I took our Hubbard Fellows up to the Niobrara Valley Preserve in north-central Nebraska last week. While we were there, I spent quite a bit of time in the east bison pasture, where the recovery of prairie plants from last year’s summer wildfire was in full swing.
The lush green growth was in strong contrast to the burned prairie’s appearance back in late April when only a few sedges and yucca looked alive – and both were being cropped short by hungry bison.
We knew the prairie would survive the fire, but it was still good to see the quick strong growth after some nice rains this spring. The Preserve staff reduced the size of the east bison herd last year because more than 90% of the bison pasture had burned. The biggest concern was getting the bison through the winter with very little residual grass available to eat. With the help of a little fall growth and some supplemental hay, the bison survived just fine.
The drought and wildfire definitely weakened the vigor of perennial plants in the prairie, and there is a flush of annuals and other short-lived plants taking advantage of that this year. Species such as goosefoot (an annual Chenopodium species), annual sunflower (Helianthus petiolaris) and six-weeks fescue (Vulpia octoflora) are abundant throughout the grassland. At the same time, however, perennial plants such as prairie wild rose (Rosa arkansana), spiderwort (Tradescantia occidentalis), cutleaf ironplant (Haploppus spinulosus), and many more are having a great year too.
Besides the bison, we saw numerous other creatures throughout the prairie. I wandered through the area where I’d seen sharp-tailed grouse displaying back in May, and flushed up a couple birds. Upland sandpipers, western meadowlarks, and lark sparrows were all over the place. Insects, of course, were easy to find too, including a number of species feeding on the pollen of the ubiquitous flowers.
This spring brought a big new batch of bison calves, a testament to the toughness of the females, who were able to get through a hard winter of sparse brown grass and a little hay. There should be plenty to eat now – not only did the Preserve staff reduce the herd size to about 150 adults after the fire, they also increased the pasture size to about 10,000 acres. While the prairie grasses are still weak, that light stocking rate should give those plants plenty of opportunity to recover, depending upon the consistency of rainfall during the remainder of the season, of course. The staff will allow the herd size to grow again over the next few years, aiming for an eventual stocking rate of about 30 acres per animal.
In other news, the extent of erosion on the ridges where the pine woodland burned last year didn’t look any worse than the last time I was there. In addition to a lot of deciduous trees re-sprouting from their bases, we saw a fair number of oak trees with at least some leaves on last year’s branches – though it’s not clear whether they’ll actually survive long-term or not. Most importantly, we haven’t yet found any invasive plants moving into those burned woodland areas, which is good.
The burned woodlands will be significantly different – but fine – in the coming years. The prairies, however, have been able to absorb the impacts of the drought and wildfire without breaking stride.
It’s like they’ve done this before…