论文部分内容阅读
松嫩平原西部是指黑龙江省嫩江地区和吉林省白城地区的平原部分。砂地土壤分布于嫩江、第二松花江及其支流各河的高河漫滩、低阶地及湖沼边缘地区,总面积约一千五百万亩,是当地的耕作土壤,也是主要的放牧地。近年来,由于无计划地开垦,风砂危害越来越突出,迫切需要摸清砂地土壤状况,以便合理利用土地资源,消除砂害。 松嫩平原是由松花江、嫩江和其支流的沉积物组成的冲积平原,地势低平,河曲十分发育,高河漫滩及低阶地上的冲积砂层受风吹扬,形成广泛的砂垄、砂丘、砂岗等,相对高度一般5米左右。 本区属温带半湿润季风气候,年均温2～5℃,无霜期120～160天,年降水量400～600毫米,6～8月份占65～70％,蒸发较强,干燥度近于或略大于1。
The western part of Songnen Plain refers to the plain part of Nenjiang in Heilongjiang Province and Baicheng in Jilin Province. Sandy soil is distributed in the floodplains, lowlands and lakeside margins of the Nenjiang River and the second Songhua River and its tributaries. The total area is about 15 million mu, which is the local cultivated soil and the main grazing land. In recent years, as a result of unplanned reclamation, the hazards of wind and sand have become more and more prominent. Therefore, it is urgent to find out the status of sand so as to make rational use of land resources and eliminate sand damage. The Songnen Plain is an alluvial plain consisting of sediments from the Songhua River, Nenjiang River and its tributaries. The terrain is low and the meanders are well developed. The alluvial sand layers along the high floodplains and low-lying ground are blown by the wind to form a wide range of sandy ridges and sand dunes , Sand hill, the relative height of about 5 meters. The area is temperate semi-humid monsoon climate, with an average annual temperature of 2 ~ 5 ℃, frost-free period of 120 to 160 days, the annual rainfall of 400 to 600 mm, 6 to August accounted for 65 to 70%, strong evaporation, dryness near or slightly Greater than 1.