Shelter ing Effects of Farm land Protective Forest and The ir Rela tion shipsin Artif ic ia lOa sis of Ar id Reg ion
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1.
Research Institute of Forestry, CAF
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2.
Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration,Beijing 100091, China
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Received Date:
2007-06-17
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Abstract
This paper is studied the shelterbelt effects of 11 farmland p rotective forests with different structures inartificial oasis of Ulan Buh Desert, the results showed that (1) with the same structure features ( age, density, rownumber, belt width, inter-belt distance, etc. ) , the porosity of narrow-crown pop lar trees was lower than that ofwide-crown pop lar trees, that of Populus bolleana was 0. 23 lower than that of Populus canadensis, that of Populusnigra L. var thevestina (Dode) Bean was 0. 30 lower than that of Populus n igra L. var thevestina ×P. sim onii, thewindbreak rates (WR) increased by 34. 43% and 26. 46%, compared to those of narrow shelterbelt. The farmlandsheltering rate ( FSR) of wide shelterbelt ( 32 m) increased by 16. 55% —54. 41% , and land competitive index(LCI) and crop yield reduction rate (CYRR) of wide shelterbelt (32 m) decreased by 0. 03—0. 22 and 27. 5% respectively; ( 2 ) compared to those of high trees, the FSR and WR of small2network shrub belt increased by8. 00% —13. 93% and 1. 08% —6. 30% , LCI and CYRR of small-network shrub belt decreased by 0. 01—0. 05and 0. 8% —49. 4% respectively; ( 3 ) compared to those of pure forest, the FSR of mixed forest increased by43. 8% , LC I and CYRR of mixed forest decreased by 0. 27 and 57. 5%; ( 4) 9 years after p lanting, Populusbolleana came to its op timum sheltering age, the op timum sheltering age period is 10—27 age; ( 5 ) shelterbeltdensity, row number and beltwidth had significantly positive relations to shelterbelt porosity (R = 0. 661, 0. 707 and0. 688) ; (6) inter-belt distance had significantly positive relations to tree ( shrub) age.
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