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Title: [Influence of landscape pattern on elevation effect of δ18O in surface water in Hani Terrace]. Author: Liu CJ, Jiao YM, Xu QE, Yang YF, Ding YP, Liu ZL. Journal: Ying Yong Sheng Tai Xue Bao; 2022 Apr; 33(4):1083-1090. PubMed ID: 35543063. Abstract: With the Quanfuzhuang River basin located at Hani Rice Terrace core region as study area, we analyzed the isotopic composition and the effects of 12 surface water sampling sites for the forest landscape type and terrace landscape type from May 2015 to April 2016. The results showed that: 1) For the variation of isotope composition, both the average value and the variation range of δ18O in surface water under forest patches were smaller than that under terrace patches. 2) The overall elevation effect of the hydrogen and oxygen stable isotopes in surface water was obvious, except that in August and March, which could be expressed as the linear regression equation δ18O=-0.012H+13.84 (r=-0.83, n=12). 3) The altitude gradient of δ18O in surface water was -1.2‰·(100 m)-1, which was not the true altitude gradient affected by precipitation but by landscape gradient of δ18O in surface water between forest patches and terrace patches. 4) Under the "Forest-Terrace" landscape pattern, the δ18O differences in surface water between forest patches and terrace patches enhanced the elevation effect. Therefore, when landscape heterogeneity was strong, isotopic effect was strengthened, even with opposite isotope effect. 本研究以哈尼梯田文化景观遗产核心区的全福庄河小流域为对象,对在2015年5月—2016年4月间逐月采集的森林景观类型和梯田景观类型下12个样点的地表水样品进行氢氧稳定同位素组成和效应分析。结果表明: 1)在地表水氢氧稳定同位素组成上,森林斑块δ18O平均值小于梯田斑块,森林斑块δ18O随时间的变化幅度也小于梯田斑块;2)研究区地表水δ18O除8月和3月外,均具有显著的海拔效应,其一元线性回归方程为:δ18O=-0.012H+13.84(r=-0.83, n=12);3)地表水δ18O海拔梯度为-1.2‰·(100 m)-1,但并不是受降水影响的“真”海拔梯度,而是森林斑块和梯田斑块间地表水δ18O景观梯度影响下的海拔梯度;4)在森林-梯田的景观格局组合下,森林斑块与梯田斑块间的地表水δ18O值差异增强了海拔效应。因此,当流域景观格局异质性强时,地表水稳定同位素效应会被强化或者出现完全相反的同位素效应。.[Abstract] [Full Text] [Related] [New Search]