Is light the key factor for success of tube shelters in forest restoration plantings under Mediterranean climates?

Puertolas, J., Oliet, J.A., Jacobs, D.F., Benito, L.F., Penuelas, J.L. 2010. Is light the key factor for success of tube shelters in forest restoration plantings under Mediterranean climates?. FOREST ECOLOGY AND MANAGEMENT, 260:610-617.