中国生态农业学报2017，Vol.25Issue(2)：267-275,9.DOI:10.13930/j.cnki.cjea.160678
室内恒温条件下稻田土壤中菌渣的分解过程及CO2释放特征
Decomposition process and CO2 release characteristics of spent mushroom substrate in paddy soils
摘要
Abstract
Spent mushroom substrate (SMS),leftovers after cultivation of mushroom,could serve as an organic fertilizer.In this study,different proportions of SMS were mixed into paddy rice soils under laboratory conditions to study the relationship between application of SMS and soil organic carbon decomposition,and further provide reference for the rational utilization of SMS for sustainable agricultural development.The study consisted of 5 treatments — no SMS application (TS),SMS mix with paddy rice soil at 10 ∶ 1 (SM1),SMS mix with paddy rice soil at 5 ∶ 1 (SM2),SMS mix with paddy rice soil at 2 ∶ 1 (SM3)and sole SMS medium (TM).Then changes in soil organic carbon and nitrogen,decomposition process of organic carbon in soils and CO2 release characteristics in each treatment were determined.The results showed that soil organic carbon and total nitrogen contents under different proportions of SMS treatments were significantly higher than those under TS treatment for the same incubation time.Increase in organic carbon and total nitrogen contents mainly depended on the amount of SMS added to the soil.TM treatment showed the most obvious effect,which increased soil organic carbon and total nitrogen contents by 10.7 and 11.0 times,respectively.With increasing duration of incubation time,soil organic carbon and nitrogen decreased with the decomposition of carbon and nitrogen in all the treatments.Also organic carbon and nitrogen decreased relatively quickly under TM treatment after 35 d.The more SMS supply,the greater was the residue rate.After 63 d of cultivation,the relationships between the residue rates of organic carbon (Yc) and nitrogen (YN) with the amount of SMS (X) were as follows:Yc =71.26X-0.607 5 (r2 =1.000 0**) and YN =74.039X-0.413 3 (r2 =0.999 9**).The release rates of CO2 in all the treatments increased initially and then decreased before stabilization.The higher the amount of SMS,the higher was the release rate of CO2.On the 7th d after cultivation,the release rate of CO2 was highest in each treatment.After 14 d of cultivation,the release rate of CO2 in each treatment gradually decreased at a steady state.The order of the release rate of CO2 during the culturing period was TM ＞ SM3 ＞ SM2 ＞ SM1 ＞ TS.The cumulative release of CO2 showed a rapid growth in the early and slowed growth in the late periods.Mineralization intensity of soil organic carbon was very small after 35 d of cultivation and most of the organic carbon was fixed in the soil.In all the treatments,TM showed the lowest organic carbon mineralization intensity,indicating that SMS was beneficial for soil carbon sequestration.关键词
菌渣/稻田土壤/有机碳/全氮/分解过程/CO2释放Key words
Spent mushroom substrate (SMS)/Paddy rice soil/Organic carbon/Total nitrogen/Decomposition process/CO2 release分类
农业科技引用本文复制引用
栗方亮,王煌平,张青,王利民,安梦鱼,罗涛..室内恒温条件下稻田土壤中菌渣的分解过程及CO2释放特征[J].中国生态农业学报,2017,25(2):267-275,9.基金项目
土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所)开放基金(Y412201437)、福建省属公益类基本科研专项(2015R1022-8)和“十二五”国家科技支撑计划(2012BAD14B15)资助Supported by the Open Foundation of State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences (Y412201437) （中国科学院南京土壤研究所）
the Basic Scientific Research Projects for Public Welfare of Fujian Province (2015R1022-8) （2015R1022-8）
and the National Key Technologies R&D Program of China (2012BAD14B15) （2012BAD14B15）
