摘要
坡度是山地丘陵区耕地利用的主要限制因素，不同坡度级的耕地景观格局体现了人类对耕地干扰和利用程度。选择凌源市为低山丘陵区典型，以景观格局理论为指导，借助GIS手段及景观格局指数方法，开展不同坡度级内耕地类型景观斑块特征和景观异质性研究分析，探讨不同坡度级内耕地受人为影响的程度。结果表明：旱地景观是各坡度内级耕地景观的主体类型，对耕地景观的贡献率最大；水浇地和菜地景观在0°-2°坡度级内连通性好，连片度高，属于耕地景观中的优势景观；2°以上坡度级内水田和菜地景观分布较为破碎分散。在0°-2°坡度级内，耕地各景观类型斑块密度值差异明显，异质性较强，受人为干扰较大。旱地景观在各坡度级内斑块平均距离最短，受人为干扰大；菜地和水田景观平均距离最长，分布较为分散，受人为干扰小。
Gradient is the main limiting factor of farmland using in mountain and hilly areas. The farmland landscape in different gradient levels reflects the human disturbance and using degree to farmland. Taking Lingyuan, Liaoning as example, the research of landscape patch characteristics and landscape heterogeneity of farmland in different gradient levels by GIS and landscape metrics method on the guiding of landscape theory, and the human influence degree to farmland use were investigated. The research result showed that the dry land landscape was the main type and had the high contribution rate of farmland landscape in different gradient levels, the irrigated land and vegetable land landscape had high contagion and connectivity,which belonged to superior landscape in 0°-2°gradient level, however, the paddy land and vegetable land landscape were distributed broken and dispersed. The patch density value each farmland landscape was obviously different in 0°-2°gradient level. The landscape heterogeneity was big and the human disturbance degree to farmland using was the highest in this gradient level. The patch average distance of dry land landscape was the shortest, which meant the human disturbance degree was relatively high to dry land landscape. The patch average distance of the paddy land and vegetable land landscape was the longest, which meant the human disturbance degree was relatively low to the paddy land and vegetable land landscape.
出处
《沈阳农业大学学报》
CAS
CSCD
北大核心
2013年第6期766-770,共5页
Journal of Shenyang Agricultural University
基金
国家自然科学基金项目(41340011)
教育部高等学校博士学科点专项科研基金项目(20122103120012)
关键词
低山丘陵区
坡度
耕地类型
景观格局
low mountains and hills
gradient level
farmland type
landscape pattern
