Fire on the prairie

Fire plays an important role in many ecosystems, including the prairie. It cycles nutrients, clears out detritus that thwarts the sun’s rays from reaching young plants1, and directly stimulates germination of various fire-adapted species2. Many restoration efforts involve controlled burns.

An interesting consideration is the release of carbon involved in such activities. Could stewards be aiding one ecosystem at the expense of all others? Fortunately, the answer is a resounding no!! In fact, prairies may become a key carbon sink in our changing climate3.

How? Prairie plants send down deep roots. This underground growth sequesters a lot of carbon – and critically, it lies beyond the reach of flames. Toss in the spate of new growth that follows a fire, and the imbalance becomes clear: even when everything above goes up in smoke, a lot more carbon gets lost below.

1 Fire and Grazing in the Prairie – Tallgrass Prairie National Preserve (U.S. National Park Service)

2 Smoke Infusion for Seed Germination in Fire-adapted Species

3 Grasslands More Reliable Carbon Sink Than Trees

On mustard and cabbages

The genus Brassica contains many familiar food crops, but what’s remarkable is the scant number of species required to fill the produce section at the grocery store. Most are cultivars of the same species. While it may be less surprising that cabbage and Brussels sprouts or broccoli and cauliflower are so closely related, all four – along with kale and collard greens – are truly of the same species (Brassica oleracea).

Also found within the genus is Brassica rapa, which includes bok choy and turnips, and multiple species of mustard. Notably, we must take an additional step back into the broader Brassicaceae family to find the nearest link to yellow mustard. But still, how odd it is to think brown mustard, turnips, and cauliflower are such close relatives!