Biochar derived from papermill factories improves soil physical and hydraulic properties in no-till cotton fields  

作　　者：Yuanyuan Li Gary Feng Haile Tewolde 

机构地区：[1]School of Agricultural Sciences,Zhengzhou University,Zhengzhou 450001,China [2]USDA-ARS,Genetics and Sustainable Agriculture Research Unit,Mississippi State,MS 39762,USA [3]State Key Lab.of Soil Erosion and Dryland Farming On the Loess Plateau,Institute of Soil and Water Conservation Northwest A&F Univ.,Yangling 712100,Shaanxi,China

出　　处：《Biochar》2023年第1期603-620,共18页生物炭（英文）

基　　金：National Natural Science Foundation of China(No.42207381);China Scholarship Council(No.201806350218).

摘　　要：Whether biochar produced as a by-product of energy generation from the papermill industry,and often disposed in landfills,can be gainfully applied to commercial croplands has not been investigated.The objective of this study was to investigate the physical and hydraulic properties of soils in commercial cotton fields managed as no-till systems following repeated applications of biochar generated as a waste of a papermill plant.Undisturbed cores and disturbed soil samples were collected from 0-5 and 5-10 cm layers from five commercial no-till fields in Mississippi,USA that received 6.7 Mg ha^(−1) year^(−1) biochar for 0,2,3,5 or 10 years.A number of physical,hydraulic,and chemical properties of these samples were measured in the lab.The results showed that biochar reduced the degree of soil compactness and increased soil aggregation and structural stability index.The findings were particularly apparent for the 10 years of consecutive application,which increased soil aggregate stability by up to 67%,reduced bulk density from 1.40 to 1.26 g cm^(−3),and reduced degree of compactness from 73.2%to 62.8%.Biochar increased soil porosity but much of this increase(55%)occurred for small pores(<0.5μm)with little effect on storage pores(0.5-50μm)or transmission pores(>50μm).Consequently,biochar increased soil field capacity by up to 26%,but PAW increased by only 17%.Biochar significantly increased soil physical quality index score in the 0-5 cm layer from 0.16 to 0.26 and the increase was positively correlated with the number of years of application.The results suggest biochar generated as a byproduct of papermill could be land-applied in real-world crop production systems to improve soil health as an alternative to disposal in landfills.

关 键 词：BIOCHAR Papermill DISPOSAL Commercial no-till cotton field Plant available water Soil physical quality index(SPQI) 

分 类 号：S152[农业科学—土壤学]