| Based on farmland shelter forest in Hetao Area,the paper discuss the proctive forest regional division,proctive manturity and regeneration age,comprehensive benefit evaluation of protective,saving-water and economic effect etc. the results are as follows:â‘´Collecting kinds of indexs,using method of fuzzy clustering analysis and princomp clustering analysis , the paper divides farmland shelter forest in Hetao Irigated District into 2 Districts:â… is the Farmland protective forest region in the west Hetao irigated area,â…¡is the Farmland protective forest region in the middle-east part Hetao irigated area .⑵Based on the result of investigating growth and sample tree trunk analysis ,comprehensive analsis of protection maturity ,economic maturity and numerical maturity of populus shelterbelt , the results shown that:P. alba var.pyramidalis proctive manturity,numerical maturity,economic maturity,regeneration age is 10a,16a,17a,16a,19a; P. Popularis'proctive manturity,numerical maturity,economic maturity,regeneration age is 8a,13a,14a,15a,15a..⑶Studing on the protect effect of farmland sheleter forest, the result of study shows that on the condition of 100m and 200m's distance space of sheltbelts,the distinguish about two kinds of distance space of sheltbelts on P. alba var.pyramidalis temperature and water effect is not notable difference, but it is notable difference on windbreak effect aspect;the distinguish about two kinds of distance space of sheltbelts on P. Popularis'protect effect is not notable difference;on the condition of 200m'distance space of sheltbelts, P. Popularis'sheleter forest protect effect is superior to P. alba var.pyramidalis sheleter forest.â‘·The paper based on the result of the analytic hierarchy process, the result of Comprehensive benefit evaluation indicates that P. Popularis'sheleter forest is superior to P. alba var.pyramidalis sheleter forest., 200m's distance space of sheltbelts is superior to100m's.
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