The Forest Landscape Pattern And Ecology Evoluation In Caijiachuan Forest Farm In Huanglong Mountain

Based on the image digitalization and secondary forest investigation data, with geographic information system, the landscape composition structure, distribution pattern, spatial relationships of the landscape ecological system and forest ecological system were analyzed systematically and evaluated currently. It provided the basis for the forest landscape pattern, ecological security and forest sustainable management in the CaiJiachuan forest farm in Huanglong Mountain. The main conclusions were as follows:1)The whole landscape elements were divided into nine types and the forest landscapes were divided into twelve types in CaiJiachuan forest farm in Huanglong Mountain. Woodland was mainly substrate and was dominant to control the landscape structure, function and the ecological security. The patches of farmland, preparation planting land, bush land, open land and cut land were in the form of mosaic.2)The average patch sizes of different landscape elements and patch grain-level structure were different, which reflected that they were in different ecological processes and disturbance situations. As a whole, the patch size of woodland was bigger than that of non-forest land and the patch shape had a very high variance. Generally, artificial control patches were relatively normal and natural ones were complex.3) There were high heterogeneity and fragmentation of the landscape and all heterogeneous factors were in the form of mosaic. With detailing division, the landscape diversity and evenness indices were very high. The effects of human disturbance on landscape diversity were ambiguity and the highest one was in the medium disturbance region.4) Because of the national policy and human disturbance, the area ratio and dominance of woodland all the time were highest and there was an accelerating trend of the woodland in area ratio way, suggesting that the regions were in the processes of landscape pattern and the forest ecological security stability improvement.5)Applied the landscape heterogeneity to evaluate the ecology security, the patch density index, the edge density index, the accumulation index and the dominance index were biggish contributed to the ecological security. The whole landscape was divided into four types and the forest landscape was divided into three types by the heterogeneity contribution rate. 6)There were some certain differences that the typical forest landscape was contributed to the whole landscape stability. The first forest landscape types that the Pinu stabulae forest and P. stabulae- Q. liaotungensis mixed forest were largest contributed to the whole stability, the third forest landscape type that the Betula platyphylla forest was the least contributed to the whole stability.