关键词: 根茎禾草, 乳熟期, 净光合速率, 叶片温度

Abstract: Aimed to understand the effects of anthropogenic activities on the quality of the ground water in Liupanshui City of Guizhou Province, water samples were collected in dry and wet seasons, with their chemical composition, dissolved inorganic carbon (DIC), δ¹³C_DIC, and strontium isotopic composition analyzed. The main ions in the groundwater were Ca²⁺and HCO₃^-, followed by Mg²⁺ and SO₄^2-, being typical in karst area. The saturationindex of groundwater calcite (SI_calcite) had less change, and was negatively correlated with pCO₂, suggesting that the degradation of organic pollutants affected the waterrock interaction to a certain extent. The DIC content was higher in dry season than in wet season, while the δ¹³C_DIC did not change obviously. Isotopic and hydrochemical analyses indicated that the groundwater in town and farmland area was obviously contaminated by anthropogenic input. The ⁸⁷Sr/⁸⁶Sr in study area changed less, and its value in contaminated water was 0.7080. All the results suggestedthat the effects of anthropogenic input on the groundwater in Liupanshui City were dependent on the geological background, pollutant types, and hydrological conditions.

Key words: Rhizomatous grasses, Milky ripe stage, Photosynthetic rate, Leaf temperature