Since the shelterbelt systems of 1,092,260 hm^2have been established for thirteenyears from 1978,have formed 526,541 networks and protected 13,619,400 hm^2 land in westernpart of Northeast region of China.According to the research work we did in the last five years,the results of research project showed that the shelterbelts had improved the environmentsignificantly.A parameter of comprehensive effects of temperature,moisture and wind in thenetworks(E_c=246.52-12.17E+0.58T+6.58U)which is an active method to estimate the effects ofshelterbelt on farmland,is around 21.1-30.9mm/month improving the moisture state in dryseason,helping the crop yield increasing on the average by 19.8%.The effective accumulatedtemperature(≥10℃)incrcases by 71℃;the cropland area which suffered from wind and frostdamage decreases by 80-90%,the grass coverage on the pastureland and grass production in-creases by 13% and by 49.4-72%,rough protein,rough fat and nitrogen-free extract of grassincrease by 3.34%,2.4% and 8.
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