Woody and herbaceous competition effects on the growth of naturally regenerated loblolly and shortleaf
نویسنده
چکیده
Four levels of vegetative competition wete used to quantify the growth of loblolly and shot-deaf pines (Pinus taeda L. and /? echinatu Mill.) in naturally regenerated, even-aged stands on the Upper Coastal Plain of southeastern Arkansas, USA. Treatments included: (I) no competition control, (2) woody competition control, (3) herbaceous competition control. and (4) total control of nonpine vegetation. After pines became established from natural seeding, herbicides were used to control herbaceous plants for 4 consecutive years and woody plants for 5 consecutive years. Even though 89% of crop pines on untreated check plots were free-to-grow 11 years after establishment, crop pines on vegetation control plots were larger (P<O.OOl) in mean dbh. total height, and volume per tree. From age 5 through I1 years, crop pine diameter growth increased on woody control plots and decreased on herbaceous control plots because of hardwood competition in the latter treatment. At age 11, cmp pine volume production averaged 207 m-‘/ha on total control plots. 158 m3/ha on herbaceous control plots. 130 m31ha on woody control plots. and 102 m’/ha on untmated check plots.
منابع مشابه
The Influence of Woody and Herbaceous Competition on Early Growth of Naturally Regenerated Loblolly and Shortleaf Pines’
Four levels of competition control were used to study the response of naturally regenerated loblolly and shortleaf pines (Pinus taeda L. and P. echinata Mill.) in southern Arkansas. Trea1ment.s included: (1) Check (no competition con’ Cooperation was provided by the folowing organizations: Department of Forest Resources University of Arkansas at Monticello, and Georgia-Pacific Corp. The use of ...
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