太行山中低山区河谷内农田斑块特征及其分布格局——以河北省阜平县胭脂河主流河谷为例

以景观生态学原理为指导,调查了位于太行山中低山区的河北省阜平县胭脂河主流河谷,对河谷内农田斑块的特征及其分布格局进行了分析.结果表明,农田斑块除河流源头外贯穿整个河谷,从上游向下游,人为活动的增加使农田的比重不断增加,导致自然景观减少,环境异质性降低,农田斑块破碎化程度减小.胭脂河河谷总面积为2297.09hm²,构成河谷景观主体的农田有117个斑块,面积为1027.78hm²,占河谷面积的44.74%.农田基本紧靠河岸分布,处在水分条件优越但易受洪水威胁的土地带上.农田在河流两侧是非对称分布,其中左岸农田面积587.58hm²,占57.17%.斑块的宽度呈增加的态势,但变化比较大,基本上以狭长的特征出现.

Characteristics and distribution pattern of farmland patch in river valley in middle and low Taihang mountain area-A case study in Yanzhi river in Fuping county,Hebei Province

Based on the investigations in the main valley of Yanzhi river in Fuping county of Hebei Province,the characteristics and distribution patterns were analyzed. The results indicated that farmland patches were distributed in the whole valley,except the headstream reach. With the increase of human disturbances, the proportion of farmlands increased along the river from upstream to downstream, while in natural landscapes, the environmental heterogeneity and fragmentation of farmlands decreased.The area of Yanzhi river valley totaled 2297.09hm²,mainly composed by farmland.There were 117 farmland patches mainly distributed along the riverbank in the valley, totalling 1027.78hm² and occupying 44 74% of the valley,which were very well irrigated,but always endangeed by flood. The farmland patches were not symmetrically distributed along river, with 57.17% of farmland located on the left side of bank. The width of farmland patch presented an increasing trend, with a remarkable variation.The farmland patches were mainly strip-shape.