Chemistry of rainfall and throughfall from El Verde and Bisley

Rain, throughfall, and stream water are collected weekly at the LEF sites listed below. Samples are collected by USDA Forest Service technicians Carlos Estrada in the field filtered in the lab by Miriam Salgado. These data sets begin as early as 1983; LTER sampling began in 1988. Rain and throughfall samples are the total catch for the week, and are exposed to field conditions for that time. No event sampling is conducted on a routine basis. Rain samples from WDEV are wet only from an automatically-closing collector that prevents any dry deposition (Aerochem Metrics NADP collector). RCEV and RCB are bulk or always-open collectors that receive dry deposition by sedimentation. All samples are measured for pH and conductivity, and then filtered (pre-combusted Whatman GF/F glass fiber filter) prior to further analysis. From 1983-1994 samples were cooled and returned to the San Juan chemistry laboratory for analysis. During those years, samples for NH4 and NO3 analyses were refrigerated continuously until analysis. Subsamples for NH4 analysis were also preserved with 1 molar H2SO4. From 1994 on, samples for NH4 and NO3 were frozen until analysis, were not acidified, and all analyses were conducted at the University of New Hampshire. Rain and Throughfall Sampling SitesDescriptions of LTER LUQ rain and throughfall weekly sample chemistry data from 1988 onwards. Chemical concentrations are recorded as mg/L or ug/L as appropriate. Values below detection limits are recorded as 1/2 the detection limit. Site Abbreviation Description Comments Rain collector Bisley. RCB Bulk collector. Rain collector El Verde RCEV Bulk collector. Wet/dry El Verde. WDEV. Wet only collector. Throughfall Bisley. TFB=TCB TF bulk 10-collector composite Bisley gap= BGAP, TF bulk 10-collector composite Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Service.

雨水、穿透雨和溪水每周在下文所列的卢基约实验林（LEF）站点采集。样本由美国农业部林务局（USDA Forest Service）技术人员Carlos Estrada在野外采集，Miriam Salgado在实验室进行过滤处理。这些数据集最早始于1983年；长期生态研究（LTER）采样始于1988年。雨水和穿透雨样本为每周的总捕获量，在此期间暴露于野外环境。未常规开展事件采样。WDEV站点的雨水样本仅来自自动关闭的采集器（可防止任何干沉降），该采集器为Aerochem Metrics公司的美国国家大气沉降计划（NADP）采集器。RCEV和RCB站点采用的是大容量或常开式采集器，通过沉降接收干沉降物。所有样本均测定pH值和电导率，随后在进一步分析前使用预燃烧的Whatman GF/F玻璃纤维滤膜过滤。1983年至1994年间，样本经冷却后送回圣胡安化学实验室分析。在此期间，用于NH4和NO3分析的样本持续冷藏直至分析。用于NH4分析的子样本还使用1摩尔浓度的H2SO4保存。1994年起，用于NH4和NO3分析的样本冷冻保存直至分析，未酸化，且所有分析均在新罕布什尔大学进行。雨水与穿透雨采样站点：1988年起长期生态研究卢基约（LTER LUQ）站点雨水与穿透雨每周样本化学数据描述。化学浓度根据情况记录为mg/L或μg/L。低于检测限的值记录为检测限的1/2。站点缩写 描述 备注
Bisley雨水采集器：RCB（大容量采集器）
El Verde雨水采集器：RCEV（大容量采集器）
El Verde湿/干采集器：WDEV（仅湿采集器）
Bisley穿透雨采集器：TFB=TCB（10个采集器复合的穿透雨大容量采集器）
Bisley间隙：BGAP（10个采集器复合的穿透雨大容量采集器）
本研究得到美国国家科学基金会（National Science Foundation）授予波多黎各大学的多项资助（项目编号：BSR-8811902、DEB-9411973、DEB-9705814、DEB-0080538、DEB-0218039、DEB-0620910、DEB-1239764、DEB-1546686及DEB-1831952），这些资助属于卢基约长期生态研究计划的一部分。额外支持由波多黎各大学及美国农业部林务局（USDA Forest Service）热带林业国际研究所提供。