how do i use multiple colormaps and ranges in automated subplots

I have a loop that generates even (aday) and uneven subplots (hday). Even subplots have colormap 'winter' and uneven subplots have colormap 'summer'.

Certain pixels represent land and have a fixed value (-1), these values should be represented in black.

also, the range of the colormaps should be adaptable. I didn't manage to get caxis working on the two different color maps.

    cmap1 = winter;
    cmap1(1:6,:) = zeros(6,3);  %makes 0 values black -> should be adapted to make negative values black

    cmap2 = summer;
    cmap2(1:6,:) = zeros(6,3);  %makes 0 values black -> should be adapted to make negative values black
    
for k1 = 1:10
     
    %even subplots
    im_yr = 2000 + k1 -1;
    aday = load(['results\res_arrivals_',num2str(im_yr)]);  %load the arrival time image
    
    sbpl = k1 *2;   %calculate subplot nr
    a{k1}=subplot(5,4,sbpl);
    imagesc(aday);
    axis off
    colormap(a{k1}, cmap1);

    
    %uneven subplots
    hday = load(['results\res_harvest_',num2str(im_yr)]); %load the harvest time image
    hday = cell2mat(struct2cell(hday));

    sbpl = k1*2-1;
    h{k1}=subplot(5,4,sbpl);
    imagesc(hday);
    axis off
    colormap(h{k1}, cmap2);
end

[bstechel]

This is where I'm at the moment. Values should range between 0 and 365. The current range is somehow automatically implemented.