Su Peng-Yan, Zhang Ming-Jun, Wang Sheng-Jie, Qiu Xue, Wang Jia-Xin, DU Qin-Qin, Guo Rong, Che Cun-Wei
College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China.
Ying Yong Sheng Tai Xue Bao. 2020 Jun;31(6):1835-1843. doi: 10.13287/j.1001-9332.202006.022.
As plant species for riparian ecological restoration in northern China, Tamarix ramosissima and Salix matsudana play an important role in river protection, flood control, regional climate regulation, and landscape construction of riparian vegetation. Two sampling sites were selected in the riparian zones along the Lanzhou section of Yellow River, where plant xylems and potential water sources were collected. The direct comparison method, Bayesian mixture model MixSIAR and the proportional similarity index (PS index) were used to determine the proportions of water utilization for each potential water source and the relationship of two species in water utilization. The results showed that shallow soil (0-30 cm) was the main water source during growing season, with utilization ratio being 28.3% for T. ramosissima and 24.4% for S. matsudana. For T. ramosissima, river water had the lowest contribution (16.6%), and for S. matsudana, groundwater contributed the least (17.9%). In the months with low soil moisture, plants increased the utilization ratios of river water and groundwater. The PS index at the sampling site S and S was 91.0% and 87.7%, respectively. On a monthly basis, the index in May was the highest, indicating an inter-month divergence in water use relationship. At the floodplain, there were even utilization ratios for each potential water source, which is an optimal strategy to obtain water from each potential source to the maximum extent. Our results provided theoretical basis for riparian tourism development along the Lanzhou section of the Yellow River and plant water management in environment protection in the Yellow River Basin.
作为中国北方河岸生态修复的植物物种，多枝柽柳和旱柳在河流保护、防洪、区域气候调节以及河岸植被景观建设中发挥着重要作用。在黄河兰州段沿岸的河岸带选取了两个采样点，采集了植物木质部和潜在水源。采用直接比较法、贝叶斯混合模型MixSIAR和比例相似性指数（PS指数）来确定每种潜在水源的水分利用比例以及两种植物在水分利用方面的关系。结果表明，浅层土壤（0 - 30厘米）是生长季的主要水源，多枝柽柳的利用比例为28.3%，旱柳为24.4%。对于多枝柽柳，河水的贡献最低（16.6%），对于旱柳，地下水的贡献最小（17.9%）。在土壤湿度较低的月份，植物增加了对河水和地下水的利用比例。采样点S和S处的PS指数分别为91.0%和87.7%。按月来看，5月份该指数最高，表明水分利用关系存在月际差异。在河漫滩，每种潜在水源的利用比例较为均衡，这是从每种潜在水源获取最大程度水分的最优策略。我们的研究结果为黄河兰州段沿岸的河岸旅游开发以及黄河流域环境保护中的植物水分管理提供了理论依据。
