Transpiration Water Consumption & Water-Saving Potential of Farmland Shelterbelt with Different Structures

Through experimental study on transpiration water consumption water-saving potential of farmland shelterbelt with different structures in western region of Heilongjiang province,result shows that: monthly variation of transpiration water consumption of farmland shelterbelt with different structures in this region have significant differences,among them transpiration water consumption of pure forest of larch in August is maximum,and theoretical value is 1 319. 67 mm,and actual value is 723. 75 mm,while transpiration water consumption of pure forest of Pinus sylvestris var. mongolica in June is minimum,only being 29. 4 mm,actual value being 15. 64 mm;transpiration water consumption of farmland shelterbelt with different structures in growing season were sequenced,its actual transpiration water consumption sequencing is: pure forest of larch mixed forest of Pinus sylvestris var. mongolica Populus simonii × P. nigra mixed forest of larch Populus simonii × P. nigra adult Populus alba × Populus berolinensis pure forest of Populus simonii × P. nigra pure forest of Pinus sylvestris var. mongolica young forest of Populus alba × Populus berolinensis;water-saving of farmland shelterbelt with different structures which have significant differences are given,among them water-saving potential of pure forest of larch is the most;it can save water 2 586. 9kg · hm-2 in theory and save water 1 284. 69 kg ·hm-2 actually;the actual water-saving amount of mixed forest of Pinus sylvestris var. mongolica Populus simonii × P. nigra is equal to that of pure forest of larch.