, ; 21Forest Science Centre, Heidelberg, Victoria, Australia 3084 ; 31

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1 2003,16(6) : Forest Research : (2003) , 1, Jim Morris 2, 1, 3 1, (11, ; 21Forest Science Centre, Heidelberg, Victoria, Australia 3084 ; 31, ) : 4 : (1), 12 1 ; ; 1116 L m - 2 d - 1, 1513 L m - 2 d - 1 ( ), 514 L m - 2 d - 1 ( ) ; (2),, ; (3) 2, 314 % ; (4) : ; ; :S :A ( Eucalyptus urophylla S1 T1 Blake), [1,2 ],,,, [3 5 ],, [6 ] [7 ], [8 11 ] Huber,Edwards Warwick [8 ] [11, Olbrich ] [12,13 ] : : ACIAR FST 1997Π ( ) : (1974 ),,,. 3 John Collopy,.

2 662 16, 90 [14 16 ] [17 ; ] ( Juglans mandshurica Maxim), a ( ), 1 (110 0 E 21 0 N),,,,, 2315,7 2819, ; mm,,,5 9, 85 % 80 %,,6 10, 2 3, 8 10, 11, 12, 1996, m 2 (40 m 40 m), hm hm - 2, cm ( ) ; 40 km, 2 211, 715 m, ( Thete probes, Delta T Devices, UK) ( cm) 30 min, Tain (Box Hill,Australia), 30 min ( V PD) [6 ] : V PD = (273 + T) ln ( RH) ( 01628, T, RH ) (1) [18 ( u) ] : u = ( X up + X dn ) Π2 t (2) u, X up X dn ; t [19 ] : u = p + qu + r( u) 2 (3) u ; p, q, r, ( mm, 0105 mm ) ( 3 cm h - 1 ) [18 ] : V = b ( m c ) u (4)

3 6 : 663 V, b, m c,0133 : = VA (5) A, : V = ax 2 + bx + c, x [8, a, b, c ] : Q = R - r 0 2 ( r - x) ( ax 2 + bx + c) dx (6) Q, R, r, x [14,20 ] (Heatpulser, Edwards Industries, ) 30 min, (Campbell, CR10X, ), 30 min ;3 4,,,, HeatPluser system [21 ] ( S FD) ( MS2 FD) [22 ] , 2 6 m 20 cm,, ; ( 1 h),,, 20 min 3 311, [23 ] 1,

4 664 16, ;, ( 2), 8 :00,,12 :00 13 :00, 15 :00,, ;,, ( 5 7 mm ), ( mm ) 2,,, 1116 L m - 2 d - 1, 1513 L m - 2 d - 1 ( ), 514 L m - 2 d - 1 ( ), cm,ht13 HT14 HT19 ( HT Hetou Tree,HT13 ),, HT17 HT18, 3 ( HT13 HT cm ; HT17 HT cm),, ( HT18 HT cm), 313, m 4, ; 5125 L, 5107 L, 0117 L, 314 % ;,

5 6 : s, 800 s 4 314,, 5 V PD,, 50 cm 4 5 ( S FD),,

6 L m - 2 d - 1, 1513 L m - 2 d - 1 ( ), 514 L m - 2 d - 1 ( ) ;,, Granier [24 ] ( Quercus petraea (Matt1) Liebl1 and Q1 robur L1) [25 ; ], ;,,,,,,,,, [26 ] 314 %,, ( ) (800 s), 800 s,,, ;, : [1 ],. [J ].,1996,9(2) :63 68 [2 ]. ( ) [M]. :, [3 ] Poore M E D, Fries C. The ecological effects of Eucalyptus[A]. FAO Forestry Paper No. 59. FAO, Rome, [ 4 ] Dye P J. Climate, forest and streamflow relationships in South Africa afforested catchments[j ]. Commonwealth Forestry Review, 1996, 75 :31 38 [5 ] Calder I R. Water use of Eucalyptus a review[a]. in :Calder I R, Hall R I. Growth and water use of forest plantation[ C]. England, Chichester :John Wiley and Sons, [6 ] Kramer P J. Water relations of plants[m]. San Diego : Academic press, 1983 [ 7 ] Swanson R H. Significant historical developments in thermal methods for measuring sap flow in trees[j ]. Agric For Meteorol, 1994,72 : [8 ] Edwards W R N, Warwick N W M. Transpiration from a kiwifruit vine as estimated by the heat pulse technique and the Penman2 Monteith equation [J ]. New Zealand J Agric 1984,27 :

7 6 : 667 [9 ] Dye P J, Olbrich B W. Heat pulse observations of Eucalyptus grandis transpiration in South Africa [ A]. in :Calder I R, Hall R I. Growth and water use of forest plantation[ C]. England, Chichester :John Wiley and Sons, [10 ] Hatton T J, Vertessy R A. Transpiration of plantation Pinus radiata estimated by the heat pulse method and the Bowen ratio [J ]. Hydrological Processes,1990,4 : [11 ] Olbrich B W. The verification of the heat pulse velocity technique for estimating sap flow in Eucalyptus grandis[j ]. Can J For, 1991, 21 : [12 ], Edwards W R N. [J ].,1993, 6 (4) : [13 ],,,. (HPVR) [J ].,1993, 29(2) : [14 ],. [J ].,1998,20(1) :1 6 [15 ],,,. [J ].,2000,22(5) :1 6 [16 ],. [J ].,2001,21(4) : [17 ],Alec Downey,,. [J ].,1999,19 (6) : [18 ] Marshall D C. Measurement of sap flow in conifers by heat transport [J ]. Plant physiology, 1958, 33 : [ 19 ] Swanson R H, Whitfield D W A. A numerical analysis of heat pulse velocity theory and practice [J ]. Journal of experimental botany, 1981,32 : [20 ],. (Heat pulse) [J ].,2000,11(2) :22 27 [21 ] Morris J D. HP : a heat pulse data management system for the Custom and Greenspan loggers[ R]. Melbourne. Centre for Forest Tree Technology, 1995 [22 ] Ladefoged K A. Method for measuring the water consumption of large intact tree[j ]. Physiologia plantarum, 1960,13 : [23 ] Zimmermann M H. Xylem and the ascent of sap[m]. Berlin,Heidelerg,New York :Springer2verlag, 1983 [24 ] Granier A, Anfodillo T, Sabatti M, et al. Axial and radial water flow in the trunks of oak tree : a quantitative and qualitative analysis [J ]. Tree physiology,1995,14 : [25 ]. [D]. :,2002 [26 ] Mahmood K, Morris J, Collopy J, et al. Groundwater uptake and sustainability of farm plantations on saline sites in Punjab province, Pakistan [J ], Agricultural water management, 2001,48 :1 20 Characteristics of Sap Flow in Eucalyptus urophylla Plantations on the Leizhou Peninsula ZHANG Ning2nan 1, XU Da2ping 1, JIM Morris 2, ZHOU Guang2yi 1, ZHOU Guo2yi 3, WU Zhong2min 1 (11Research Institute of Tropical Forestry, CAF, Guangzhou , Guangdong, China ; 21Forest Science Centre, Heidelberg 3084,Victoria, Australia ; 31South China Institute of Botany, CAS, Guangzhou , Guangdong, China) Abstract : Heat pulse method was applied to study sap flux density ( S FD) of single tree in 42year2old Eucalyp2 tus urophylla plantation from September 1999 to September 2000 on Leizhou Peninsula, southern China. The re2 sults indicated that S FD of outer sapwood moved faster than the inner ; the daily S FD of trees with different di2 ameter followed similar pattern, the bigger trees had faster S FD than smaller trees due to size of root system. To prove the accuracy of heat pulse method, water use of a 22year2old young tree with height of 6 m was measured by the heat pulse method and a cut2stem method at the same time. It was showed that the estimated water use differed by 3. 4 % only. Among meteorological factors, solar radiation and VPD were the main factors affecting the sap flow. The heat pulse method was proved to be a accurate way to measure water transpiration by eucalypt tree plantations and recommended for wider application in water balance studies of plantations. Key Words :heat pulse method ; Eucalyptus urophylla ;sap flow density