基于景观格局定量分析

1、.基于景观格局定量分析的滨水区景观建设摘要 基于人水和谐的理念，以景观生态学等为理论基础，解析了滨水区的概念及其内涵。认为在城市化进程不断推进 的背景下，滨水区已成为生态敏感脆弱的区域，而构建生态循环 系统、重塑滨水景观环境已成为当务之急。在此基础上，以包括南湖荡主体及沿湖岸 500 km的区域为研究区域，探究了其景观生态分类和景观格局分析。结合相关分析评价，针对南湖荡3个景观子区存在的不同问题 ，对每个子区因地制宜地进行具有不同特色的生态景观建设，以期实现滨水区的生物平衡 、滨水景观的高效和谐与可持续发展。关键词滨水区；景观建设 ；景观生态 ；景观格局水是生命之源，是人类发展史 中不可或缺的

2、一部分。同时，由于人有亲水 、近水的天性 ，水除了满足人们的物质需求外，更需要实现人们的精神追求。水不仅是珍贵的资源，也 是一种优越的景观 ，对滨水地区的发展具有尤为重要的意 义。滨水区经济发展速度快 ，人类活动对其干扰强度大，给水生态系统带来了正、负两方面的效应 ，即在自然和人类活 动的双重作用下，既形成了滨水地区水生态的一些优势 ，也带来了一系列问题。如今 ，如何建设高效、健康 、安全的滨水 景观成为一项热门的研究课题 。1.滨水区概念及其内涵水景观包括水体景观和滨水景观两部分，统称为“滨水景观”在滨水景观建设 中引入滨水 区的概念 ，即生态影响环境范围内水域(江、河 、湖 、海)与陆地相

3、接的一定范围内的区域 ，包括水域、水际线和陆域 3个区域 ，应综合考虑水与陆地的共同构成环境的主导要素进行景观建设。景观是 空间上不同生态系统的聚合 ，是空间上彼此相邻 、功能上相互有关并且发生上有一定特点的若干个生态系统的聚合 。 景观生态学主要研究景观的结构、功能和变化以及景观的规 划管理 。景观生态学为景观建设提供了一个新 的思维模 式景观生态规划，通过对景观空间格局、景观特征 的综 合分析，为景观规划提出最优化方案。滨水区的发展和当地的经济发展水平密切相关 。纵观 滨水景观建设的研究历程，目前国内滨水区景观建设规划中仍然突出体现了以下几个方面的问题 ：缺乏对水域 、水际线和陆域的综合考

4、虑。目前现有景观建设方面存在着一定的片面性 ，不能从滨水区这个整体范围内予以全面考虑和综合解决。对于景观生态、景观格局的分析 比较欠缺。虽然目前生态学、景观生态学等理论思想已经逐步引入滨水景观 建设 中，但尚无一套系统的理论。没有定量描述。目前的 景观建设 主要是定性的分析，对景观没有定量分析与评价。滨水区景观建设是一项复杂的、多目标的系统工程 J，应该综合融入建筑学、地理学、生态学等多学科的知识和方法，以景观生态学为依据，对滨水景观进行格局分析，为滨水区景观建设提供依据。图 1 南湖荡分段2 研究区概况南湖荡位于常熟市区西南部阳澄片内，是经典水上旅游 区的点睛之笔 ，尚湖一望虞河一南湖荡一昆

5、承湖一沙家浜构 成了常熟市的特色水上生态旅游线。笔者以南湖荡为主体，将包括南湖荡主体及沿湖岸 500m的区域作为研究区域。根据湖体形态及水景观现状，将南湖荡划分为3段，拟定各段的基准线(组织空间秩序的基本骨架，也就是联系相对孤立景观元素的线性结构)。分别对3段进行分析评价：第1段，水质较好，存在着一些自然状态下的湿地，有着优美的田园风光，但湖体狭窄 ；第2段，属于传统农业耕作区，有着优美的田园风光 ，景色宜人，湖面平静 、湖水清澈 ，且零 星分布着一些岛屿 ，周围的 自然环境良好，湖体渐宽；第3段，为东部化工厂密集的地段，水体严重污染，水质较差，另外垃圾填埋场附近亦属于生态敏感区。3 研究方法

6、和内容31 景观生态分类311 景观分类原则。景观生态分类就是根据现有资料，综合分析研究区域的自然特征、人类活动以及社会经济条 件，按照一定原则、依据和目标选择分类指标，从功能着眼、从结构着手，对景观生态系统类型进行划分，是景观结构与功能研究的基础，也是进行景观格局分析以及景观生态规划 、评价及管理的前提条件。景观格局分析的前提是景观生态分类 ，除了景观生态学 结构和功能原理、景观动态原理等基本原理外，景观生态分 类还遵循其他一些原则 ：综合性和主导性原则 ； 目标和实用原则 ；异质性与均质性相结合的原则 ；定性和 定量相结合的原则 ；景观功能与生态过程一致性原则。312 南湖荡景观生态分类。

7、对研究土地利用现状进行屏 幕数字化，制作景观图，并建立数据属性库，然后将土地利用 图导入到 CAD中，通过其 中的图形、数据以及文字资料 ，对景观生态进行斑块划分，初步确定个体单元的范围及类型， 构建分类体系。南湖荡的景观生态分为：水域景观(包括鱼 塘)、农耕地 (包括植被地)、居住用地 、工业景观(含垃圾填 埋场)以及未利用地(取总面积中扣除上述类型 以外的剩余面 积)。32 景观格局分析 景观由大小不同的斑块组成 ，而斑块的空间分布称为格局 。对景观空间格局与异质性的定量 描述，就是景观格局指数 ，它是分析景观结构功能及其过程的基础。景观格局分析可以将景观的空间特征和时间过程 联系起来 ，

8、从而清楚地对景观内在规律进行分析和描述。 321 景观格局指数。景观格局指数是高度浓缩的景观格局信息 ，可以比较不同景观或研究区之间的异同，是反映景 观结构组成、空间配置特征的简单量化指标。对于景观格局分析，目前已经提出了许多指标，结合研究区实际情况，笔者选取表l中的几项指标来研究滨水景观格局特征 。322 景观格局结果分析。3221 景观斑块特征指数。对于南湖荡，分维数 、伸展指数取各斑块分维数的平均值，计算结果见表 2、由表中数据显示，各景观类型的分维数都大于，1但又较接近于 1，且各斑块之间的分维数相差并不是很大，这表明斑块之间具有一 定的自相似程度 ，而且也说明该 区域受到一定的人为干

9、扰。 各种景观类型的伸展指数都在5左右 ，结合南湖荡土地利用 现状图以及实际勘测所得到的资料，不难发现这些景观斑块除了湖体外，一般都不是呈狭长分布状态 ，而是接近于圆形，形状相对 比较规则。 表 1 常用景观格局指数分类指数 意义景观斑块 分维数 测定斑块形状的复杂程度特征指数 伸展指数 代表斑块形状与圆形 的差异程度 值越大，则 说明斑块形状越长 ，与圆形差异越大，亦说 明 斑块周边越发达 ，形状越不规则景观多样 多样性指数 综合反映景观斑块丰富程度和均匀程度，值性指数 越大，景观类型越丰富，也就是景观结构组成的复杂性越大优势度 描述一种或几种景观嵌块体支配景观格局的程度，值越大，表明偏离程

10、度越大，即组成景观的各景观类型所占的比例差异大相对均匀度 描述景观各景观类型的分配均匀度指数景观空间分离度 某一景观类型中不同斑块个体分布的分离程构型指数 度 ，值越大，说明景观在地域的分布越分散，破碎化程度也越高景观破碎度 指景观被分割的破碎程度，它在一定程度上反映了人类活动对景观 的干扰强度；值为0时，表示景观完全未被破坏；为1时，表示景观被完全破坏反映同一种类型斑块受到干扰的破碎化程度 ，如果取值较低 ，则表明景观类型的单独斑块面 积较大，反映受人为干扰强度较低反映景观被分割的破碎程度，比值愈大，斑块密度越大，破碎化程度愈高3222 景观多样性指数。南湖荡滨水区景观多样性指数 (取3段平

11、均值)为 1125，但是第3段的多样性则较低，说明该段景观类型不够丰富，且景观结构组成比较单一。另外从优势度(取 3段平均值)也可以看出第 3段多样性指数的最大值和实际值之差较大，也进一步说明了第 3段的景观多样性对最大多样性的偏离程度较大，即各景观类型所占比例差异大，或者说景观只受某一种或少数几个景观类型支配。另外两段各景观类型所占比例差异并不大，各景观分布较均匀。均匀性指数则进一步说明上述情况。3。223 景观空间构型指数。在南湖荡滨水区各景观类型 中，其景观分离度的排序为：水域景观 农耕地 居住用地 工业景观（图表4）。其 中，工业景观分离度较大，说明工业景观在区域上的分布较分散，景观分

12、布也较复杂，破碎化程 度较高。南湖荡滨水区景观破碎度见表 5，其中农耕地破碎度较高，即其破碎化程度较高，说明了人类活动对农耕地的干扰强度较大。水域分布较为集中，其破碎化指数则相对较低，但若将鱼塘等分开考虑的话 ，水域的破碎化程度则将提高。南湖荡河道景观内部生境破碎化指数，都相对较高，这 与景观斑块面积的大小 、人为干扰状况等都有关系，说明程度低 ，景观分布较集 中；但其他几类景观则相反。这一指标也相应反应出各类景观受干扰的强度。表2分形维数的计算结果水景观（包括鱼塘）农业用地（包括植被的土地）住宅用地工业景观（包括垃圾填埋场）分形维数扩展指标分形维扩展指标扩展指标分形维数扩展指标分形维数扩展指

13、标11.128,85.386,31.068,85.355,11.057,35.565,71.071,88.170,921.066,86.203,41.080,45.783,81.052,35.183,41.035,64.763,331.075,66.328,91.054,95.210,11.064,05.476,81.032,54.634,2表3多样性指数的计算结果，优势和相对均匀度部分多样性指数优势相对均匀度11.285,80.323,70.734,621.122,90.486,50.551,930.966,90.642,60.454,8表4隔离度计算结果水景观（包括鱼塘）农业土地（包括植被

14、的土地）工业景观（包括垃圾垃圾填埋场）部分住宅用地10.005,30.007,20.027,42.622,420.001,80.014,70.103,10.211,530.001,50.023,90.308,10.833,4表5计算结果和FN2 FN1景观破碎化景观碎片(FN1)景观破碎化（FN2）水景观（包括鱼塘）农业土地（包括植被的土地）部分住宅用地工业景观（包括垃圾垃圾填埋场）10.003,70.109,40.625,00.187,50.015,620.004,20.120,90.560,40.230,80.044,030.003,70.142,90.628,60.085,70.028,

15、6表6破碎化的指数FI1以及景观内部生境面积计算结果部分景观内部生境面积破碎化指数（FI1）对景观内部生境面积破碎化指数（导致）水面积农业用地住宅用地工业景观未利用土地水面积农业用地住宅用地工业景观未利用土地10.699,70.578,40.882,10.997,00.842,80.869,30.946,60.967,30.998,70.842,820.416,70.765,00.951,80.981,80.884,70.868,70.980,10.994,80.987,50.884,730.345,10.836,80.983,40.993,20.841,40.891,30.973,90.99

16、4,90.997,10.841,4Waterfront Landscape Construction Based on Quantitative Analysis of Landscape PatternAbstract Based on the concept of the harmony between human and water and the theory of landscape ecology, the paper has analyzed the concept and connotation of waterfront area. It is considered that

17、 waterfront areas have been ecologically sensitive areas under the background of constant advancement of urbanization; and constructing ecological circulation system and reshaping waterfront landscape environment have been top priorities. On this basis, it has studied the classification of landscape

18、 ecology and analysis of landscape pattern by taking Nanhudang Lake and the area 500 km within the lake as the research area. In view of different problems of the three landscape sub-zones of Nanhudang, different characteristic eco-landscape constructions have been conducted on each sub-zone accordi

19、ng to local conditions, so as to achieve the biological balance of waterfront areas, and efficient and harmonious sustainable development of waterfront landscape.Key words Waterfront areas, Landscape construction, Landscape ecology, Landscape patternWater is the source of life and an indis-pensible

20、part of human development. As human love water in nature, water can not only meet peoples material needs but also help achieve their spiritual pursuit. Water is not only a kind of precious resource, but also an excellent landscape, of vital significance to the development of waterfront areas. The ra

21、pid economic development in waterfront areas and the interference of human activities has brought positive and negative effects on water eco-system, that is, under the double actions of natural and human activities, some advantages have formed and a series of problems have been brought in water ecol

22、ogy of waterfront areas. Now, how to build an efficient, healthy and safe waterfront landscape has been a hot research topic.1 Concept and connotation of waterfront areaWater landscape includes water body landscape and waterfront landscape, which are all called as “waterfront landscape”1. When the c

23、oncept of waterfront area has been introduced into waterfront landscape construction, which refers to the area at the junction of water and land including water area, water border line and land area2, it should consider the dominant element of the environment composed of water and land to conduct la

24、ndscape construction. Landscape is the collection of different eco-systems in space and the gathering of several eco-systems close in space, mutually related in function and presenting certain characteristics in their interaction3. Landscape ecology aims to atudy the structure, function and change o

25、f landscape, and the planning and management of landscape4, Landscapeecology has provided a new thinking mode for landscape construction, that is, landscape ecological planning. Through the comprehensive analysis of landscape spatial pattern and landscape characteristics, the optimization scheme can

26、 be proposed for landscape planning.The development of waterfront area is closely related to local economic deve-lopment. From the perspective of researches on waterfront landscape construction, following problems are prominent in dom-estic landscape construction of waterfront area. First, it is lac

27、ked of an integrated consideration of the water area, water border area and land area. The current landscape construction is one- sided, and the whole waterfront area has not been taken intoFig.1 Division of Nanhudang Lake2 General satiation of the study areaNanhudang Lake is seated at Yangchenginte

28、grated consideration. Second, it is short of the analysis of landscape ecology and landscape pattern. Though some theoretical thoughts of ecology and landscape ecology have been gradually introduced into the construction of waterfront landscape, there isnt a set of systematic theory. Third, there is

29、 no quantitative analysis. The current landscape construction is primarily based qualitative analysis, without quantitative analysis and evaluation.Waterfront landscape construction is a complex and multi-objective systematic engineering5, should integrate knowledge and methods of architecture, geog

30、raphy, ecology and so on. Based on landscape ecology, waterfront landscape pattern should be analyzed, providing a reference for waterfront landscape construction.District on the southwest of Changshu City and it is a hot spot of classical water tourist areas. Shanghu Lake, Wangyu River, Nanhudang L

31、ake, Kuncheng Lake and Shajia River have constituted a characteristic water eco-tourism route of Changshu City. The paper has selected Nanhudang Lake and the area within 500 m along the lake as the study area.According to the pattern and water landscape of Nanhudang, it has been divided into three s

32、ections, and the base line of each section has been set (the base line is the basic framework organizing spatial sequence and also the linear structure relating each isolated landscape factor6) . The three sections have been analyzed and evaluated. First, the water quality of the first section is go

33、od, there exist some natural wetlands and beautiful pastoral scenery, but it is narrow. Second, the second section belongs to traditional agricultural land, with pretty scenery, peasant landscape, tranquil and limpid water. Some islands have been distributed sporadically. The surrounding natural env

34、ironment is good and this section becomes wide. Third, the third section is the eastern chemical industrial intensive area, where water pollution is serious and water quality is poor. Besides, the surrounding area of refuse landfill is ecologically sensitive.3 Study methods and contents3.1 Classific

35、ation of landscape ecology3.1.1 Principles for landscape classification. Landscape ecology classification refers that landscape eco-system should be classifiedTable 1 Common landscape pattern indexesClassificationIndexMeaningLandscape patchFractal dimensionMeasuring the complexity of the shapes of p

36、atchescharacteristic indexExtension indexRepresenting the difference between patches shapes and the round; the larger the index is, the longer thepatch is, largely different from the round, showing that the surrounding area of the patch is developedLandscape diversityDiversityComprehensively reflect

37、ing the abundance and homogeneity of landscape patches; the higher the value is,indexthe more abundant landscape types are, the more complex landscape structure isDominanceDescribing the dominance degree of one or several landscape patches in landscape pattern; the higher thevalue is, the larger the

38、 deviation is, that is, the proportion of each landscape type composing the landscapediffers largelyRelative homogeneous degreeDescribing the distribution evenness of each landscape typeLandscape spaceIsolation degreeRepresenting the separation degree of different patches in a certain landscape type

39、; the higher the value is,configuration indexthe more scattered regional landscapes in distribution are, and the higher the fragmentation isLandscape fragmentationIndicating the degree of landscape being separated, reflecting the interference of human activity to landscapeto a certain degree; when t

40、he value is 0, the landscape is not destroyed totally; when it is 1, landscape isdestroyed totallyFragmentation of landscape Reflecting the degree of one type of patch being interfered; the lower the value is, the larger the individualinternal habitatpatch is, reflecting that human interference is s

41、mallPatch densityReflecting the fragmentation of landscape being separated; the higher the value is, the larger patch densityis, the higher the fragmentation is3.2.2 Analysis of landscape pattern results. 3.2.2.1 Landscape patches characteristic index. As for Nanhudang, fractal dimension and extensi

42、on index of each patch have been from the perspective of function and structure, based on current materials and comprehensive analysis of natural feature, human activity and social economic condition of the study area through selecting classification indexes according to certain principles, referenc

43、es and targets. It is the foundation of landscape structure and function research, and also the precondition for the analysis of landscape pattern and planning, evaluation and management of landscape ecology.The premise of landscape pattern analysis is landscape ecology classification. In addition t

44、o the structure and functional principle of landscape ecology, and landscape dynamic principle, the classification of landscape ecology should also follow other principles7-8, which are comprehensiveness and dominance; target and practical principle; the combination of heterogeneity and homogeneity;

45、 the combination of quantitative and qualitative analysis; and the consistency of landscape function and ecological process. 3.1.2 Landscape ecology classification of Nanhudang. Land use situation of the study area has been digitalized on screen, then a landscape map has been made, and an attribute

46、database has been established. Land use map can be led to CAD. Through the figures, data and text materials, the patches division has been conducted on landscape ecology, so as to initially identify the scope selected, and the mean value has been and type of individual unit and construct a classific

47、ation system. Landscape ecology of Nanhudang has been classified into water landscape (including fishponds), agricultural land (including vegetation land), residential land, industrial landscape (including refuse land fill), and unused land (equal to the total area deducts above-mentioned lands).3.2

48、 Landscape pattern analysisLandscape is composed of patches of different sizes, and the spatial distribution of patches is called as pattern9. The qualitative description of landscape space pattern and heterogeneity is landscape pattern index which is the also the foundation to analyze the function

49、and process of landscape structure. In landscape pattern analysis, it can connect the spatial characteristics with time process of landscape, so as to clearly analyze and describe the inherent law of landscape.3.2.1 Landscape pattern index. Landscape pattern index refers to highly condensed landscap

50、e pattern information, which can be used to compare the difference between landscapes and the study areas. It is a simple quantitative index reflecting landscape structural composition and spatial disposition characteristics. As for the analysis of landscape pattern, it has proposed many indexes cur

51、rently. By combining with the actual situation of the study area, several indexes in Table 1 have been selected to study characteristics of waterfront landscape pattern calculated in Table 2. The value of fractal dimension of each landscape type is larger than 1, but close to 1, and their difference

52、 is not large, showing that these patches share a certain similarity and also this area has been interfered by human activity to a certain degree. The value of extension index of each patch is about 5. By combining with the land use map and the actual surveying materials, it is easy to find these la

53、ndscape patches are close to be round but not long and narrow; and their shapes are regular.3.2.2.2 Landscape diversity Index. Land-scape diversify index of waterfront area of Nanhudang (the mean value of the three sections) is 1.125. The value of landscape diversity of the third section is low, ind

54、icating that this section has no abundant landscape types and has a simple landscape structure. From the perspective of dominance (the mean value), it can be seen that the difference between maximum value and actual value of the diversity index of the third section is large, further showing that its

55、 landscape diversity deviates from the maximum diversity a lot, that is, the proportion of each landscape type differs a lot, or the landscape is dominated by a or several landscape types. Besides, the proportion of each landscape type in the other two sections doesnt differ largely, each landscape

56、distribution is even. The homogeneity further shows what have been illustrated above.3.2.2.3 Landscape spatial configuration. Among landscape types of waterfront area of Nanhudang Lake, landscape isolation of water landscape is smaller than that of agricultural land, followed by that of residential land and industrial landscape (Table 4). The isolation degree of industrial landscape is the largest, showing that industrial land