关键词: 民勤, 荒漠植被, 滴灌, 恢复, 光合生理, 林地水分

Abstract: Experimental research on degraded Haloxglon mmodendron and Nitraria tangutorum vegetation restoration at the edge of Minqin oasis was conducted through the application of irrigation technology. Following results have been obtained: (1) The degraded Haloxglon mmodendron and Nitraria tangotorum vegetation could grow well through application of drip irrigation. Comparing with those without drip irrigation, the length, amount and biomass of new branches of Haloxglon mmodendron could be increased by 1.3~1.5 times, 1.1~1.2 times and 1.5~1.8 times, respectively; the tree crown, amount of leaves and biomass of Nitraria tangutorum were increased by 1.9~2.8 times, 1.6~2.2 times and 2.8~6.5 times, respectively. (2)The photosynthetic physiology of Haloxglon mmodendron and Nitraria tangotorum became strong. In contrast with CK of no irrigation, under the irrigation quota of 100 m3·hm-2 and 150 m3·hm-2, the photosynthetic rate of Haloxglon ammodendron were raised by 1.30 μmol·m-2·s-1 and 3.42 μmol·m-2·s-1, and that of Nitraria tangutorum raised by 0.76 μmol·m-2·s-1 and 1.35 μmol·m-2·s-1 under the irrigation quota of 200 m3.hm-2 and 300 m3\5hm-2. The photosynthetic rate of vegetation under drip irrigation will become bigger with the increase of irrigation quota. (3) Water condition in the soil of the irrigated forest has been greatly improved. In the soil within 0~250 cm thick, the moist of Haloxglon mmodendron forest land was 3.07%~3.34％, 1.0%~1.3% higher than that without irrigation; that of Nitraria tangotorum forest land was 2.76%~4.43％, with an increase of 0.7%~2.3% comparing with that without irrigation.

Key words: Minqin, desert vegetation, drip irrigation, vegetation restoration, photosynthetic physiology, moist of forest land