摘要
通过对滨海盐化潮土小麦—玉米轮作2年田间定位试验,研究不同改良剂施用对土壤团聚体分布、稳定性及土壤团聚体中有机碳含量、各级团聚体有机碳对总有机碳贡献率的影响。试验共设置3个处理:对照(CK)、有机土壤改良剂(OSA)和有机—无机土壤改良剂(CSA),分析土壤团聚体分布、水稳性大团聚体(R0.25)、平均重量直径(mean weight diameter,MWD)、几何平均直径(geometric mean diameter,GMD)、分形维数(D)、有机碳储量(soil organic carbon storage,SOCS)和有机碳贡献率(contribution rate of organic carbon)。结果表明,滨海盐化潮土水稳性团聚体组成主要以<0.25 mm粒径为主,改良剂施用后土壤R0.25显著提高,其影响主要集中在>5 mm和2~5 mm粒径级,OSA处理2个粒级团聚体含量较CK分别显著增加167.38%和59.00%,CSA处理分别显著增加89.17%和100.66%。施用OSA与CSA同时显著提高了土壤团聚体MWD和GMD值,说明2种改良剂的施用均有利于提高大团聚体数量及稳定性。施用改良剂2年处理土壤各粒级团聚体中有机碳含量均有所提高,OSA处理以1~2 mm粒级提高最多,CSA以2~5 mm粒级提高最多,且前者达显著水平。与CK相比,改良剂可促使土壤有机碳向大团聚体富集,显著提高>1~2 mm粒级团聚体对土壤总有机碳的贡献率93.62%~109.76%,降低或显著降低<1~2 mm粒级团聚体对土壤总有机碳的贡献率20.55%~24.92%。在小麦—玉米轮作模式下,改良剂施用不仅可以显著提高滨海盐化潮土水稳性大团聚体含量和稳定性,还可显著增加水稳性大团聚体有机碳含量与储量,是加强盐碱土壤有机碳库积累的有效措施。
Based on two-year wheat/maize rotation field experiment on coastal salinized Fluvo-aquic soil,the effects of different soil amendments on soil aggregates distribution and stability,organic carbon content and the contribution rates of different size class aggregates to total organic carbon had been studied.The field experiment consisted of 3 treaments,no soil amendments(CK),organic soil amendments(OSA),and organic-inorganic compound soil amendments(CSA).Soil samples were collected for analysis of soil aggregates distribution,water-stable macro-aggregates(R0.25),mean weight diameters(MWD),geometric mean diameters(GMD),fractal dimension(D),soil organic carbon storage(SOCS)and its distribution in aggregates.The results showed that the composition of soil aggregates in the coastal salinized Fluvo-aquic soil was dominated by<0.25 mm water-stable aggregates.The application of soil amendments significantly increased the number of large aggregates(>0.25 mm),and the effects on>5 mm and 2~5 mm aggregates were the highest among different aggregates.Compared with CK,the numbers of>5 mm and 2~5 mm aggregates under OSA treatment significantly increased by 167.38%and 59.00%,while those under CSA treatment significantly increased by 89.17%and 100.66%.The MWD and GMD were significantly increased under the OSA and CSA treatments,which suggested that the application of OSA and CSA increased the number and stability of large aggregates.The SOC content of all aggregates fractions under OSA and CSA treatments were higher than those under CK after two-year located trials,and the effects on 1~2 mm and 2~5 mm aggregates were the highest under the OSA and CSA treatment,respectively.As the application of soil amendments,SOC accumulated within macroaggregates,which has a relatively faster turnover rate.Compared with CK,the application of soil amendments significantly increased the contribution rate to the total SOC in>2 mm size of aggregate by 93.62%~109.76%,while it reduced or significantly reduced in<1 mm size aggregate by 20.55%~24.92%.Therefor,the application of soil amendments is the effective method to improve the stability of soil water-stable aggregates and increase the SOC content of macro-aggregates,as well as further promote the sequestration of organic carbon in wheat/maise rotation system.
作者
马征
王学君
董晓霞
刘苹
郑福丽
沈玉文
MA Zheng;WANG Xuejun;DONG Xiaoxia;LIU Ping;ZHENG Fuli;SHEN Yuwen(Agricultural Resources and Environment Institute, Shandong Academy of Agricultural Sciences, Key Laboratory of Agro-Environment of Huang-Huai-Hai Plain, Ministry of Agriculture and Rural Affairs, P.R.China, Key Laboratory of Wastes Matrix Utilization, Ministry of Agriculture and Rural Affairs, P.R.China, Shandong Provincial Plant Nutrition and Fertilizer, Jinan 250100)
出处
《水土保持学报》
CSCD
北大核心
2020年第4期327-333,共7页
Journal of Soil and Water Conservation
基金
国家重点研发计划项目(2017YFD080602,2016YFD0200103)
山东省重点研发计划项目(2017cxgc0311)
山东省农科院科技创新工程项目(CXGC2016A05)。
关键词
土壤改良剂
滨海盐化潮土
土壤团聚体
有机碳
碳储量
soil amendments
coastal salinized fluvo-aquic soil
soil aggregate
organic carbon
carbon storage
