Drought-resistant physiological characteristic of four dominated grass vegetation species during the seedling stage in dry-hot valley of the Jinsha River

In order to clarify drought-resistant physiological characteristic of dominated grass vegetation in Jinsha River dry-hot valley. Soil water and drought-resistant physiological characteristic of Heteropogon contortus, Bothriochloa pertusa, Eulaliopsis binata, Paspalum natatu during seedling stage were studied in a potted experiment simulated natural drought condition. The results indicated that soil water content decreased significantly with the passing of time after irrigation. The soil water content was higher in potted B. pertusa than in others. Leaf water content of H. contortus and B. pertusa didn't reduce significantly with reduction of soil moisture(P>0.05). Leaf water content of E. binata and P. natatu reduced obviously at 30 d after irrigation(P<0.05). Proline accumulation of H. contortus, B. pertusa and P. natatu increased significantly at 15 d after irrigation(P<0.05). Proline accumulation of E. binata didn't increase significantly with reduction of soil moisture. Chlorophyll content of H. contortus and P. natatu didn't reduce significantly, Chlorophyll content of B. pertusa and E. binata reduced significantly with reduction of soil moisture. MDA content of B. pertusa and P. natatu didn't increase significantly, MDA content of H. contortus and E. binata increased significantly with reduction of soil moisture.