Effects of some soil properties on the growth of hybrid poplar in the Terme-Gölardi region of Turkey
Abstract
In this study, the effects of some physical and chemical soil properties on the growth of hybrid poplar were investigated in the Terme-Gölard› region where a poor growth of trees was observed. Soil samples were taken from both poor and good growth areas. Chemical soil properties such as pH, exchangeable Na+, K+, Ca++ and Mg++ content, CEC, phosphorus content and salinity were determined. Physical soil properties such as field capacity, permanent wilting point, water holding capacity and available water were measured. Ground water depth was measured in the field during soil sampling. Clay and Mg++ content and pH of the soils showed a significantly negative correlation while phosphorus and sand content of the soils had a positive correlation with the growth of hybrid poplar. Mg++, K+, and ground water depth explained 43% of the variation of mean annual height growth. The results indicated that soil conditions had a strong influence on the growth of hybrid poplar in the Terme-Gölard› region. Bu çal›flmada, Terme-Gölard› yöresinde, baz› alanlarda zay›f büyüme görülmesi üzerine, fiziksel ve kimyasal toprak özelliklerinin melez kavaklar›n büyümesi üzerine olan etkileri araflt›r›lm›flt›r. Toprak örnekleri zay›f ve iyi büyüme gösteren alanlar› temsil edecek flekilde al›nm›flt›r. Al›nan toprak örnekleri üzerinde pH, de¤iflebilir Na+, K+, Ca++ and Mg++, katyon de¤iflim kapasitesi, fosfor, tarla kapasitesi, solma noktas›, faydal› su ve tuzluluk özellikleri belirlenmifltir. Ayr›ca arazide taban suyu derinli¤i ölçülmüfltür. Topraklar›n kil ve magnezyum içeri¤i kavaklar›n büyümesi ile negatif iliflki gösterirken, kum ve fosfor içeri¤i pozitif iliflki göstermektedir. Magnezyum, potasyum ve taban suyu derinli¤i ortalama boy art›m›ndaki varyasyonun % 43’ünü aç›klamaktad›r. Bulgular, Terme-Gölard› yöresinde toprak koflullar›n›n melez kavaklar›n büyümesi üzerinde önemli etkiye sahip oldu¤unu göstermektedir.