陕北黄土丘陵区油松人工群落蒸腾强度的初步研究

本文研究了组成人工油松（Pinus tabulaeformis）群落主要植物的蒸腾强度及其日变化和季节变化，并计算了群落的蒸腾强度，结果表明:①组成群落各植物在生长期间的平均蒸腾强度为0.259 3～0.991 6g/g·h，其中乔木层为0.259 3g/g·h，灌木层为0.498 2～0.9916g/g·b，草本层为0.577 2～0.848 8g/g·h；②各植物蒸腾强度的日变化符合多项式E=e^a.e^bt·T^c·r^J，③蒸腾强度有相似的季节变化趋势，但各植物的节律稍有差异；④人工油松群落蒸腾强度为0.284 5g/g·h，其中乔木层为0.262 4g/g·h，灌木层为0.619 7g/g·h，草本层为0.780 8g/g·h。

A PRELIMINARY STUDY ON TRANSPIRATION INTENSITY OF CHINESE PINE COMMUNITY IN LOESS HILLY REGION

According to the transpiration intensity of main species in the community and its variations in a day and season the transpiration intensity of the community was calculated in the paper. The results of the study indicated that(1) the average transpiration intensity of species in P. tabulaeformis community in growth period amounted to 0.259～0.992g/g·h, among which it is 0.259g/g·h for tree layer, 0.498～0.992g/g·h for shrub layer and 0.577～0.849g/g·h for herb layer;(2)the daily variation of transpiration intensity of all species accorded with the mathematical model E=e^a·e^bt·T^c·r^d;(3) transpiration intensity exhibited an analogic tendency to variation in season for all species,but existed a little difference in rhythm of those species;(4) the transpiration intensity of P. tabulaeformis community is 0.285g/g·h, among which it is 0.262g/g·h for tree layer, 0.620g/g·h for shrub layer and 0.781g/g·h for herb layer.