Differences in Drought Adaptability between Artificial Mixed Forest and Pure Forest in Loess Plateau of Northern Shaanxi
In order to reveal the response of radial growth of mixed forest and pure forest to climate change and the difference in adaption to extreme drought in the Loess Plateau,the mixed forest and pure forest of Pinus tabulae formis and Robinia pseudoacacia in the typical hilly area of the Loess Plateau were studied.Based on the Palmer Drought Index(PDSI),two extreme drought events in 2005-2009 and 2019 were selected.Using 156 tree-ring cores,tree-ring width chronologies of four stands were established and the resistance and resilience of trees were quantified.The results showed that the annual ring width of P.tabulaeformis mixed forest was significantly higher than that of pure forest in the years of extreme drought events and suitable climate years.However,the annual ring width of Robinia pseudoacacia pure forest was significantly higher than that of Robinia pseudoacacia mixed forest.In terms of climate response,PDSI has a stronger effect on the radial growth of Pinus tabulaeformis pure forest and mixed forest than Robinia pseudoacacia.The resistance of Robinia pseudoacacia mixed forest to drought was significantly higher than that of Robinia pseudoacacia pure forest and Pinus tabulaeformis forest,and there was no significant difference in the resilience of the four forests.The results of this study showed that the mixed forest model significantly improved the adaptability of R.pseudoacacia to drought,and the construction of R.pseudoacacia mixed forest will help to improve the adaptability of plantations in the Loess Plateau to increasingly arid environments.
国家科技期刊平台
NSTL
万方数据
