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Beijing Forestry University (2005)

Research on Sand Fixing Vegetation Restoration and Reconstruction

李慧卿; Li Hui Qing

Titre : Research on Sand Fixing Vegetation Restoration and Reconstruction

Auteur : 李慧卿; Li Hui Qing

Grade : Doctoral Dissertation 2005

Université : Beijing Forestry University

Résumé partiel
Vegetation in half fixed dunes outside the oasis plays important role in decreasing damage of sand and protecting oasis, which is one of the main objects in sand fixing vegetation restoration and reconstruction researching. In addition, the conclusion of artificial sand fixing vegetation researching missing long period investigation and analysis is doubtful.The paper analyses the natural Ammopiptanthus mongolicus communities, Nitraria tangutorum Communities and Artemisia Ordosica Communities in the half fixed dunes outside the oases irrigated by Huanghe River and well water respectively (hfdoiHR & hfdoiww) and the artificial vegetation planted two decades ago on the north east of Ulanbuhe desert. Belt (transect) composed of contiguous (abutting) quadrats is used in sampling, in which the cover of each species is estimated. Due to aiming at the multi-species pattern of shrub and grass, grass species is mainly considered in deciding the size of quadrat and the shrub species’ needs are meet by lengthening the belt (transects). Making use of the methods of multi-scale ordination modified by Ver Hoef & Glenn-Lewin (1989), the pattern intense and pattern consistency index and the contribution of species to pattern Dale & Zbigniewicz (1995) put forward, and the moving weight average quadrat scores (Noy-Meir & Anderson) etc., the paper contrasts the vegetation pattern characters in half fixed dunes outside the Huanghe River irrigating oasis and the well water irrigating oasis, analyses the relation between vegetation and sand height and the structure of artificial vegetation after two decades of succession. The purpose of the paper is to provide the base data for sand fixing vegetation restoration and reconstruction in the area. The results show that :(1) Most patterns of the two Ammopiptanthus mongolicus communities in hfdoiHR & hfdoiww are multi-species shrub patterns and the contribution of grass species to pattern isvery low. The patterns of Ammopiptanthus mongolicus communities in hfdoiHR are mainly shrub patterns controlled by Artemisia Ordosica and Ammopiptanthus mongolicus, besides some shrub patterns controlled by Ammopiptanthus mongolicus, Nitraria tangutorum, Artemisia Ordosica and Artemisia sphaerocephala. The patterns of Ammopiptanthus mongolicus communities in hfdoiww are shrub pattern controlled by Nitraria tangutorum and Ammopiptanthus mongolicus.

Mots clés : multi-species and multi-scale pattern; contribution; pattern intense; pattern consistency; oasis; artificial vegetation;

Présentation (CNKI)

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