摘要
耕地系统变化直接影响耕地生产能力和国家粮食安全。该研究以东北黑土区典型地域克山县为研究区,重构耕地系统的科学内涵,运用GIS、RS手段和Matlab计算机编程,采用地理探测器模型,识别研究区1986年、2010年和2018年耕地系统变化关键影响因子,测算关键影响因子、各因子间交互作用对耕地系统变化的作用关系,揭示研究区耕地系统变化机理。结果表明:1)耕地系统是具有长、宽、高的有机立体空间,在一定范围内是所有要素综合作用结果,同时它受周围环境影响与垂直方向、水平方向因子共同形成一个微生态环境。2)1986年、2010年和2018年影响耕地系统变化的关键影响因子分别为5个、8个和6个。1986—2018年不同时期耕地系统变化均受系统内部因子作用的影响,随着时间推移,水平方向作用因子对耕地系统变化的影响逐年加强,垂直方向作用因子的影响减弱,表现为影响耕地系统变化程度的关键影响因子由自然要素为主,转向自然与人类活动因素的双重影响。其他因子影响相对较弱。3)1986—2018年不同时期耕地系统内部影响因子与垂直和水平方向的其他因子交互作用对耕地系统变化的影响均为最大,水平方向与垂直方向的交互作用在研究期间影响的显著性显化程度不同。与关键单一因子对耕地系统的影响相比,因子间交互作用后对研究区耕地系统变化空间分异的解释能力明显高于单一因子对其作用,具体表现为双因子增强或非线性增强的特征。研究结果较好地反映了不同时期耕地系统变化空间分异的各因素单一和交互作用关系,为保护耕地和保障粮食安全提供了科学依据。
Black soil region in northeast China is one of the four largest black soil areas in the world,serving as an important grain production base with a commodity rate of more than 70%.Production capacity depends directly on the cultivated land system.Taking Keshan County in northeast China as the research area,geo-detector models were used to identify the key influencing factors of cultivated land system changes in 1986,2010,and 2018.Mechanism of cultivated land system change was also clarified using GIS,RS,and Matlab programming,including the weight and interaction of key influencing factors.The results showed that:1)A cultivated land system was a three-dimensional organic space with a length,width,and height,where the comprehensive action of all elements was within a certain range.The length and width were determined by the scale of cultivated land,while the height was determined by the types of crops and the thickness of the cultivated layer.Each element of the cultivated land system had an irreplaceable position and function.A micro-ecological environment also dominated the surrounding vertical and horizontal factors.2)A total of five,eight and six key factors were found to have important influence on the changes of cultivated land systems in 1986,2010,and 2018,respectively.All cultivated land system changes were affected by the internal factors of the system from 1986 to 2018.The influence of horizontal factors on the cultivated land system changes strengthened year by year,whereas,the influence of vertical factors weakened as time went by.The key factors were dominated from natural factors to the dual influence of natural and human activities in recent years.The influence of other factors was relatively weak.3)There was the greatest impact of the interaction between the internal influencing factors of the cultivated land system and others in the vertical and horizontal directions on the cultivated land system change from 1986 to 2018.There was also different significance in the interaction between the horizontal
作者
苏浩
吴次芳
Su Hao;Wu Cifang(School of Public Affairs,Zhejiang University,Hangzhou 310058,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2021年第6期243-251,共9页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家社会科学基金重大项目(14ZDA039)。
关键词
土地利用
遥感
耕地
东北黑土区
微生态环境
粮食安全
机理
land use
remote sensing
cultivated land
northeast black soil area
micro-ecological environment
food security
mechanism
