Annual plant growth on sand and loess.xlsx

In the Negev Desert, near-weekly measurements were carried out during 2012-2016 (with annual rain precipitation fluctuating between 60.3 and 125.6 mm) during which the available water content (AWC) of the upper 30 cm took place. Measurements were carried out on a low (~ 10 m) flat dune top and an adjacent undulated loessial basin, having slightly inclined surfaces (L_inc) and 5-10 cm low depressions (L_dep) where water tend to concentrate following runoff. The cover of the annual plants, species composition, density and biomass were measured in the end of the growing season (early April) in 30 cm diameter plots demarcated along a pair of 15 m-long transects on the sand (S), and loess (L). Additionally, twenty 30 cm-diameter plots were randomly demarcated to measure the plant variables in L_inc and L_dep.

本数据集的观测区域设于内盖夫沙漠（Negev Desert），2012-2016年间开展了近乎每周一次的野外监测，该时段内年降雨量波动于60.3~125.6 mm之间，期间测定了0~30 cm上层土壤的有效含水量（available water content, AWC）。
监测分别在两处样地开展：一处为海拔约10 m的平坦沙丘顶部，另一处为相邻的起伏黄土地貌盆地；后者包含坡度较缓的坡面（L_inc）与5~10 cm深的洼地（L_dep），径流产生后水分会在此类洼地汇聚。
于生长季末期（4月初）测定一年生植物的相关指标，包括盖度、物种组成、密度与生物量：在沙地（S）与黄土（L）生境中，各沿一条15 m长的样带划定直径30 cm的样方，共计设置2条样带。
此外，在缓坡面（L_inc）与洼地（L_dep）生境中，随机划定20个直径30 cm的样方，用以测定上述植物相关变量。