Abstract The interpretation of the potential impacts of anthropogenic activities on water quality is essential in order to manage the suitability of land uses, particularly in the case of Eucalyptus plantations. The aim of this study was to evaluate the precipitation, interception, and evapotranspiration of Eucalyptus plantations at the catchment scale (719 ha; clayey soil) for a period of over 2 years (2008–2011) in the Riacho Fundo Watershed (Felixlândia, Minas Gerais, Brazil). The possible relationships between streamflow, evapotranspiration, and net precipitation were also evaluated as a basis for taking management decisions and choosing future modeling options. Rainfall and evapotranspiration were measured with two rain gauges and two evapotranspirometers, respectively. A triangular weir and a levelogger/barologger were used for the streamflow measurements. Net precipitation was calculated through six plots in which throughfall and stemfall were measured. The rainfall showed values close to the expected average for the region (approximately 1,100 mm). Rainfall interception by the Eucalyptus crop in the period was approximately 12% of the gross precipitation, whereas the monthly runoff coefficient was of 38%. Average streamflow during the study period was 37.8 l s−1, having reached 18.3 l s−1 in the dry season and 51.4 l s−1 in the rainy season. These features illustrate the intra-annual variation of streamflow. No significant linear correlations were found between runoff and precipitation, which indicates the need of more complex models to include the occurrence of lagging effects of precipitation on the streamflow and the impact of the management.

中文翻译：

---

米纳斯吉拉斯州桉树种植园流域的水文平衡（巴西）

摘要 人为活动对水质的潜在影响的解释对于管理土地利用的适宜性至关重要，特别是在桉树种植园的情况下。本研究的目的是评估在 Riacho Fundo 流域（Felixlândia，Minas）超过 2 年（2008-2011 年）流域规模（719 公顷；粘土）的桉树人工林的降水、截留和蒸散量。吉拉斯，巴西）。还评估了流量、蒸散量和净降水之间可能的关系，作为做出管理决策和选择未来建模选项的基础。降雨量和蒸发量分别用两个雨量计和两个蒸发量计测量。三角堰和液位计/气压计用于流量测量。净降水量是通过六个地块计算的，其中测量了穿透量和茎量。降雨显示值接近该地区的预期平均值（约 1,100 毫米）。在此期间，桉树作物截留的降雨量约为总降雨量的 12%，而月径流系数为 38%。研究期间的平均流量为 37.8 ls-1，旱季达到 18.3 ls-1，雨季达到 51.4 ls-1。这些特征说明了水流的年内变化。径流和降水之间没有发现显着的线性相关性，