Effects of Biochar on Enzymatic Activities and Root Characteristics of Cucumber in Continuous Cropping soil of Greenhouse
In this study, we took the continuous cropping (15 years) soil and cucumber in greenhouse as research object to investigate the effects of different biochar applications (0,20,40 t·hm-2)on soil physicochemical properties, soil enzyme activities, and the root characteristics of cucumber. Results showed that the activities of soil urease, catalase and acid phosphatase in treatments with biochar increased remarkably, and the BC2 treatment(40 t·hm-2) was more effective than that in BC1(20 t·hm-2). Compared to the control, soil urease activities of BC1 and BC2 increased by 15.7％ and 23.8％, soil acid phosphatases by 82.5％and 99.2％, soil catalase by 53.0％ and 74.6％ respectively. No significant difference of soil invertase was observed among these treatments. Biochar application had obvious effect on soil physicochemical properties. The soil alkali-hydrolyzable nitrogen and EC value of BC1 and BC2 decreased by 14.8％, 15.1％ and 14.2％, 20.6％. However, with the biochar application, the soil available phosphorus, available potassium, organic carbon and pH value increased significantly. Biochar application could stimulate the cucumber root growth, and in biochar-treated soils, there were higher quantity, total length, total superficial area and activity of cucumber roots compared with untreated soils. Moreover, results indicated that the cucumber roots characteristics significantly correlated with part of soil physicochemical properties, especially soil pH,available potassium and soil organic carbon. Comprehensive analysis showed that biochar application was conducive to improve the continuous cropping cucumber greenhouse soil and promote the development of root system.
国家科技期刊平台
NSTL
万方数据
维普
