养殖废水灌溉对土壤易氧化碳与碳库管理指数的影响  

The Effects of Livestock-farm Wastewater Irrigation on soil Labile Organic Carbon and Carbon Management Index

作　　者：廖林仙[1] 郭航 黄俊[1] 徐俊增[1] 刘诗梦 陈丽娜[1] LIAO Lin-xian;GUO Hang;HUANG Jun;XU Jun-zeng;LIU Shi-meng;CHEN Li-na(College of Agricultural Engineering,Hohai University,Nanjing 210098,Jiangsu Province,China)

机构地区：[1]河海大学农业科学与工程学院,南京210098

出　　处：《中国农村水利水电》2021年第11期123-127,135,共6页China Rural Water and Hydropower

基　　金：中央高校基本科研业务费专项资金(2019B17914)。

摘　　要：为了研究养殖废水灌溉对土壤剖面易氧化碳的分布和碳库管理指数的影响,以玉米为试验作物,设置了清水和养殖废水两种灌溉水质以及64、76、88 mm 3个灌水量等级,对6种灌溉处理下0-60 cm土层中土壤总有机碳和易氧化碳含量进行了测定与分析。结果表明:两种灌溉水质下总有机碳和易氧化碳在土壤表层(0-20 cm)含量较高,且随土层深度增加而减少;随灌水量增加,养殖废水相较于清水灌溉更能增加土壤表层(0-20 cm)总有机碳含量,增加幅度可达10.79%,在相同灌水量等级下,相较于清水灌溉,养殖废水灌溉处理后土壤表层(0-20 cm)中易氧化碳的含量显著提升了2.94%-43.75%;随着时间推移,养殖废水灌溉处理后土壤表层(0-20 cm)的碳库管理指数明显高于清水灌溉处理。与清水灌溉相比,养殖废水灌溉通过提高各土层的易氧化碳占比,增强了土壤中有机碳的有效性,促进了土壤养分的转化和供应,为植物和微生物的生长发育提供了更好的土壤环境。研究结果可为制定合理的养殖废水灌溉方案提供参考。In order to study the effects of livestock-farm wastewater irrigation on the distribution of labile organic carbon(LOC)and the change of carbon management index(CMI)in different soil layers,lysimeter experiment with two qualities of irrigation(clear water and livestock-farm wastewater)as main factors and three quotas of irrigation(64 mm,76 mm and 88 mm)as sub-factors is conducted and the contents of soil organic carbon(SOC)and LOC in the soil layer of 0-60 cm are analyzed.The results show that the contents of SOC and LOC are the highest in surface soil(0-20 cm)and decreases with the increase in soil depth under six treatments.The contents of SOC in surface soil(0-20 cm)irrigated by livestock-farm wastewater is up to 10.79%higher than that by clear water with the increase in irrigation quota.The content of LOC in surface soil(0-20 cm)irrigated by livestock-farm wastewater increases by 2.94%-43.75%compared with the irrigation of clear water at the same irrigation quota.Moreover,CMI in surface soil(0-20 cm)under the irrigation treatment of livestock-farm wastewater is more than that of clear water over time.Compared with clear water irrigation,livestock-farm wastewater irrigation can enhance the availability of organic carbon in soil by increasing the proportion of LOC to SOC in each soil layer,promote the transformation and supply of soil nutrients,and provide a better soil environment for the growth and development of plants and microorganisms.The research results serve as a reference for the formulation of the irrigation scheme of livestock-farm wastewater.

关 键 词：养殖废水 灌溉 有机碳 易氧化碳 碳库管理指数 

分 类 号：TV93[水利工程—水利水电工程] S274.1[农业科学—农业水土工程]