A vital method for constructing regional ecological security pattern:landscape ecological restoration and rehabilitation
GUAN Wen-Bin+1, XIE Chun-Hua+1, MA Ke-Ming+2, NIU Jian-Zhi, ZHAO Yu-Tao+1, WANG Xi-Lin+1 (1. Beijing Forestry University,Beijing 100083 China; 2. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China).
Ecological restoration and rehabilitation should be a multiple-scale project rather than be limited in a single ecosystem, and should include ecosystem or biota, landscape and even region. Landscape restoration and rehabilitation have become important due to widespread landscape degradation, including structure and function degradation. Landscape structure degradation, that is landscape fragmentation, is defined as the phenomenon that functional diversity relationships are ruptured or connectivity is reduced among ecosystems within the landscape. In addition, landscape aggregation, which has long been neglected, has negative effects on the landscape as well. Degradation of function is a loss or the degradation of stability and service functions due to a change in heterogeneity relative to a former state.Landscape reintegration means to restore contiguous relationships among ecosystems, which have been ruptured or fragmented by human activities. This ecological landscape reconstruction will improve functions of threatened or impacted ecosystems by adjusting and reconstructing landscape units' spatial structures; hence, primary productivity and stability are promoted, and landscape evolution influenced by human activities involves in virtuous circle, such as adjusting original landscape pattern, introducing new landscape elements. These two works are called landscape ecological restoration and rehabilitation, which is a vital method to construct a regional ecological security pattern. Its aim is to rebuild a model landscape consisting of several model ecosystems with reasonable structures, effective functions and harmonized relationships, so as to get healthy ecosystems, secure ecological pattern and sustainable landscape service. The method of GAP (A Geographic Approach to Protect Biological Diversity) supported by 3S (RS, GPS, GIS) technique provides an important tool of diagnosis, assessment and program of landscape restoration at a large scale. Degradation or destruction of certain strategic portions, positions or relationships among them has destructive consequences to ecological security. In order to establish a landscape restoration model by effective techniques and to build a regional ecological security pattern by means of strategic positions, it is increasingly attractive for ecological research to focuse on landscape scale degradation in structure and function originating from human disturbance; this is an issue of great concern. However, how to construct model landscapes effectively and determine the critical position for this end remains a tough question.
【Fund】： 国家重点基础研究资助项目 ( G2 0 0 0 4 680 7);; 国家自然科学基金资助项目 ( 30 1 70 1 80 )~~
【CateGory Index】： X171
【CateGory Index】： X171