Effects of Different Amendments on Aggregate and Water Content of Loam Soil in Dryland Apple Orchard

LIU Shuai; ZHAO Xining; LI Zhao; DING Yanhong; GAO Xiaodong; WANG Jianping

doi:10.13870/j.cnki.stbcxb.2021.02.026

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Effects of Different Amendments on Aggregate and Water Content of Loam Soil in Dryland Apple Orchard

更新时间：2025-03-12

- Effects of Different Amendments on Aggregate and Water Content of Loam Soil in Dryland Apple Orchard
- Vol. 35, Issue 2, Pages: 193-199(2021)
- 作者机构：
  
  1. 西北农林科技大学旱区农业水土工程教育部重点实验室, 陕西杨凌,712100
  2. 西北农林科技大学水利与建筑工程学院, 陕西杨凌,712100
  3. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
  4. 延安市宝塔区果业局,陕西,延安,716000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.02.026
  CLC： S152.4
- Published：2021
- 稿件说明：
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LIU Shuai, ZHAO Xining, LI Zhao, et al. Effects of Different Amendments on Aggregate and Water Content of Loam Soil in Dryland Apple Orchard[J]. 2021, 35(2): 193-199.
DOI：

LIU Shuai, ZHAO Xining, LI Zhao, et al. Effects of Different Amendments on Aggregate and Water Content of Loam Soil in Dryland Apple Orchard[J]. 2021, 35(2): 193-199. DOI： 10.13870/j.cnki.stbcxb.2021.02.026.

摘要

为对比研究植物根际促生菌（枯草芽孢杆菌、胶质芽孢杆菌）和苹果树枝生物炭的施加对黄土丘陵区山地苹果园粉质壤土团聚体含量、稳定性以及土壤水分的影响，采用田间定位试验，设置4个处理：施加65 t/hm2生物炭（BC）、20 t/hm2枯草芽孢杆菌（PGBS）、20 t/hm2胶质芽孢杆菌（PGBM）和对照（CK）。湿筛法获得土壤各粒径团聚体含量，并计算水稳性团聚体的平均重量直径（MWD）、几何平均直径（GMD）和分形维数（D）。结果表明：BC、PGBS和PGBM处理有机碳含量（SOC）较CK提升18.04%~206.91%，全氮（TN）含量较CK提升6.11%~66.56%。分析表明，BC、PGBS和PGBM处理0—60 cm土层>0.25 mm团聚体含量显著增加；各处理分形维数D较CK均降低，MWD、GMD均高于对照CK，大小顺序为PGBS>PGBM>BC，施加改良剂可以增加土壤团聚体的稳定性。各处理0—60 cm土层土壤饱和导水率和土壤含水量均得到提升。施加生物炭和植物根际促生菌可以显著提升土壤有机碳和全氮含量，增强土壤结构稳定性，提升土壤含水量，生物炭处理对于土壤有机碳和全氮含量的提升优于植物根际促生菌，但植物根际促生菌施用对土壤结构稳定性的提升更佳。

Abstract

To comparatively explore the effects of the application of biochar and plant growth-promoting rhizobacteria (Bacillus subtilis and Bacillus mucilaginosus

PGPR) on the soil aggregate content

soil aggregate stability

and soil moisture of the silty loam soil of the mountain apple orchard on the loess hilly region

we adopted field research and set four treatments:65 t/hm2 biochar (BC)

20 t/hm2 B. subtilis (PGBS)

20 t/hm2 B. mucilaginosus (PGBM)

and control (CK). The aggregate content of different soil particle size were examined by wet sieving method

and the mean weight diameter (MWD)

geometric mean diameter (GMD)

and fractal dimension (D) of water-stable aggregates were calculated. The results showed that compared with CK

the soil organic carbon (SOC) increased by 18.04%~206.91%

and the total nitrogen (TN) content increased by 6.11%~66.56% in BC

PGBS

and PGBM treatment. The content of > 0.25 mm aggregates in the 0—60 cm soil layer increased significantly in treatment BC

PGBS

and PGBM. Compared with CK

the fractal dimension D was decreased and the MWD and GMD were increased in different treatments

of which the order of magnitude was PGBS>PGBM>BC and this indicated that the application of amendments can increase the stability of soil aggregates. The saturated hydraulic conductivity and soil water content of the 0—60 cm soil in each treatment were increased. The application of PGPR and biochar could significantly increase the content of soil organic carbon and total nitrogen

enhance the stability of soil structure

and increase soil saturated hydraulic conductivity and water content. The improvements of soil organic carbon and total nitrogen content by biochar treatment was better than that by plant growth-promoting rhizobacteria

while the plant growth-promoting rhizobacteria treatment improved the stability of soil structure better.

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