论文部分内容阅读
我县位于赣南,与粤北相邻,全县的水土流失面积占山地面积的24.1%。本文拟就我县水土流失的成因及治理作一简要介绍。 一、自然因素 (一)气温。我县地处亚热带季风区,冬夏气温相差40℃左右,绝对最低气温为-5.8℃,绝对最高气温为39℃,而裸露的地表温度冬夏相差在80℃以上。地表和岩石因热胀冷缩而破碎。 (二)降雨。我县年平均降雨量为1474毫米,年降雨量最多的一年达2148.1毫米,最少的一年也有935.2毫米。据最近20年的统计,暴雨次数共达115次,平均每年有5次;且降雨量又集中在4～8月份,占全年降雨量的70%。
My county is located in Gannan, adjacent to northern Guangdong. The county’s soil erosion area accounts for 24.1% of the mountainous area. This paper will make a brief introduction to the cause and management of soil and water loss in our county. First, the natural factors (a) temperature. My county is located in the subtropical monsoon region, summer and winter temperature difference of about 40 ℃, the absolute minimum temperature of -5.8 ℃, the absolute maximum temperature of 39 ℃, while the bare surface temperature difference between winter and summer in more than 80 ℃. Surface and rock broken due to thermal expansion and contraction. (B) rainfall. The average annual rainfall in our county is 1,474 millimeters. The year with the highest annual rainfall is 2148.1 millimeters and the minimum rainfall is 935.2 millimeters. According to the statistics of the past 20 years, the total number of stormstorms has reached 115 times, an average of five times a year; and the rainfall is concentrated in April-August, accounting for 70% of the annual rainfall.