Yadav Amita, Pandey Jitendra
Ganga River Ecology Research Laboratory, Environmental Science Division, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
Bull Environ Contam Toxicol. 2017 Jul;99(1):75-82. doi: 10.1007/s00128-017-2108-4. Epub 2017 May 17.
Carbon, nitrogen and phosphorus inputs through atmospheric deposition, surface runoff and point sources were measured in the Ganga River along a gradient of increasing human pressure. Productivity variables (chlorophyll a, gross primary productivity, biogenic silica and autotrophic index) and heterotrophy (respiration, substrate induced respiration, biological oxygen demand and fluorescein diacetate hydrolysis) showed positive relationships with these inputs. Alkaline phosphatase (AP), however, showed an opposite trend. Because AP is negatively influenced by available P, and eutrophy generates a feedback on P fertilization, the study implies that the alkaline phosphatase can be used as a high quality criterion for assessing river health.
沿着人类压力不断增加的梯度，对恒河中通过大气沉降、地表径流和点源输入的碳、氮和磷进行了测量。生产力变量（叶绿素a、总初级生产力、生物源二氧化硅和自养指数）以及异养作用（呼吸作用、底物诱导呼吸作用、生物需氧量和荧光素二乙酸水解）与这些输入呈现出正相关关系。然而，碱性磷酸酶（AP）却呈现出相反的趋势。由于碱性磷酸酶受到有效磷的负面影响，且富营养化会对磷的施肥产生反馈作用，该研究表明碱性磷酸酶可作为评估河流健康状况的高质量标准。
