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/hm^(2)生物炭(BC)、20 t/hm^(2)枯草芽孢杆菌(PGBS)、20 t/hm^(2)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。
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/hm^(2) biochar(BC),20 t/hm^(2) B.subtilis(PGBS),20 t/hm^(2) 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.
作者
刘帅
赵西宁
李钊
丁艳宏
高晓东
王建平
LIU Shuai;ZHAO Xining;LI Zhao;DING Yanhong;GAO Xiaodong;WANG Jianping(Ministry of Education Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas,Northwest A&F University,Yangling,Shaanxi 712100;College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling,Shaanxi 712100;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100;Baota District Fruit Bureau,Yan’an,Shaanxi 716000)
出处
《水土保持学报》
CSCD
北大核心
2021年第2期193-199,共7页
Journal of Soil and Water Conservation
基金
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)。
作者简介
第一作者:刘帅(1996-),男,硕士研究生,主要从事农业水土资源高效利用研究。E-mail:1164658818@qq.com;通信作者:赵西宁(1976-),男,研究员,主要从事农业水土资源调控与利用研究。E-mail:xiningz@aliyun.com。
