65 % 80 % 35 % 50 % 60 % 78 %., CHIN ESE JOURNAL OF APPL IED ECOLO GY,Feb. 2004,15 (2) ,,

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1 CHIN ESE JOURNAL OF APPL IED ECOLO GY,Feb. 2004,15 (2) (2,712100).,5.,.,,. 12 :00.,,,.. > > > >.,., (2004) Q14218 A Relationships between water and productivity of seabuckthorn ( Hippophae) in different habitats of the Loess Plateau, China. WEI Yukun, L IAN G Zongsuo, CU I Langjun, HAN Ruilian ( Institute of Soil and W ater Conservation, Chinese Academy of Sciences and Minist ry of W ater Resources, Yangling , China). 2 Chin. J. A ppl. Ecol.,2004,15 (2) : This paper deals with the relationships between water and productivity of seabuckthorn in different habitats of the Loess Plateau in north Shaanxi. The typical habitats were classified with hilltop, sunny, shady, semi2shady and semi2sunny hillside. The results showed that values of transpiration of five kinds of habitats were different, and transpiration of semi2shady was relatively stronger in the morning while others were weaker. With the varia2 tion of directions of sunshine, transpiration of shady and sunny was declining and meanwhile transpiration of hill2 top was steady. transpiration of semi2shady reached the peak in 12 :00. In the afternoon, these values of transpi2 ration all reduced in different extents except seabuckthorn of shady, especially semi2shady. The mean transpira2 tion of 5 habitats was ordered in semi2shade > shade > semi2sunny > hilltop > sunny. There were remarkable difference between diffuse resistance and transpiration, and same relationship was found between relative humidi2 ty and transpiration. But this relationship was not found between light intensity and transpiration. Different habitats had different productivities, and productivity of seabuckthorn in shade habitat was higher than those in other habitats. Key words Seabuckthorn, Water relations, Productivity, Different habitats, Loess Plateau. 1 ( Hi ppophae) ( Elaeagnaceae),.,, [5 ]..,,,,,,, [4 ]. :,.,,., 65 % 80 % 35 % 50 % 60 % 78 %.,, [6 ].,,, 3 ( KZCX1206) ( ) ,

2 ,, ,,,,, ,, m.,,.,,,. 7. 8,, 37. 1, mm, %. 7 % :. 5 1, 5, hm - 2,3 m 1 m. 1,30 cm 0. 3 cm.,,20 cm,,,. 1998,. (5 9 ) 2, ,,2001 9, : (Li) ( RH, %), Li21600 ;, 20 cm 1,, 200 cm. 5 3,. 7 : :00, Li21600 ; [2 ]; (cm) ;, , 2 3 m,, ( 0 40 cm) [7 ]. 2001, mm, Table 1 Rainfall distribution in growth season of seabuckthorn from 1999 to 2001 Time 4 Apr. 5 May 6 J une 7 J uly 8 Aug. 9 Sep. 10 Oct %.,.,,,.,,,,,,7 8,. 2 Table 2 Analysis on water content of soil under different habitats Time Variation F F F Square Free Handdled Repeat Total variation Handdled Repeat Total variation Handdled Repeat Total variation Handdled Repeat Total variation Handdled Repeat Total variation Handdled Repeat Total variation ,, (), 8, 7. 1, ,,, 100 cm,. 120 cm,

3 2 : % cm, % % cm, 30 cm,.. 60 cm 1 Fig. 1 Water content of soil on different habitats. 3 Table 3 Relative humidity of air and light intensity mean values Date (m. d) Semi2shady Semi2sunny a) 7 14,b) ;120 cm. 1b,,, 50 cm ,,,,,.,,(50 cm ),(100 cm ) ,, % % ;, % %, (, RH ). ( mol s - 1 m - 2 ),,. Hilltop Sunny Shady ab bc c c a H( %) ab bc c c a ab ab a a b L ( mol m - 2 s - 2 ) ab ab a a b 312 2,5.,,,.,,,.,. 12 :00,,,,,,.,,,.,,,. 14 :00., (,, ). 18 :00,. 3, > > > >. 4. 4, 12 :00, 8 : 00, 2 Fig. 2 Daily variation of transpiration of seabuckthorn under differnt habitats.

4 Fig. 3 Meanvalue of transpiration of seabuckthorn under different habi2 tats. 4 Fig. 4 Transpiration rate of seabuckthon under different habitats and times.,16 :00., ,,, ( 5).,5 6 7,8 9. 3, g cm - 2 s Fig. 5 Monthly variation of transpiration rate of seabuckthon under dif2 ferent habitats. 4. 4,8 :00 10 :00,8 :00,,,. 10 :00,. 12 :00 14 :00,,,,. 12 :00,( P < 0. 01). 14 : 00,,. 16 :00 18 :00,16 : 00, 18 : Table 4 Difference of seabuckthorn transpiration under different habi2 tats Time Semi2shady Shady Sunny Hilltop Semi2sunny 8 :00 Mean P = a ab b b b P = A AB AB AB B 10 :00 Mean P = a ab c bc abc P = A A A A A 12 :00 Mean P = a c c c b P = A B B B A 14 :00 Mean P = a b c c c P = A A B B B 16 :00 Mean P = a b b b b P = A AB B B AB 18 :00 Mean P = a ab ab b ab P = A A A A A 313 6a 8 20.,, % % % % %,.,. 6b 9 10, 6a,,

5 2 : Fig. 6 Relative water content of seabuckthon under different habitats. a) 8 20,b) a,,.,. 7b, ;,., 160 cm,,74 cm, 86 cm.,.,,. 7c.,. 7c,,,,,.. 7d.,3, g, g, g.,,. 4 7 (a) ( b) (c) (d) Fig. 7 Height (a),height increase prencentage (b),stem(c),and biomass (d) of seabuckthon under different habitats ( 7), [6 ],,,.,., ( r = ),,,,.

6 ,, ;,,,.,, ( r = ) ( r = ) ( r = ) ( r = ) ( r = ). [8 ],...,,.,,.,,.,,,.,,. [1 ],,,.,,. 1 Dong X2J ( ), et al A preliminary study on the water regimes of Sabina v ulgaris in Maowusu Sandland, China. Acta Phytoecol Sin ( ),23 (4) : (in Chinese) 2 Gao J2F ( ) Plant Physiology Experiment Technolo2 gy. Xi an : World Books Publication Company Han R2L ( ),Liang Z2S( ), et al Water con2 sumption properties of adaptable nursery stocks on Loess Plateau. Chin J A ppl Ecol ( ),5 (2) : (in Chinese) 4 He W2M ( ) Effects of water factor on hydraulic and growth characteristics of Sabina v ulgaris seedlings. Acta Phy2 toecol Sin ( ),25 (1) :11 16 (in Chinese) 5 Liang Z2S( ),Wang J2F ( ) Biology and Uti2 lization of Seabuckthorn. Xi an : Shanxi Science and Technology Press. (in Chinese) 6 Wang M2B( ), Li H2J ( ),Chai B2F( ) Water ecophysiological characteristics of Caragana korshinskii. Acta Phytoecol Sin ( ), 20 ( 6) : (in Chi2 nese) 7 Wright IJ, Westoby M Differences in seedling growth be2 havior among species trait correlations across species, and trait shifts along nutrient compared to rainfall gradients. J Ecol,87 : Yan C2R ( ), Han X2G( ), Cheng L2Z ( ) The relationship between the ecophysiological feature and leaf characteristics of some woody plants in Beijing Mountain Zone. Ac2 ta Ecol Sin ( ),20 (1) :53 60 (in Chinese),,1976,,. E2mail net