文章摘要
刘帅, 赵西宁, 李钊, 丁艳宏, 高晓东, 王建平.不同改良剂对旱地苹果园壤土团聚体和水分的影响[J].水土保持学报,2021,35(2):193~199
不同改良剂对旱地苹果园壤土团聚体和水分的影响
Effects of Different Amendments on Aggregate and Water Content of Loam Soil in Dryland Apple Orchard
投稿时间:2020-10-22  
DOI:10.13870/j.cnki.stbcxb.2021.02.026
中文关键词: 山地苹果园  生物炭  植物根际促生菌  土壤团聚体
英文关键词: mountain apple orchard  biochar  PGPR  soil aggregate
基金项目:国家重点研发计划项目(2016YFC0400204);国家自然科学基金项目(41771316);陕西省重点研发计划项目(2020ZDLNY07-04)
作者单位E-mail
刘帅1,2, 赵西宁1,3, 李钊1,2, 丁艳宏1,2, 高晓东1,3, 王建平4 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 
xiningz@aliyun.com 
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中文摘要:
      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。
英文摘要:
      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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