Spatial-temporal change of DBH of Populus euphratica under artificial water conveyances
In order to assess the benefits of 14 times of ecological water transferring on floodplain forest ecosystems in the lower reaches of the Tarim River, the response of diameter at breast height ( DBH) of Populus euphratica to water transportation project is analyzed based on the long term field survey data obtained in last 10 years at Arghan section. The results showed that, with the increasing amount of transferred water to the lower reaches of Tarim River, the groundwater level around the riverbank has been raised, this result in the obvious increment of the P. euphratica DBH, however, due to the difference of water transferring time and the accumulation of transferred water in different time period, the DBH increment of P. euphratica showed various trend, DBH increment is greater when the accumulated transferred water is larger, the R2 of the exponential model between accumulated water and the DBH increment during each measuring period is 0.928. The regression analysis between the DBH increment and the distance from the river showed that with the increasing distance from the river and the decreasing groundwater level, the DBH increment reduced, the R2 of the regression model is 0. 965. The regression analysis between DBH increment of each DBH class of P. euphratica with the distance from the river showed that P. euphratica within smaller DBH distributed near to the riverbank showed greater DBH increment compared to the one distributed far from the riverbank, while, P. euphratica with bigger DBH increment displayed not obvious correlation with the distance from the river compared to the one with smaller DBH, R2 of the model for each DBH class are 0.876, 0.879, 0.849, 0.837, respectively.
Tarim Riverman-made water transferringPopulus euphraticaDBH-incrementecological restoration
国家科技期刊平台
NSTL
万方数据
维普
