Accession Number : ADA309845

Title :   HYDRIL (Version 1.0). A Simulation Model for Growth of Hydrilla.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB

Personal Author(s) : Boyd, William A. ; Best, Elly P.

PDF Url : ADA309845

Report Date : MAY 1996

Pagination or Media Count : 37

Abstract : A simulation model for the dynamics of a submersed Hydrilla vegetation (delicious biotype) has been developed, called HYDRIL. The model is based on the carbon flow through the vegetation. It includes several aspects that affect biomass dynamics, such as latitude, seasonal changes in climate, pH effects on carbon availability, wintering strategies, grazing (removal of above- ground and tuber biomass), and mechanical control (removal of aboveground biomass). The characteristics of the vegetation and of site can be easily modified by the user. HYDRIL can be used to gain insight into the processes affecting the dynamics of a Hydrilla vegetation in relatively shallow, hard water (0. 1- to 2.5-m depth; DIC concentration > 0.8 mmol). It has been calibrated on data pertaining to a Hydrilla vegetation in Lake Orange, Florida. At that site, no aboveground wintering biomass is present, and growth starts from the tuber bank. Peak biomass is reached late in August, and tuber formation takes place in autumn, replenishing the tuber bank.

Descriptors :   *VEGETATION, *AQUATIC PLANTS, SIMULATION, PEAK VALUES, MECHANICAL PROPERTIES, DYNAMICS, CARBON, AVAILABILITY, SEASONAL VARIATIONS, PLANT GROWTH, CLIMATE, CALIBRATION, LAKES, ORANGE(COLOR), PH FACTOR, FLORIDA, LATITUDE, BIOMASS CONVERSION, AUTUMN, HARD WATER.

Subject Categories : Biology
      Biological Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE