Abstract

The aim of the study is to assess concentrations of compounds of biogenic elements (nitrates, nitrites, ammonium, and phosphates) and to analyze their distribution in water bodies and watercourses of the forest-steppe, where beavers were reintroduced recently. The study was carried out in the State Nature Reserve Privolzhskaya Lesostep’ (Penza oblast). We studied beaver ponds, oxbows inhabited by beavers, and also uninhabited streams. The concentrations of biogenic compounds in water were measured twice a year at the beginning and the end of summer. The results showed that, in general, all water bodies were characterized by an excess of threshold limit value (TLV) of concentrations for ammonium (TLV 2 mg/L, an excess in 76% samples) and phosphates (TLV 3.5 mg/L, 64%). Excesses were less common for nitrites (TLV 3.3 mg/L, 28%) and quite occasional for nitrates (TLV 45 mg/L, 2%). Moreover, the differences between the concentrations of biogenic compounds in the water bodies inhabited by beavers and uninhabited waters did not have statistical significance. Significant differences were observed only for different types of water bodies, which was associated with their water regime. The presence or absence of beavers, as well as their density and abundance, did not lead to significant changes in the concentrations of nutrients. The studied water bodies were surrounded by territories with a high level of agricultural impact, and under these conditions, the effect of beavers on the concentration of nutrients was not observed.

中文翻译：

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海狸栖息的森林草原水体和溪流中生物化合物的浓度（Сastorfiber L.）

摘要

这项研究的目的是评估生物元素（硝酸盐，亚硝酸盐，铵和磷酸盐）的化合物的浓度，并分析其在森林草原水体和河道中的分布，最近又重新引入了海狸。该研究是在国家自然保护区Privolzhskaya Lesostep（奔萨州）进行的。我们研究了海狸池塘，被海狸居住的黄牛以及无人居住的溪流。夏季开始和结束时，每年两次测量水中的生物化合物的浓度。结果表明，总的来说，所有水体的特征都是铵盐（TLV 2 mg / L，76％样品中过量）和磷酸盐（TLV 3.5 mg / L， 64％）。亚硝酸盐（TLV 3.3 mg / L，28％），硝酸盐（TLV 45 mg / L，2％）很少。此外，海狸和无人居住的水所居住的水体中生物化合物浓度之间的差异没有统计学意义。仅在不同类型的水体中观察到显着差异，这与它们的水状况有关。海狸的存在与否以及它们的密度和丰度都不会导致营养物浓度的显着变化。所研究的水体被农业影响较高的地区所包围，在这种情况下，未观察到海狸对养分浓度的影响。在海狸和无人居住的水域中，水体中生物化合物的浓度之间的差异没有统计学意义。仅在不同类型的水体中观察到显着差异，这与它们的水状况有关。海狸的存在与否以及它们的密度和丰度都不会导致营养物浓度的显着变化。所研究的水体被农业影响较高的地区所包围，在这种情况下，未观察到海狸对养分浓度的影响。在海狸和无人居住的水域中，水体中生物化合物的浓度之间的差异没有统计学意义。仅在不同类型的水体中观察到显着差异，这与它们的水状况有关。海狸的存在与否以及它们的密度和丰度都不会导致营养物浓度的显着变化。所研究的水体被农业影响较高的地区所包围，在这种情况下，未观察到海狸对养分浓度的影响。海狸的存在与否以及它们的密度和丰度都不会导致营养物浓度的显着变化。所研究的水体被农业影响较高的地区所包围，在这种情况下，未观察到海狸对养分浓度的影响。海狸的存在与否以及它们的密度和丰度都不会导致营养物浓度的显着变化。所研究的水体被农业影响较高的地区所包围，在这种情况下，未观察到海狸对养分浓度的影响。