江西省石城县降雨径流对森林质量的响应

  目的  分析江西省石城县域降雨径流和森林质量年代变化特征及规律，研究降雨-径流-森林之间的关系，为定量监测和科学评价南方红壤丘陵区水土流失与生态环境状况提供依据。  方法  根据石城县域1989?2018年的天然降雨、径流序列数据以及不同年代遥感影像图，采用小波分析、遥感监督解译及森林质量等级判定等方法。  结果  ①石城县域降雨径流随着年际变化表现出缓慢下降趋势，但下降趋势不显著；②森林质量指数随着解析年份的增加整体呈上升?下降?上升趋势；③森林质量提升具有显著滞洪作用；④建立石城县域小波模型，径流深与降雨量呈正相关，与森林质量指数呈负相关。  结论  森林质量的提升会加强森林涵养水源能力和森林滞洪作用。图4表5参27

Response of rainfall runoff to forest quality in Shicheng County,Jiangxi Province

  Objective  The study aims to explore the characteristics and laws of the chronological change of rainfall runoff and forest quality in Shicheng County of Jiangxi Province, and the relationship between rainfall, runoff and forest, so as to provide basis for quantitative monitoring and scientific evaluation of soil erosion and ecological environment in the red soil hilly area in southern China.  Method  Based on the natural rainfall and runoff sequence data of Shicheng County from 1989 to 2018 and remote sensing image maps in different years, the methods of wavelet analysis, remote sensing supervision and interpretation, and forest quality grade determination were employed.  Result  (1) Rainfall and runoff showed a slow downward trend with inter-annual changes, but the decreasing trend was not significant. (2) The forest quality index showed an upward-downward-upward trend with the increase of resolution years. (3) The improvement of forest quality had a significant role in flood detention. (4) The wavelet model of Shicheng County showed the runoff depth was positively correlated with precipitation and negatively correlated with forest quality index.  Conclusion  The improvement of forest quality can strengthen the ability of forest water conservation and forest flood detention. [Ch, 4 fig. 5 tab. 27 ref.]