论文部分内容阅读
1观测地点自然概况兴胜村农田防护林体系是典型的东北农区林网网格化的防护林体系，该村位于北纬47”28’，东经124”25’，年均温度ZC，年均有效积温2500℃，年降水量400～450mm，年蒸发量1589．4mm。干燥度1．4，年均相对湿度64％，森林覆被率30％。土壤为典型的碳酸盐黑钙上
1 Natural Site of Survey The farmland shelterbelt system in Xingsheng Village is a typical shelterbelt forest system of northeast farmland network. The village is located at 47’28’N, 124’25’E, annual average temperature ZC, annual average effective accumulated temperature 2500 ℃, annual precipitation 400 ~ 450mm, the annual evaporation 1589.4mm. Dryness 1.4, average annual relative humidity 64%, forest cover rate 30%. The soil is typical carbonate black calcium