干旱区生态环境知识资源中心

The Haloxylon ammodendron is a very important desert plant in north-west of China and it plays a vital role in ecological protection. We studied growth and physiological character of the plant in different situations of drought stress and established ecological model to predict soil moisture content. The water is well water and the salinity is 1 g/l. We did the irrigation experiment in 4 levels of field water capacity percentage: A scheme - when the field water capacity percentage is lower than 15%, we irrigate the plant; B scheme - when the field water capacity percentage is lower than 30%, we irrigate the plant; C scheme - when the field water capacity percentage is lower than 40%, we irrigate the plant; D scheme - when the field water capacity percentage is lower than 50%, we irrigate the plant. The results show that: (1) under different drought stresses, growth parameters of A and B schemes are less than that of D scheme. A scheme suffered the most severe drought stress, but parts of the growth parameters are superior to that of D scheme. It shows that D scheme is not optimum; (2) the physiological changes are the same as the growth parameters, Haloxylon ammodendron physical activity is affected by the drought stress. The maximum of chlorophyll content appeared in C scheme, followed by D scheme, B scheme and A scheme. The content of proline and malondialdehyde has the same variation with the soil moisture changes. When the field water capacity is lower, the content of proline and malondialdehyde of B scheme is maximum, followed by D scheme, and of C scheme is minimum. The minimum of membrane permeability is B scheme; (3) based on the growth and physiological variation above, we established mathematical model to predict soil water environment for Haloxylon ammodendron. Based on the objective function, we get the moisture value of the different soil suitability. The results provide suggestions for the Haloxylon ammodendron cultivation and ecology construction.