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bpbond / cpcrw_incubation

PNNL TES incubation of CPCRW soil cores #openexperiment
http://bpbond.github.io/cpcrw_incubation
MIT License
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Check AL 12 10/27 mass data #17

Closed bpbond closed 9 years ago

bpbond commented 9 years ago

AL 12, a drought core, jumps from 2022 g on 10/26 to 2124 g on 10/27.

apeyton commented 9 years ago

Drought cores are dried down until they are ~5% moisture (by volume). Many of drought cores in the 20C chamber have been receiving water since mid-Sept. Only 2 drought cores the in 4C chamber have dipped below the 5% mark. After weighing the cores on 10/26, I noticed that water loss/volume for core 12 was 15.38% and adding 5ml of water would bring it back to 5% vl. moisture content. You may notice the same increase in AL9 (went from 1552.4 to 1558.8 from the 26th-27th). Weighing the cores regularly allows me to track how much water is lost to evaporation and adjust accordingly (based on treatment). Therefore, you may see some weights dip or peak if there are some days in between when I can measure (such as weekends/holidays) where more water is lost to evap (esp. in the 20C chamber). Thanks for noticing this. Despite our plan to maintain drought cores at 5% (as noted in the methods: "These groups included two incubation temperatures (4 °C and 20 °C) each with two moisture treatments: one in which soil moisture was maintained at field conditions (~28% moisture by volume), and a drought treatment in which no water was added and cores were allowed to dry down to ~5% moisture by volume.", it appears we may need to highlight/emphasize this better.

apeyton commented 9 years ago

Sorry - forgot to add: There is a typo. It's 2024g not 2124.

bpbond commented 9 years ago

Yay! OK, I will re-run scripts. Closing.