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为了尽快改变半干旱地区杨树低产面貌,从七十年代起,本着因地制宜的特点,开展了杨树旱作丰产技术试验研究。一、试验地区的自然概况和试验方法试区设于吉林省西北部的松嫩平原,地势平坦,海拔150—200m,属温带大陆性季风气候,年降水量400mm左右,年蒸发量1600ram以上;年平均气温2.3—4.2℃,极端最低气温零下36℃,极端最高气温40℃;年平均相对湿度60%,无霜期140天;年平均风速3—4.4m/s;年日照时数2850—3000小时;土壤瘠薄,有机质1%左右。
In order to change the appearance of low-yield poplar in semi-arid area as soon as possible, from the seventies onwards, in accordance with the characteristics of local conditions, carried out a poplar dry cultivation techniques for experimental research. The test area is located in the Songnen Plain in the northwestern part of Jilin Province. The test area is flat and has an elevation of 150-200m. It belongs to a temperate continental monsoon climate with an annual precipitation of about 400mm and an annual evaporation of 1600mm. Average temperature of 2.3-4.2 ℃, extreme minimum temperature of minus 36 ℃, extreme maximum temperature of 40 ℃; annual average relative humidity of 60%, frost-free period of 140 days; annual average wind speed of 3-4.4m / s; annual sunshine hours of 2850-3000 hours; Soil infertility, about 1% organic matter.