t/hm2时土壤团聚体稳定性最佳。同时

湿筛法较干筛法能更好地模拟大田环境

真实反映土壤团聚体分布及其稳定性。

Abstract

The effects of biochar application on soil aggregates under different sieving methods were studied experimentally to provide a theoretical basis for the agricultural utilization of biochar. Four levels of biochar dosage (0

20 and 30 t/hm2) and two levels of nitrogen fertilizer dosage (0 and 150 kg/hm2) were set up in the experiment. Through two-year field positioning test

the distribution and stability of soil aggregates in 0—30 cm soil layer were measured and analyzed by dry sieving method and wet sieving method. The results showed that under the two sieving methods

the distribution trends of soil aggregates of each particle size in different treatments were basically the same. The mechanical soil aggregates obtained by the dry sieving method were mainly of ＞5 mm

2~5 mm and 0.5~1 mm

while the water-stable aggregates obtained by the wet sieving method were mainly of 0.25~0.5 mm and ＜0.25 mm. The mean weight diameter (MWD) and geometric mean diameter (GMD) of soil aggregates in the dry sieving method were higher than those in the wet sieving method. In all treatments under wet sieving method

whether nitrogen was applied or not

both MWD and GMD increased with the increasing of biochar content. Among them

the MWD and GMD of the B0N0 treatment were the smallest

and the diameter of the soil aggregates in B3N0 (single application of biochar) was the largest

which was significantly higher than that of B0N0 by 60% (MWD) and 52% (GMD)

respectively. The soil aggregate destruction rate (PAD) decreased with the increasing of biochar amount

while the soil aggregate stability rate (WASR) increased with the increasing of biochar amount. The fractal dimension (D) of each treatment in the dry sieving method was lower than that in the wet sieving method. The D value decreased continuously with the increasing of the biochar amount

and the fractal dimension of B3 biochar was the lowest

which were 2.63 (B3N0) and 2.64 (B3N1)

respectively

3.3% and 2.9% lower than that of the control. There was a significant negative correlation between the fractal dimension (D) and the content of soil aggregate larger than 0.25 mm (R＞0.25). Under the experimental conditions

the soil aggregate stability was the best when the amount of biochar was 30 t/hm2. At the same time

the wet sieving method could better simulate the field environment than the dry sieving method

and truly reflect the distribution and stability of soil aggregates.

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