Welcome to the forums!

First off, can you post some pictures? And add some history of when it was planted, was it a potted plant? What methods were used for planting, how it was cared for and was there any harsh winters or drought conditions? What time of year did you plant?

When you say 'I think it has anoxia, what should I do' is like saying ' my car is making a noise, what's wrong?

Adding your growing zone is another important piece of information that will help getting answers that are relevant.

Same question from same poster on a similar thread;

https://www.gardenweb.com/discussions/6512949/i-need-hinoki-cypress-help#n=19

I saw that too GG but when I tried to find it again, it appears it was deleted.

OK, I see now that Lauras first comment was piggybacked onto someone elses thread,

https://www.houzz.com/discussions/6512949/i-need-hinoki-cypress-help

I tried for an hour to upload the picture of the tree but it just wouldn't...I planted it on the east side of my house in Atoka TN zone 8a in early spring of 25...it was about a foot and a half tall..now it's about double the size ...we had a dry spring...a VERY wet July and a drought since the end of July..I noticed the browning at the bottom and it's moved up the tree now...the brown needles at the bottom are a little crispy now and the rest are still soft. I will try again to upload the current picture. Thank y'all for trying to help me with this!

I'm still trying to upload the photo...does anybody know the trick to that?

If you're on your phone, there should be a button that says photo, lower left bottom above the 'Submit' button in your comment. Pick only one picture at a time, then hit the done button.

If you are still around, photos have to be JPEGs. There was a time when my phone switched to HEIC format, and nothing would post until I changed it.