摘要
土壤团聚体力稳性直接影响根系生长和农业耕作等过程。为探究不同类型土壤团聚体力稳性的区域分异规律,自北向南选取典型农业种植区耕作土壤(黑土、褐土、红壤和砖红壤),通过抗压试验测定不同粒径团聚体(1~2、3~5、>5~8、>8~10 mm)的抗张强度、破碎能量和易碎性指数,分析其与土壤理化性质和气候因子间关系。结果表明:抗张强度和破碎能量自北向南逐渐减小,并随团聚体粒径增大而减小,但具体变化特征因土壤类型而异。易碎性指数自北向南先增大后减小,其中红壤最大(0.87),黑土最小(0.47);相比温带地区黑土和褐土,亚热带和热带的红壤和砖红壤易碎性指数的粒径分异更为明显,表现为其小粒径团聚体易碎性指数(1.10和0.76)显著高于大粒径团聚体(0.65和0.58)。抗张强度和破碎能量与蛭石呈极显著正相关关系(r=0.73和0.70,P<0.01),与年均降水量呈极显著负相关关系(r=-0.72和-0.72,P<0.01);易碎性指数与年均降水量呈极显著正相关关系(r=0.66,P<0.01),与蛭石、碳氮比、非晶形氧化锰呈极显著负相关关系(r=-0.75~-0.66,P<0.01),表明在区域尺度上气候因子通过黏土矿物控制团聚体力稳性的空间分异。研究结果为不同区域农业土壤质量的评估与改良提供了理论依据。
Aggregate mechanical stability greatly influences plant root growth,energy efficiency and ease of tillage,wind and water erosion.A mechanistic understanding of soil aggregate mechanical stability is of great significance for evaluating and improving soil quality.To date,how aggregate mechanical properties vary over different types of soils remains poorly understood.To this end,four cultivated soils including Black soil,Cinnamon soil,Red soil,and Latosol were separately selected in typical agricultural producing areas from the north to south in eastern China.The objectives of this study was to investigate the difference of aggregates among differet typical arable soils in China and its influential factors.The soil samples were collected from the top 20 cm.Tensile strength,specific rupture energy,friability index of different aggregate sizes(1-2,>3-5,>5-8,>8-10 mm)were calculated and measured by a compression test to analyze their relationships with soil physicochemical properties and climate factors.The results were shown as follows:Tensile strength and specific rupture energy decreased gradually from north to south and decreased with increasing aggregate size.The tensile strength of 1-2 mm aggregates(a mean value of 661.5 kPa)was significantly higher than that of≥3 mm aggregates(a mean value of 240.3 kPa);there was no significant difference between the tensile strength of>5-8 mm and>8-10 mm aggregates(P>0.05).The specific variation of specific rupture energy differed with soil types.The friability index increased first and then decreased from south to north,with the highest and lowest values in red soil(0.87)and black soil(0.47),respectively.Compared to the Black and Cinnamon soils in temperate zones,the variations of friability index among aggregate sizes were more remarkable for Red soil and Latosol in subtropical and tropical zones,where friability index was larger for small aggregates(1.10 and 0.76)than for large aggregates(0.65 and 0.58).Tensile strength and specific rupture energy were correlated positive
作者
刘益辰
范雪松
杨晨曦
周金星
吴新亮
LIU Yichen;FAN Xuesong;YANG Chenxi;ZHOU Jinxing;WU Xinliang(Key Laboratory of State Forestry and Grassland Administration on Soil and Water Conservation,School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;National Location Observation Research Station of Jianshui Desert Ecosystem in Yunnan,Beijing Forestry University,Beijing 100083,China;Institute of Eco-environmental and Soil Sciences,Guangdong Academy of Sciences,Guangzhou 510650,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2023年第21期47-53,共7页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(41807015)
国家重点研发计划项目(2022YFF1302901)。
关键词
团聚体
土壤
降水量
团聚体稳定性
抗张强度
易碎性指数
破碎能量
aggregates
soils
precipitation
aggregate stability
tensile strength
friability index
specific rupture energy
