CCZO -- Soil Porosity, Soil Invertebrates -- Calhoun CZO -- (2015-2017)

Zachary Brecheisen, Dan Richter, Mac Callaham, Will Cook, and Paul Heine have sampled and analyzed soils from 15 locations in the Calhoun CZO. Sampling is underway, though all soil texture samples have been collected and are in process. The first quarterly invertebrate sampling occurred in September 2015. Bulk density, Ksat, and water stable aggregate sampling and analyses will occur in 2016. This work targets 3 different land forms: flat uplands, mid-slopes, and steeper slopes in 3 different land use comparisons. The land uses consist of 3 reference hardwood forests minimally degraded by human activity, 3 old-field secondary succession pine forests >60 yo, and 1 pseudo-replicated agricultural plot which has been, to the best of our knowledge, continually cultivated from the 1930’s at the latest. The goal of this sampling is to identify physical anthropogenic signals in the upper meters in the soil profile of cultivated lands and to evaluate their persistence or lack thereof in old-field pine forests relative to reference hardwoods.

Zachary Brecheisen、Dan Richter、Mac Callaham、Will Cook 和 Paul Heine 对位于 Calhoun 水文观测区（CZO）的15个地点的土壤进行了采样与分析。采样工作正在进行中，尽管所有土壤质地样本已收集并正在处理。首次季度无脊椎动物采样于2015年9月进行。2016年将进行总密度、饱和导水率及水稳性团聚体样本的采集与分析。本研究旨在针对3种不同的地形：平坦的上坡地、中等坡度以及3种不同土地利用比较中的陡峭坡地。土地利用包括3个受到人类活动最小程度退化的参考硬木林、3个>60年生的次生林老林 pine forests 以及1个伪复制的农业地块，据我们所知，该地块自20世纪30年代以来一直持续耕作。此次采样的目标是识别耕作土地土壤剖面上层米范围内的物理人类影响信号，并评估其在老林 pine forests 相对于参考硬木林的持久性或缺失情况。