Data for: The dissolved carbon fluxes in an erosion landscape vegetation restoration area

The data were got by the field observation in 2016 and 2017. The observation time was the growing season in this region.Four runoff plots were set up on the hill-slopes with vegetation cover of Robinia pseudoacacia (A, 2×10 m), Spiraea salicifolia (S, 2×10 m), Stipa bungeana community (H, 3×10 m), and a bare soil (CK, 3×10 m). The vegetation community characteristics in each plot are listed in Table 1. All the plots had similar slope gradients of about 20°. Each runoff plot was surrounded by polyvinyl chloride (PVC) boards. The boards embedded into the soil (500 mm deep) were used to separate the sediment yield and surface runoff in and out of the plots. At the bottom edge of each runoff plot, a U shape PVC runoff gathering pit was installed to transfer the surface runoff to a collecting bucket. In total, 19 rainfall events were recorded between June and October in 2016 (nine rainfall events) and 2017 (ten rainfall events). The rainfall events were numbered from number 1 to number 19 on the basis of the sampling dates. After each rainfall event, the surface runoff volume (R) from each plot was measured and the runoff accumulated in buckets was collected in 250 mL plastic bottles (then chilled at 4 °C in a refrigerator) for monitoring the dissolved carbon concentration in runoff. This dissolved carbon concentration in runoff includes the dissolved organic carbon concentration and the dissolved inorganic carbon concentration. One set of simple rain gauges was installed in each of the plots that had no rainfall interception (H and CK). For the plots under the woody vegetation cover (A and S), six sets of simple rain gauges were installed for collecting throughfall. After each rainfall event, the rainfall or throughfall volume (P) was measured and collected in a plastic bottle (250 mL) and kept in refrigerator (4 °C) for later measurement of the carbon concentration in rainfall, including the dissolved organic carbon concentration and the dissolved inorganic carbon concentration, in the laboratory. After each rainfall event, the soil water sampler installed was used for collecting soil infiltration water. The Model 1900 Soil Water Sampler used in the experiment came fully assembled. This instrument is a large-volume sampler designed for near-surface installation at 50 mm depth in a study. Two sets of soil water samplers were installed in each plot, one was 2.5 meters from the top edge of the plot and one was 7.5 meters from the top edge. The infiltration water samples collected were put in plastic bottles (250 mL) and kept in a refrigerator (4 °C) for later measurement of the carbon concentration of the infiltration water, including the dissolved organic carbon concentration and the dissolved inorganic carbon concentration. The infiltration volume (I) in each plot was calculated through the water balance equation for each rainfall event (P=R+I).本数据集来源于2016年与2017年的野外实地观测，观测时段为该区域的植物生长季。 本研究在坡地设置了4处径流小区，各小区的植被覆盖类型分别为刺槐（Robinia pseudoacacia）（记为A，规格2×10 m）、柳叶绣线菊（Spiraea salicifolia）（记为S，规格2×10 m）、长芒草（Stipa bungeana）群落（记为H，规格3×10 m）以及裸土对照小区（CK，规格3×10 m）。各径流小区的植物群落特征详见表1。所有小区的坡度基本一致，均约为20°。每个径流小区四周均布设聚氯乙烯（PVC）板，该板埋入土中深度达500 mm，用于分隔小区内外的产沙与地表径流。在每个径流小区的底部边缘，安装有U型PVC集流槽，用于将地表径流引导至集水桶中。 2016年6月至10月共记录到9次降雨事件，2017年同期记录到10次，累计19次降雨事件。所有降雨事件按照采样日期依次编号为1至19。每场降雨事件结束后，测定各径流小区的地表径流量（R），并将集水桶中收集的径流分装至250 mL塑料瓶中，随后置于4℃冰箱冷藏，用于检测径流中的溶解性碳浓度。径流中的溶解性碳浓度包括溶解性有机碳浓度与溶解性无机碳浓度。 对于无降雨截留的小区（H和CK），各布设1套简易雨量计；对于木本植被覆盖的小区（A和S），各布设6套简易雨量计以收集穿透雨。每场降雨事件结束后，测定降雨量或穿透雨量（P），并将其分装至250 mL塑料瓶中，置于4℃冰箱保存，用于后续实验室检测降雨中的溶解性有机碳与溶解性无机碳浓度。 每场降雨事件结束后，利用布设的土壤水采样器采集土壤入渗水。本实验采用的1900型土壤水采样器为预装式设备，属于大体积采样器，专为埋设于50 mm深度的近地表环境设计。每个径流小区内安装2套土壤水采样器，一套位于距离小区顶部边缘2.5 m处，另一套位于7.5 m处。采集的入渗水样品分装至250 mL塑料瓶中，置于4℃冰箱保存，用于后续检测入渗水的溶解性有机碳与溶解性无机碳浓度。各小区的入渗量（I）通过每场降雨事件的水量平衡方程（P=R+I）计算得到。