【摘要】 采用人工控制土壤水分的方法 ,野外定期现场实测了山西省方山县峪口镇径流林业试验基地内油松与侧柏人工林的土壤水分、光合速率、气孔阻力及其环境因子 ,研究了油松与侧柏光合速率与土壤含水量的关系 ,证明两树种的光合速率与土壤含水量的关系均可用回归方程 Pn=b+b1 C+b2 C2来表示。研究表明 ,在该地区油松与侧柏的适宜土壤含水量范围分别为 10～ 18 ,8～ 18 ,最佳适宜土壤含水量分别为 14 .2 ,13.1 ,相对应最大光合速率分别为 5 .7,8.3μmol/ m2 .s,说明在同样的水分条件下侧柏的水分利用效率要比油松高 ,侧柏更适合该地区立地条件。这为在黄土高原地区布设相应的径流林业措施、进行有效的土壤水分管理提供了理论依据。更多还原

【Abstract】 The relationship between soil moisture and photosynthesis rate to Chinese pine and Chinese arborvitae under the condition of controlled soil water in field of the Loess Plateau were analyzed. Soil moisture, photosynthesis rate and stomatal resistance of leave, and environmental factors were termly observed at intervals of two hour for all the day every month from May to September in man made forest at Fangshan county of Shanxi province. The result showed that there is a close correlation between photosynthesis rate and soil moisture for the trees, which is presented with the equation of P n=b+b 1C+b 2C 2. Based on the environmental factors and suitable photosynthesis rate it concluded that soil moisture of supporting normal growth for Chinese pine and Chinese arborvitae is respectively 10%～18% and 8%～18%, and optimum soil moisture is respectively 14.2% and 13.1% , corresponding maximal average photosynthesis rate is respectively 5.7μmol/m 2·s and 8.3μmol/m 2·s.It concluded that Chinese arborvitae is more adaptive to the Loess Plateau than Chinese pine. This conclusion supplies foundation for water utilization of stands on the Loess Plateau.更多还原