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| 1 | 极端干旱区不同水分条件下胡杨林生态耗水特征显示文摘以极端干旱区胡杨林为研究对象,探究不同水分条件下胡杨林土壤水分运动规律和胡杨生态耗水特征。结果表明:HYDRUS-1D模型对极端干旱区胡杨林土壤水分运动和蒸散发过程具有良好的模拟效果。不同水分条件下胡杨林土壤水分运动特征和生态耗水变化差异明显。随着下垫面水分条件趋于湿润,土壤水分含量和湿润锋入渗深度均出现增加,入渗深度分别达到100,120,150cm。下垫面水分条件改变导致土壤水分存蓄情况发生变化。下垫面水分补给增加的同时胡杨林蒸散发呈明显增加,其中植被蒸腾增加显著。随着水分条件逐渐湿润植被蒸腾占总蒸散比例由55%升至65%。研究显示,随着下垫面水分条件逐渐湿润,极端干旱区胡杨林生态耗水量逐渐增加,其中植物蒸腾消耗是造成水分耗散增加的主要原因。 | 张瑞文 赵成义 王丹丹 施枫芝 郑金强 | 2019 | 水土保持学报2019，33，4： | 10 |
| 2 | Spatio-temporal Variability of Soil Water at Three Seasonal Floodplain Sites: A Case Study in Tarim Basin,Northwest China显示文摘The floodplain vegetation of the Tarim River in Northwest China is strongly influenced by irrigated agriculture. The abstraction of river water disturbs the natural dynamics of the floodplain ecosystem. The human impact on the hydrological system by bank dams and the irrigation of cotton plantings have caused adverse changes of the Tarim River and its floodplains, so the current stocks of the typical Tugai vegetation show significant signs of degradation. Field studies of soils and statistical analysis of soil moisture data have shown that the vitality of the Tugai vegetation is primarily determined by its position to the riverbank and the groundwater. There exist complex interactions between soil hydrological conditions and the vitality of the vegetation. But the availability of water is not only influenced by the groundwater level and seasonal flood events. The spatial distribution of stocks at different states of vitality seems also to be decisively influenced by physical soil properties. Our results show that the water supply of plant communities is strongly influenced by the soil texture. Spatial differences of soil moisture and corresponding soil water tensions may be the decisive factors for the zonation of vegetation. Physical soil properties control the water retention and rising of capillary water from deeper soil layers and the phreatic zone and may supply the root systems of the phreatophytic vegetation with water. | Sven GRASHEY-JANSEN Martin KUBA Bernd CYFFKA müt HALIK Tayierjiang AISHAN | 2014 | Chinese Geographical Science2014，24，6： | 3 |
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