黄土高原不同立地条件下刺槐生长与水分关系研究

对黄土高原丘陵沟壑区3种立地下的刺槐生长状况与土壤水分条件的关系进行了研究.对生长中期和生长末期3种立地刺槐的蒸腾速率及与其有关的环境因子进行了测定.结果表明:在生长初期、中期、末期3个时期半阴坡、半阳坡、阳坡3种立地间土壤水分的差异均达极显著水平.半阴坡的蒸腾与半阳坡差异不显著,与阳坡差异极显著,蒸腾速率与光强和土壤水分有明显的相关关系.3种立地条件下刺槐新枝生长的差异达显著水平,胸径生长与土壤水分显著相关,新枝生长与土壤水分相关关系达极显著水平,这说明土壤水分是影响不同立地条件下刺槐生长差异的主要因子

Relationship Between Growth of Locust and Soil Water in the Different Habitats on the Loess Plateau

Relationship between growth of locust and soil water in three different habitats on the Loess Plateau in north of Shaanxi were studied. The three different habitats are semi-shady, semi-sunny and sunny hillside. The data of DBH(diameter at breast height), growth of twig, water content of soil, transpiration rate and environment factors collected from field were studied. The results showed that the difference of twig growth was marked at initial stage, middle stage and last stage of growth, the order from long to short was semi-shady hillside, semi-sunny hillside and sunny hillside. As to soil water content, the difference was also obivious among three habitats. The transpiration was higher under better soil water condition and the growth was also better. This suggested that the soil water conditions of different habitats decided the growth. Relative relationship was found between transpiration and light intensity, soil water condition. Meanwhile, some problems are discussed.