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| 北京市延庆县耕地景观特征 | |
| 引用本文： | 杨晓艳,闫东浩,程锋.北京市延庆县耕地景观特征[J].资源科学,2005,27(3):98-104. |
| 作者姓名： | 杨晓艳 闫东浩 程锋 |
| 作者单位： | 1. 中国农业大学资源与环境学院,北京,100094 2. 国泰土地整理有限公司,北京,100873 3. 国土资源部土地整理中心,北京,100035 |
| 摘 要： | 本文通过对不同耕地类型区的典型样区调查从较小尺度研究延庆县耕地景观特征.选用斑块面积、斑块周长、斑块密度、边界密度等指标来描述耕地景观的斑块特征;采用全部廊道占耕地景观面积的比例、廊道类型、各类型廊道的密度、各类型廊道网络的连通度、环状网络的环通度来表达耕地景观中的廊道特征.研究结果表明,延庆县耕地斑块规模较小、零碎,斑块不规整;景观破碎化程度比较严重;耕地景观被边界分割的程度比较高;景观粒度较小;上述情况在坡耕地区域尤为严重.廊道占耕地景观面积的比例大,廊道类型主要包括道路、沟渠,坡耕地区还包括田坎.道路的密度较大,但道路网络连通性和环通性差,为耕地生态系统中的物流和能流提供的连通的、可选择的线路比较少.沟渠密度较小,有的样区根本没有沟渠分布,其网络连通性更差,沟渠廊道体系不健全,耕地的灌溉保证程度和排洪能力比较低.坡耕地中田坎占地面积比较大,加剧了坡耕地景观中廊道占耕地面积比例大的程度. |
| 关 键 词： | 耕地景观 斑块 廊道 典型样区 |
| 文章编号： | 1007-7588(2005)03-0098-07 |
| 修稿时间： | 2004年6月23日 |
Landscape Features of Cultivated Land in Yanqing County of Beijing Municipality |
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| YANG Xiao-yan,YANG Xiao-yan and YANG Xiao-yan.Landscape Features of Cultivated Land in Yanqing County of Beijing Municipality[J].Resources Science,2005,27(3):98-104. | |
| Authors: | YANG Xiao-yan YANG Xiao-yan and YANG Xiao-yan |
| Abstract: | Landscape of cultivated land is an important part of agricultural landscape. The landscape characteristics of cultivated land influence directly ecological process and productivity of cultivated land. This paper studies the landscape characteristics of cultivated land in Yanqing county by examining the 18 reference areas with different cultivated land type, in order to find out the factors and mechanism affecting and controlling productivity and flow of energy and material in cultivated land. The indices of patch area, patch perimeter, patch density, perimeter density and mean patch perimeter area ratio are introduced to describe patch characteristics of cultivated land in Yanqing county. The corridor characteristics of cultivated land are expressed by the indices such as the proportion of area of all corridors to area of cultivated land, types of corridor landscape, density of corridor landscape, network connectivity of corridor landscape, networks ring of annular corridor landscape. The results show that the patches of cultivated land in the county are small and fragmental. The sizes of patches are irregular. Fragmented and divided condition of the patches by boundary are serious. Landscape granularity of cultivated land is small especially in the slope areas. The proportions of area of all corridors to cultivated land are large. Corridor types include roads, ditches and banks on the slopes. The density of roads corridor is high, but the network connectivity and ring of road corridor are poor, i.e., road corridors provide few connected and selectable line for the flows of energy and material. The density of ditches corridor is low, even there are no ditches in a few reference areas. The network connectivity of ditch corridor is also poor; therefore, irrigation guarantee and draining capacity are insufficient. The system of ditch as reflected by the characters of ditches corridor is poor. The banks in the sloping area occupy a high proportion of cultivated land, which increase the proportions of area of all corridors to cultivated land in the sloping area. This study may provide scientific basis for cultivated land consolidation and landscape planning of cultivated land in Yanqing County and other areas with similar environment. |
| Keywords: | Landscape Cultivated land Patch Corridor Reference area |
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