The study related to creating Forest Soil Quality Index Map in broadleve and conifer forest (Fir, Spruce, Beech and juniper stands) depending on ecological factors (slope, aspect, elevation,main rock type, crown closure, stand type).
Firstly, which soil quality indicators as physical, biogical and chemical must be choosen?
Secondly, how can be assessed the quality of indicator, is there any special score card suitable for the forest ecosystem? or has any method been developed for assessing output values?
Finally, Please share with me any idea and any comments about indicator selection, method, analysis and creating map in emergency. I am looking forward this...
The forest's features in which can be studied at the below.
Elevation: 1400-2100 mt.
Aspect: North and South groups
Slope: %12-60
Soil depth: Moderate>>> % 90 (up to 100 cm), shallow>>> %10 (up to 30 cm)
Location: Temperate Zone (39E-40N)
Mean Temperature: 11 °C
Annual Precipitation: 1100-1250 mm
Main Forest Species: Beech, Spruce, Fir, Juniper
Forest Stand Type: Beech+Spruce (1400-1750mt), Spruce+Beech+Fir (1750-2000 mt), Spruce+Juniper (2000-2100 mt.)
Main Rock Type: Granite (% 35) and Andesite+Basalt (%65)
Dr. Kezik, you have the forest in the site? If this cuestion is ok, you will can work with the site index. If you will need you will can read the paper " Soil properties and their relation to the SI of Pinus taeda L. plantations in the Argentine Mesopotamia". You will can write me or read in the Researchgate".
The main soil properties that affect tree growth are available soil water capacity and soil fertility. The first is mostly a factor of soil depth and texture, and the second is a factor of the minerals available in the soil. Soil pH can be an indicator of the availability of minerals and the trees' ability to absorb them. Optimal pH for most trees is around 7, but many, especially conifers can tolerate much lower. If the pH gets much above 8, trees struggle. A very good indicator of tree growth or success is leaf area index. This is a measure of the area of leaf cover versus the area of visible ground beneath them. There is an annual maximum for each tree species. As the previous question suggests, a site index is often used to characterize the productivity of a given location for trees. What I don't see in your list of variables is climate, which is another factor often included in site index.
Dr. Ugur Kezik. Can you tell me if you have the forest in the site? If you do not have the forest on the site, you should determine the index with varying soil in established plantings. Then, you must apply this rate on the sites you want to predict the future growth their plantations.
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