沙地柏对除叶干扰的生理和生长响应

为了研究沙地柏对模拟自然干扰的生理和生长响应，在毛乌素沙地对它进行了人为除叶为处理的模拟山羊啃食，虫害实验，结果表明，除叶干扰通过改变生理指标峰值出现的时间影响日动态，并显著影响生理指标的日平均值，除叶干扰对当年生枝生物量分配的影响不明显，但显著影响其生长特征。除叶干扰的最终效应受干扰方式和强度的双重制约，不同生理，生长指标对除叶干扰的敏感性存在差异，如净光合速率和腾速率，除干扰具有补偿效应，尤其是除老叶，因此适度剪除2年生以下枝条上的叶可促进当年生枝的生长和生物量积累。

Physiological and growth responses of Sabina vulgaris to disturbance of leaf removal.

To examine the physiological and growth responses to Sabina vulgaris to natural disturbance, a field experiment to simulate the grazing and pest disturbance was conducted in Maowusu sandy land through artificially removing leaves. The disturbance of leaf removal could modify the species' diurnal physiological dynamics through changing the timing of extreme values, and moreover, change the average daily values of physiological indexes significantly. Leaf removal could affect the growth traits, but not biomass allocation significantly. The consequences of the disturbance were confined by its means and intensity, and there existed significant differences in sensitivity of different physiological and growth characteristics e.g., net photosynthesis rate and transpiration rate to leaf removal. The disturbance of leaf removal, especially that of old leaf removal, had compensation effects. Therefore, moderately removing the leaves on the shoots with less than 2 years old could enhance the growth and the biomass accumulation of current-year shoots.