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Changes in soil organic carbon pools following long-term fertilization under a rain-fed cropping system in the Loess Plateau,China

引用

Journal of Integrative Agriculture 2021年第9期20卷 2512-2525页

作者： WANG Ren-jie SONG Jia-shan FENG Yong-tao ZHOU Jiang-xiang XIE Jun-yu Asif KHAN CHE Zong-xian ZHANG Shu-lan YANG Xue-yun Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of Agriculture and Rural Affairs/College of Natural Resources and EnvironmentNorthwest A&F UniversityYangling 712100P.R.China Baoji Extension and Service Centre of Agricultural Technology Baoji 721001P.R.China College of Natural Resources and Environment Shanxi Agricultural UniversityTaigu 030801P.R.China Institute of Soil Fertilizer and Water-saving AgricultureGansu Academy of Agricultural SciencesLanzhou 730070P.R.China

Understanding the mechanism of soil organic carbon(SOC)sequestration is of paramount importance in sustaining crop productivity and mitigating climate ***-term trials were employed to investigate the responses of total SOC and its pools,i.e.,mineral-associated OC(MOC),particulate OC(poc,containing light-poc and Heavy-poc),to fertilization regimes at Yangling(25-year),Tianshui(35-year)and Pingliang(37-year)under a rain-fed cropping system in the Loess *** fertilization regimes in each trial included three treatments,i.e.,control(no nutrient input,CK),chemical fertilizers(CF),and organic manure plus chemical fertilizers(MCF).Relative to the CK,long-term fertilization appreciably increased SOC storage by 134,89 and 129 kg ha^(–1)yr^(–1)under CF,and 418,153 and 384 kg ha^(–1)yr^(–1)under MCF in plough layer soils(0–20 cm),respectively,at the Yangling,Tianshui and Pingliang *** MOC pools accounted for 72,67 and 64%of the total SOC at the above three sites with sequestration rates of 76,57 and 83 kg ha^(–1)yr^(–1)under CF and 238,118 and 156 kg ha^(–1)yr^(–1)under MCF,***,the MOC pool displayed a saturation behavior under MCF *** poc accordingly constituted 27,33 and 36%of SOC,of which light-poc accounted for 11,17 and 22%and Heavy-poc for 17,16 and 15%of SOC,*** sequestration rates of poc were 58,32 and 46 kg ha^(–1)yr^(–1)under CF,and 181,90 and 228 kg ha^(–1)yr^(–1)under MCF at the three respective sites,in which light-poc explained 59,81 and 72%of poc under CF,and 60,40 and 69%of poc under MCF,with Heavy-poc accounting for the *** with CK,the application of CF alone did not affect the proportions of MOC or total poc to SOC,whereas MCF application markedly reduced the proportion of MOC and increased the poc ratio,mainly in the light-poc *** distribution of SOC among different pools was closely related to the distribution and stability of *** present study confirmed that organic

关键词： chemical fertilizer organic manure mineral-associated OC particulate OC light-poc Heavy-poc

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