CAJ | 학술논문

通过对广东省湛江市雷州半岛桉树(Eucalyptus urophylla S.T.Blake)人工林的树液流通量、环境因子、土壤蒸发、林冠截留和林分特性相关指标一年多的连续观测,以及通过一个理论公式对日蒸散量的计算,得出了如下结论:(1)土壤特性及由此决定的土壤水势对树液流通量,以及树液流通量密度(SFD)与气温的关系有一定影响;(2)林冠层的VPD(空气饱和差)对SFD有显著影响;(3)由测定和计算得来的蒸散量在河头和纪家分别有5.26%和6.14%的偏差,可以认为这两种方法有较好的一致性;(4)河头和纪家的林分蒸腾量占总蒸散量百分比分别为62.2%和51.3%;(5)树种单位叶面积水平上的SFD是评价该树种水分利用的重要指标.
통과대광동성담강시뇌주반도안수(Eucalyptus urophylla S.T.Blake)인공림적수액류통량、배경인자、토양증발、림관절류화림분특성상관지표일년다적련속관측,이급통과일개이론공식대일증산량적계산,득출료여하결론:(1)토양특성급유차결정적토양수세대수액류통량,이급수액류통량밀도(SFD)여기온적관계유일정영향;(2)림관층적VPD(공기포화차)대SFD유현저영향;(3)유측정화계산득래적증산량재하두화기가분별유5.26%화6.14%적편차,가이인위저량충방법유교호적일치성;(4)하두화기가적림분증등량점총증산량백분비분별위62.2%화51.3%;(5)수충단위협면적수평상적SFD시평개해수충수분이용적중요지표.
During the period of September 12, 1999 to September 24, 2000, we measured sap flow of eucalyptus (Eucalyptus urophylla S.T. Blake) plantations using heat pulse technique, and the relevant environmental vaiables, such as soil evaporation and canopy interception, etc, at Hetou and Jijia sites,Leizhou Peninsula, Guangdong Province. Based on the measurements of sap flow and estimates of evapotranspiration, the following can be concluded: (1) the maximum of diurnal xylem sap flux density (SFD) at Hetou, where covered with coarse-textured soils formed on Quaternary sediments, was almost twice of that at Jijia, where located on clay-rich soils derived from basalt; (2) SFD was highly correlated to water vapor pressure deficit (VPD) of ambient air near the canopy layer; (3) the correlation between SFD and air temperature also depends on soil properties and soil water potential; (4) the relative differences between measured and modeled evapotranspiration were small, being 5.26% at Hetou and 6.14% at Jijia; (5) the plantation transpiration accounted for 62.2% and 51.3% of the evapotranspiration at Hetou and Jijia,respectively; and (6) the averaged SFD per unit leaf area (ASPULA) was a good index to estimate the amount of water consumption of tree species.