Since I have succeed in reinstalling the equipment, I set three goals for field trip this time:
(1) Check data of sap flow, band dendrometer and soil moisture.
(2) Measure tree heights and DBHs in Block 2 and 3.
(3) Measuring photosynthesis by Li-cor 6400 XT.
Before going to the field, I checked the condition of Li-cor 6400 XT, and was glad to find that it worked well, though it has not been in use since November last year. I also charge the batteries of Li-cor 6400 XT.
Adam, Dr. Wu and I went to the field on June, 14, 2017. It was a sunny day, not cold nor hot. On arrival, I brought my laptop and download the data, while Adam and Dr. Wu measured tree heights and DBHs in Block 2 and 3.
I was so sad to find that the No.3 tree did not give any sap flow signals, indicating a disconnection between tree No.3 and the datalogger. So I checked mainline of datalogger, the connectors were all connected. Then I went to B1T2 site where the No.3 tree was, to check the connection between sap flow probe and the extension line. It was connected, indicating that there might be broken in the middle of the wire.
The way to find out where was broken was very tough, because there were a bunch of wires connecting sap flow probes, band dendrometers and soil moisture from various trees, and to various extension cables in three plots . Identify the specific broken wire and the position needed at least two people, use electricity meter, section by section at those wires. Adam and Dr. Wu were all at Block 2 which is at least 30 meter away at that time, so I decided to put aside, and check for the other data.
Tree No. 1, 10 and 15 showed a wired sap flux pattern, though the data were in a normal range and shape. It seemed that the three trees has no any sap flowing through trunk at the day time, but transpired at the midnight. However, compared with other trees under the same treatment, the shape and the range were all similar. Thus, I did not think that there were connection problems in the three trees. Rather, I supposed that either trees responded abnormally, or the probes were dis-functional. I could not solve either of them, so I put them aside as well.
Only one band dendrometer worked well (Tree. No. 13). Then, I found that most problems came from a bad connection in the connector. This was the top lesson I learn at this field trip: DO NOT TRY TO DO SOMETHING BEYOND WHAT YOU HAVE MASTERED IN A IMPORTANT EVENT. The field experiment this year is so important to me, I will not be able to afford any failure. But I used a novel detachable connector which I just got to know one day before my field installation. I could not handle them well, but I applied them in all my band dendrometers connection. In fact, installing this novel connector consumed more time than that of an ordinary one. I should not use them at all until I mastered them. How stupid I was!!! Anyway, I cut the connectors off, and replace it with the ordinary ones and junction boxes.
Fig. 1 replacing detachable connectors with ordinary ones and junction boxes
So it took me double time to install the band dendrometers, let alone the expenses on them. I felt so sad… 🙁
Besides, one soil moisture sensor which is located at B1C at the depth of 40 cm gave negative value. After excluding the connection problems in the wire connecting to the datalogger, I thought it was a disconnection at the multiplexer inside the datalogger, by observing an apparent disconnected wire tip in it. However, I did not where channel should I put the tip into, so I took a photo and would ask Antonio for help.
Measure tree DBH and heights was time-consuming, too. Adam and Dr. Wu spent four hours on it. At around 2:30 pm, they came back and asked me about the connection. I was almost finishing replacing the connectors of band dendrometer. So I told them about the disconnection of tree No.3. To my surprise, they suggested to look at the probes first, by disengaging all the foil and foam isolations around it. This suggestion was really good! We found the wire of probe of tree No.3 was broken, as a result of pulling the short wire so hard in order to connect it to the mainline. So we tried our best to re-connect it. However, we failed.
Fig. 2 Broken sap flow probe in tree No.3
By the end of that day, we went home with pity. The only achievement today is that tree heights and DBHs in Block 2 and 3 were measured, and all connectors of band dendrometers were replaced. I did not measure photosynthesis as I planed. I hope that field trip next week could be better!
Extra bonus: Blue eggs turned into nesting. Do you know who they are?
This article has helped me to broaden my knowledge. Thank you!
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I love reading your blog. I always read all your articles. I feel like I’m experience your journey by my self.
A challenging, fnf mods, and educational field day – your perseverance despite the setbacks is admirable!
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This really highlights how much field research depends on the smallest hardware details. From a tech store perspective, connector choice and cable strain relief are often underestimated, yet they’re usually the first point of failure in long-term outdoor deployments. New or “improved” connectors can introduce more risk than benefit if they haven’t been tested under real conditions. Painful lesson, but a valuable one—reliability and familiarity often matter more than novelty when the data truly counts.
It’s a pleasure to read your blog. All of your articles are always read by me. I have the impression that I am melon playground traveling through your voyage by myself.
Fieldwork like ssmid portal always teaches tough lessons! Sounds like a tricky day with broken wires and unexpected probe behavior. Your takeaway about sticking to what you’ve mastered is so relatable, experience really is the best teacher.
Ouch, that sounds like a frustrating day in the field! At least you figured out the connector issue a good reminder to test and calculate new gear thoroughly before using it in critical experiments.
Fieldwork does not always go as planned, but it still sounds like you accomplished important tasks with the tree measurements and dendrometer maintenance. Sometimes progress comes in smaller steps than expected, and that is still valuable for long-term research. The surprise about the blue eggs also adds a fun and memorable moment to the trip. It reminds me of Slope Rider where even difficult runs can still teach you something useful for the next attempt.
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Interesting how field data collection can sometimes feel like detective work—especially when trying to trace a broken wire in a bundle of sensors. I’ve had similar frustrations with sap flow data gaps, but it’s always rewarding when persistence pays off. By the way, I’ve been exploring how AI Image to Video Generator tools could help visualize such complex field setups for training or troubleshooting purposes.
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The part about the detachable connectors really hit home for me — I’ve definitely been guilty of trying new gear in the field without testing it first, and it always backfires. That lesson about sticking with what you know for important setups is so easy to forget when you’re excited.
Great fieldwork update! Hope you get those sensors working properly for your next data collection. Lift off for a successful resolution!
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It’s always frustrating when field equipment throws unexpected issues like broken wires or odd sap flux patterns, especially after all the effort to get everything reinstalled. Your methodical troubleshooting—checking connections and planning for a multimeter search—shows great patience and attention to detail. I’m curious if the wired pattern you saw might be related to the broken sensor or a temporary environmental effect; would love to hear how you resolved it.
Dealing with tangled sensor wires in the field is such a pain—I don’t blame you for postponing the hunt. Sometimes just rethinking how you pair up and sequence tasks with best team formations can save hours of tracing breaks alone. Hope No.3 comes
The part about the detachable connectors really hit home. I’ve made the same mistake of trying out something new in the field without practicing first, and it always ends up costing way more time than it saves.
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This field note feels very real, especially the part where the bad connector setup turned into a full-day problem and the tree No. 3 signal issue finally traced back to a broken probe wire. The lesson about not using unfamiliar hardware during an important field event is a hard one, but it is exactly the kind of experience that makes the next trip smoother. For anyone turning a research recap or final field update into a polished wrap-up, read more.
Yesterday’s reading made me feel so relieved because the sap flux data showed a steady flow. But today, I’m back and there’s a new drama: signals are jumping around, sensors are malfunctioning, and some are completely broken. Doing research is just like managing a chain of stores in monkey mart – you’ve just gotten everything in order, you think you can relax and collect money, and then the supermarket runs out of stock, customers line up in long queues, and the staff starts dozing off.
Tracing a broken wire through that tangle of sensors sounds incredibly frustrating—section-by-section continuity checks are tedious but necessary. For logging field troubleshooting steps and data notes more efficiently, I’ve been using https://choicervoicer.app/ alongside my usual workflow, and it helps keep things organized. Hope the sap flux issue turns out to be a simple fix!
Finding a broken wire in that mess of sensors sounds like a real headache — I’ve been there with soil moisture arrays. But the midnight sap flux pattern is fascinating; maybe something to do with refilling stem storage? I recently read a helpful guide on wiring diagnostics at https://koeshindan.com/ that made me think of this. Hope the reconnection goes smoothly!
Interesting perspective. Thanks for sharing!
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Really enjoyed reading about your field trip and all the unexpected problems you had to deal with. The lesson about testing new equipment before an important experiment really stood out to me. It sounds like a tough day, but you clearly learned a lot from it. After such a long day in the field, a quick game of bitlife would be a fun way to unwind.
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The field trip shows how a single faulty connector can complicate an entire experiment, especially when many sap flow, dendrometer, and soil moisture wires converge across several plots. Your decision to replace the unfamiliar detachable connectors with ordinary ones and junction boxes is a practical lesson about testing equipment before an important installation. A similarly careful workflow can help when preparing files with mrpack converter before manual setup.