The planting of Yatir Forest, now the largest forest in Israel, started in 1966. It was created at the insistence of Yosef Weitz, a principal visionary of KKL-JNF to use trees to roll back the desert. His single-mindedness gained Weitz the affectionate title "the father of forests". His vision has proved itself: the magnificent Yatir Forest has completely changed the arid landscape of the northern Negev despite opinions of many experts who declared then that the project would totally fail. It transpires that the very existence of Yatir Forest, on the edge of desert regions, is a prime ecological instrument, having already halted desertification on the heights north-east of Beersheba. Now, it is an undisputed fact: the forest has significantly affected the quality of its environment.



Consequently, Yatir Forest has become the focus of recent research by Professor Dan Yakir of the Weizmann Institute of Science. This research is part of worldwide studies on mechanisms that absorb damaging hothouse gases, an international project carried out in parallel in a hundred sites around the globe, with financing from the European Union. Since 2000, Yatir Forest has actually been serving as a living laboratory: it has a sophisticated monitoring station that checks natural data - precipitation, moisture, growth, the trees' natural development mechanisms, their emission of gases, the air's composition, and other factors. The forest's "unnatural" desert location makes this research even more important.



One of the main parameters examined in this research is the amount of carbon dioxide the forest absorbs from the air, taking into account the fact that average annual rainfall has gradually decreased from 350 mm to only 300 mm whilst the quantity of compounds in the air is increasing. Professor Yakir's survey is the only one in recent years that checks the forest's overall functioning from the viewpoint of both the ecology and its independent functioning.



Partial results of the research by Professor Yakir and his team show that the forest's trees have adapted themselves to arid environmental conditions by naturally smart use of the high level of carbon dioxide in the air. Professor Yakir explains that because of the rise in the level of carbon dioxide in the air, the trees absorb all the carbon dioxide they require without needing to fully open all the stomas (apertures) in their leaves' membranes. Partial opening of the stomas reduces the evaporation of the water on the leaves and so a tree uses less water without any damage to its development.



Professor Yakir says that this is the solution to the mystery of the "disappearance" from the atmosphere of some seven billion tons of carbon dioxide from industrial emissions worldwide. In the course of the complex measurements carried out in Yakir Forest it was discovered that, contrary to the accepted assumptions, the desert forest of Yatir absorbs carbon dioxide just as efficiently as forests in wet areas- and in fact it does it better. Yakir's premise is that the rising percentage of carbon dioxide in the atmosphere helps forests expand to semi-arid and desert areas, because when the air has a relatively high level of carbon dioxide, a plant is able to evaporate less water while still absorbing the carbon dioxide that it needs for the photosynthesis process.



The Yatir Forest has its own "biological clock" dictated by its environmental conditions. While similar pine forests in Turkey are in a state of full metabolic activity in the summer months, during that same hot, dry period the Yatir Forest is in suspended animation, with its trees at a very low level of physical activity. Only in winter-time does the forest return to full metabolic functioning, and that is when most of its growth, and most of its absorption of carbon gases, takes place.



This research and others at the Desert Research Institute of Ben-Gurion University spearhead the Green focus that has become the target of KKL-JNF activity in recent years, arousing much interest and curiosity among international bodies, including the US Forest Service which is closely monitoring their progress, plus various government ministries in countries where KKL-JNF representatives have direct work and research relationships.



Another parallel research study within Yatir Forest is the investigation of annual and multi-annual growth, where controlled grazing by flocks from local Bedouin villages is permitted within the forest; an arrangement has been in existence in the last few years to the mutual satisfaction of both KKL-JNF foresters and Bedouin owners of flocks.
The desert boundary is itself a subject of research aimed at conserving land and water. KKL-JNF is partner in several researches on trapping flood waters and surface runoff water by constructing low embankments in planted areas, to catch whatever little water there is, to prevent soil erosion and the silting up of river channels. Such research has a strong impact on decision making about the development of new farming areas, especially in the Negev.

KKL-JNF's research together with infrastructure on different methods to combat global climate changes, have already gained scientific recognition worldwide. "Yatir Forest would never have been planted where it is, if a scientist had been the one to make the decision to do so," Professor Dan Yakir often says about the green expanse that is the topic of his important research. The results of that research, though still only partial, already show that Yosef Weitz's vision is reaching fruition, even bringing unanticipated strength in the war on global warning. In scientific terms, Israel's contribution to this international battle cannot be overrated: KKL-JNF's work both enhances Israel and helps the international community.

For more information, please visit our website at www.kkl.org.il/eng or e-mail ahuvab@kkl.org.il



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