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- W2381170423 abstract "Using portable photosynthesis system (Li-6200) and portable steady porometer (L i-1600), This paper study mainly the quantitative relation between plant physio logical parameter and soil moisture, namely the response process of the tree net photosynthesis rate(Pn),transpiration rate(Tr),carboxylation efficien cy(CE),water use efficiency of leaf(WUE L), stomatic conductivity(Cs ) and stomatic resistance(Rs)to soil water content(SWC)using three ki nds of trees of Black Locust, Oriental Arborvitae and Apple tree in semi-arid r egion on Loess Plateau (Fangshan county, Shanxi Province). The results show that the optimum SWCkeeping the highest Pnof Black Locust, Oriental Arborv itae, Apple tree is 17.13%, 15.90%, 16.11%; the critical SWCvalue of mainta ining the highest Pnupwards 70% (namely the SWCof turning point of C s~SWCcurve) is 10.50%, (9.50)%, 9.75% respectively; the best SWCto sup port the highest WUE Lis 13.23%, 10.66%, 12.38% in turn; the SWCis 15 .70%, (15.50)% and 15.83% with the highest CE; the SWCof the highest Tris 18.82%, (19.70)% and 16.33% respectively. According to the essential a im to saving water and increase effectively water use efficiency of forest by water-h arvesting afforestation, the critical value of the SWCkeeping the optimum WUE Lcan be chosen as a upper limit value for control woodland soil moistu re and stand density as wall as calculating the trees water requirement, the SWCcritica l value of maintaining the highest Pn70% upwards is chosen as the lower l imit value to control woodland soil moisture on Loess Plateau in semi-arid regi on, This range of the optimum SWCcan be generalized as Black Locust 10.5%~ 13.5%, Oriental Arborvitae 9.5%~11.0%, Apple tree (10.0)%~12.5% (equal to 50 %~64%, 45%~52%, 48%~60% of field capacity) respectively." @default.
- W2381170423 created "2016-06-24" @default.
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- W2381170423 date "2001-01-01" @default.
- W2381170423 modified "2023-09-24" @default.
- W2381170423 title "Fitting Soil Moisture Environment of Trees Growth on Loess Pla teau in Semi-arid Region" @default.
- W2381170423 hasPublicationYear "2001" @default.
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