Yearly and seasonal changes in aboveground biomass and soil water of cultivated Old World bluestem (Bothriochloa ischaemum) grasslands in different habitats were compared.

• 对半干旱黄土丘陵区不同立地条件下白羊草Bothriochloaischaemum人工草地的生产力与土壤水分状况进行比较研究。