|关键词: 乡村生态设计 乡村生态景观识别 多尺度嵌套 长株潭绿心
|Application of Multi-Scale Ecological Analysis and Nesting in the Early Stage of Rural Landscape Planning: A Case Study of Tiaoma Area of Green Heart of Changsha-Zhuzhou Xiangtan
TIAN Jingwen,ZHU Ling,ZHANG Anxiao
|At present, there are frequent exchanges between urban and rural areas, and villages
and towns bear the overflow needs of many urban function construction, which leads to more
acute contradictions in the function, resources and environment of rural space. Demolition and
reconstruction was the mainstream of rural construction in the past few years. However, it has
been opposed. In the background of the context of integrated development of “three-life space”
in territorial spatial planning, the optimization and coordinated development of rural ecological
environment and living environment have become the main issues to be explored in the new era.
Building a multi-scale ecological network is the first step to solve the above problems.
Based on the three scales of “region-village-district” and the source-corridor method, the
ecological elements and networks at each scale are nested, the nesting characteristics are clearly
defined, the direction of rural landscape ecological planning is proposed, and an effective multi-scale
collaborative optimization path is concluded.
As for the scale of green heart of Changsha-Zhuzhou-Xiangtan urban and Tiaoma, the paper
identifies the spatial distribution of site three species based on ArcGIS platform, screens important
ecological source areas in combination with MSPA and InVEST models, then extracts ecological
corridors and ecological nodes based on circuit theory, and conducts nested analysis of ecological
structures under the scale of “green heart-Tiaoma”. It was determined that there were four common
sources of the two scales, with a total overlapping area of 26.48 km2
, accounting for 33.26% of
the source area of the green heart and 74.36% of the source area of the Tiaoma area. There are six
overlapping corridors between the two scales, with a combined length of 8.67 km, accounting for
19.3% of the corridor length in green heart area and 22.6% of the corridor in Tiaoma area. And
the common ecological sources basically overlaps with the ecological sources of Tiaoma area, and
the total corridor accounts for 46.84% of the total corridor length of the Tiaoma area within the
green heart scale. Common corridors and ecological sources are the focus to realize the connection
of different scales. A high proportion of common corridors indicates a high degree of connection
between the two scales, which can effectively promote the flow of ecosystems and promote the
stability of ecological networks. There are 14 unrecognized corridors in the Tiaoma area under the
green heart scale. They and the potential corridors within the green heart scale are areas with great
development potential, and their sorting and connection play an important role in the expansion of
ecological sources. There were two overlapping pinch points under the two scales, accounting for 11.76% and 10.53% of the pinch points in the green heart and Tiaoma areas respectively. There were six overlapping obstacle points, accounting for 26.09%
and 31.58% of the total obstacle points in green heart and Tiaoma area. The overlap degree of ecological nodes across scales is not high, indicating that
in future ecological optimization, attention should be paid to the transfer of ecological processes across scales to promote the flow of matter and energy.
Moreover, the protection of ecological pinch points and the restoration of obstacle points play an important role in the construction of the whole ecological
network on the green heart and even on a larger scale. For the protection and restoration of these two types of key nodes, the focus of ecological construction
is clearly defined to achieve the goal of efficient and sustainable ecological services.
For smaller typical areas, UAV mapping and field investigation methods commonly used in planning and design were used to obtain the details of
habitat type and distribution, vegetation type and structure, and water resources distribution, etc. In combination with large-scale ecological structure, small scale three-dimension data, and vegetation status of field investigation, four feasible points of ecological stepping stones were preset, and corridors were
identified again. The result shows that seven corridors have been added. It shows that small-scale ecological stepping stones can effectively increase the
number of ecological corridors and ecological pinch points, and promote the stable development of ecological network.
This study proposes the following ecological planning paths for rural landscapes: firstly, macro ecological network as a base to guarantee the stability
of ecological structure; secondly, ecological network nestingas a basis toprotect overlapping or optimise missing areas; thirdly, micro-scale upward thrusting
counterfactuals to improve regional ecological network; fourthly, multi-scalar ecological analysis linkage to stabilise the structure of rural landscapes. This
study not only provides a direction for rural landscape planning in the green heart of Changsha-Zhuzhou-Xiangtan urban but also summarises a landscape
planning approach based on multi-scale analysis and nesting can provide references for the development of rural landscape.
|Key words: Rural Ecological Design Rural Ecological Landscape Identification Multi-Scale Nesting Green Heart of Changsha-Zhuzhou-Xiangtan