# Metadata for Jianfengling_CHINAROOTS_TissueNutrients.csv
# Author & Data Collector: J. Aaron Hogan (jamesaaronhogan@gmail.com)

# 6-17-2019
# Description: Data are concentrations of elements in root and leaf tissues for 300 tropical saplings from Jianfengling, Hainan Island, China.  Sampling took place during the summer (May-July) of 2017.  Entire root systems (containing 3-4 root orders) were excavated from lateral surface roots and leaves were collected from juvenile trees along a 6.6 km transect spanning secondary and primary forest.  Plant organs were dried until constant mass at 65 deg C.  Dried organs were homogenized in a beadmill (Fisher Beadmaster 24).  Samples were micro-weighed (1-2 mg) for gas chromatography elemental analysis measurement of carbon and nitrogen on a Thermo Delta Plus GC-IRMS at the Florida International University stable isotope lab.  The remainder of the ground tissues were sent to the Louisiana State University Ag Lab (see http://stpal.lsu.edu), for quantification of Aluminum, Boron, Copper, Iron, Magnesium, Manganese, Molybdenum, Phosphorus, Potassium, Sulfur, and Zinc using inductively coupled plasma optical emission spectroscopy.  

* Data were measured in percent (%) or parts per million (ppm) elemental concentrations per tissue dry weight.  

# Variable descriptions:
Sample - Jianfengling collection number
Family - plant family
Gen.sp - plant species (in the form Genus_species)
type - organ type, either root or leaf.
forest - forest type where the plant was sampled on the transect (either secondary or primary)
Nitrogen % - percent Nitrogen in plant organ tissue.	
Carbon % - percent Carbon in plant organ tissue.	
Aluminum, ppm - parts per million Aluminum in plant organ tissue.
Boron, ppm - parts per million Boron in plant organ tissue.	
Calcium % - percent Calcium in plant organ tissue.	
Copper, ppm - parts per million Copper in plant organ tissue.		
Iron,ppm - parts per million Iron in plant organ tissue.	
Magnesium % - percent Magnesium in plant organ tissue.		
Manganese, ppm - parts per million Manganese in plant organ tissue.		
Molybdenum, ppm - parts per million Molybdenum in plant organ tissue.  NA signifies that concentrations were too low to measure. 
Phosphorus % - percent Phosphorus in plant organ tissue.		
Potassium % - percent Potassium in plant organ tissue.		
Sodium, ppm - parts per million Sodium in plant organ tissue.	
Sulfur % - percent Sulfur in plant organ tissue.		
Zinc, ppm - parts per million Zinc in plant organ tissue.