NBS01 Belowground Plot Experiment: Soil water chemistry from Lysimeters

To address the potential interactive effects of fire, aboveground biomass removal, and nutrient amendments on above- and belowground responses, a long-term field experiment was initiated in 1986 as part of the Konza Prairie Long-Term Ecological Research (LTER) program. The general goals of this experiment are: 1) to document both short- and long-term responses of plants and soils to fire, aboveground biomass removal (a surrogate for grazing in these small plots), and nutrient amendments (additions of N and/or P); and 2) to provide a better understanding of the mechanisms underlying tallgrass prairie responses to fire, aboveground biomass removal and nutrient enrichment. Soil water nitrogen composition is measured using porous cup lysimeters from samples from nitrogen fertilized and control plots. Measurements include nitrate, ammonium, phosphate, and organic nitrogen and phosphorus

为探究火灾、地上生物量移除与养分添加对地上及地下生态响应的潜在交互效应，1986年依托康扎草原长期生态研究（Long-Term Ecological Research, LTER）计划启动了一项长期野外定位实验。本实验的总体目标包含两项：其一，记录植物与土壤在火灾、地上生物量移除（该处理可作为小型样地中放牧行为的替代方案）以及养分添加（施加氮[N]和/或磷[P]）条件下的短期与长期响应；其二，深化对高草草原响应火灾、地上生物量移除及养分富集的内在机制的认知。研究采用多孔杯渗漏计（porous cup lysimeters）采集施氮样地与对照样地的土样，用以测定土壤水氮组成，检测指标涵盖硝酸盐、铵盐、磷酸盐以及有机氮与有机磷。