蚯蚓粪施用量对黄土区典型土壤团聚体及其有机碳分布的影响  

Effects of earthworm cast application rate on soil aggregates and aggregate-associated organic carbon distribution in typical soils from the loess areas

作　　者：李彦霈 邵明安[1,2,3,4] 王娇 Li Yanpei;Shao Ming’an;Wang Jiao(State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling 712100,China;Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;CAS Center for Excellence in Quaternary Science and Global Change,Xi'an 710061,China)

机构地区：[1]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌712100 [2]中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室,北京100101 [3]中国科学院大学,北京100049 [4]中国科学院第四纪科学与全球变化卓越创新中心,西安710061

出　　处：《农业工程学报》2021年第3期90-98,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：中国科学院战略性先导科技专项(XDA23070202)。

摘　　要：为探究蚯蚓粪施用量对黄土区典型土壤团聚体及其结合碳的影响,该研究采用土柱培养试验,研究了黄绵土(CS)、黑垆土(DS)和风沙土(AS)团聚体和有机碳的数量及稳定性对不同蚯蚓粪施用量(0、1%、3%和5%)的响应。结果表明,施用蚯蚓粪后粒径不大于0.25 mm团聚体含量在CS和DS中降低了9.2%~24.7%和7.0%~21.3%;AS中在3%和5%用量条件下减少了25.9%~34.0%。3%用量蚯蚓粪对CS、DS和AS水稳性团聚体数量、平均重量直径、几何平均直径和粒径大于0.25 mm团聚体含量提高有显著作用,但用量增加至5%后效果未进一步改善。施用1%~5%用量蚯蚓粪可使土壤有机碳增加17.9%~66.9%,同时也提高了各级团聚体结合碳含量。施用蚯蚓粪后,不大于0.25mm团聚体对总有机碳贡献率在CS和DS中降低了21.4%~41.1%和15.7%~20.4%,3%和5%用量处理间没有差异。各级团聚体中易氧化碳含量随蚯蚓粪施用量的增加而增大。综合考虑土壤团聚体和有机碳对蚯蚓粪施用量的响应可知,3%用量蚯蚓粪即可有效提升土壤团聚体和有机碳稳定性。研究可为合理利用蚯蚓粪对黄土区土壤结构进行改良提供依据。Earthworm casts exhibit remarkable fertility and have been used since long as an organic fertilizer for agricultural production in many areas of China.Both soil structure and properties are effectively influenced by applying earthworm casts.However,the effects of earthworm casts on the physical properties of soils from Loess Plateau have not been well understood.This study focused on the effects of earthworm cast application on soil aggregates and aggregate-associated organic carbon and their stability.Soil column experiments were conducted in the laboratory using three typical soils(Loess soil,CS;Dark loessial soil,DS;Aeolian sandy soil,AS)at four earthworm cast application rates(0,1%,3%and 5%).After incubation for four months,soil samples were collected from each column for determination of dry aggregate size distribution and water-stable aggregate content.Organic carbon contents of the aggregates were determined as well.The results showed that the content of dry aggregates increased after applying earthworm cast for the fractions lower than 0.25 mm by 9.2%-24.7%and 7.0%-21.3%for CS and DS,respectively.The aggregates lower than 0.25 mm in AS,however,were significantly decreased by 25.9%-34.0%under the treatments of 3%and 5%application rates.Applying earthworm cast with rates of 3%and 5%was beneficial for the increase of water stable aggregates.The contents of water stable aggregates were significantly increased as compared with CK in all three soils.The mean weight diameter,geometric mean diameter,and content of aggregates of higher than 0.25 mm increased after earthworm cast application for AS,while the value of fractal dimensions decreased.These indexes varied when the application rate reached 3%for CS and DS.The results indicated applying earthworm cast with rates of 3%helped to improve aggregate stability,while no further improvement were observed with a higher application rate of 5%.Additionally,application of earthworm casts significantly increased soil organic carbon content.Meanwhile,the contents of agg

关 键 词：团聚体 土壤 有机碳 蚯蚓粪 黄土 易氧化碳 团聚体结合碳 

分 类 号：S152.4[农业科学—土壤学]