土壤含水量和光照对沙地柏光合生理指标的影响

试验采用人工控制土壤水分的方法,测定不同土壤含水量条件及有效辐射强度下沙地柏苗木的蒸腾速率、净光合速率、水分利用效率等指标,分析沙地柏在不同土壤含水量和光照条件下影响的光合生理响应特征及其变化规律.土壤含水量(SWC)用称重法测定,将硬塑盆中的土壤水分含量设置为7.5％,10％,12.5％,15％,17.5％,20％ ...

Effects of soil water content and light on photosynthetic characteristics of Sabina vulgari Ant.

The transpiration rate,net photosynthetic rate and water use efficiency of Sabina vulgari seedlings under different soil water content and effective radiation intensity were determined.Soil moisture content(SWC)was measured by weighing method,and the soil water content in the hard plastic basin was set to 6 different treatments,including 7.5%,10%,12.5%,15%,17.5%,20%,etc,and the instantaneous soil moisture content was weighed every day by TDR100 soil moisture velocimeter.Determination of photosynthetic physiological indexes of S.vulgari under different soil water conditions was done using Li-6400 photosynthetic apparatus(LI-COR).The results showed that the transpiration rate and net photosynthetic rate of S.vulgari increased with the increase of soil water content.Photosynthetically available radiation was in the range of 400-2000μmol·m^-2·s^-1.The net photosynthetic rate,transpiration rate and water utilization rate showed the highest values.Net photosynthetic rate,transpiration rate and water content were at 18.71%,1.79%and 12.44%utilization to the highest value.The soil moisture content of 12.44%to 18.71%was suitable range of soil moisture in sandy cypress.In practice,the planting and growth of S.vulgari can be effectively guided by the optimum soil moisture range.