Responses of intra-annual runoffto forest recovery patterns in subtropical China

• 作者: Zhipeng Xu Wenfei Liu Qiang Li Jianping Wu Honglang Duan Guomin Huang Yizao Ge
• 来源期刊: 林业研究（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 1479-1488
• 页数: 10页
• 语种: 英文

摘要

Forest recovery plays a critical role in regulating eco-hydrological processes in forested watersheds. However, characteristics of the intra-annual runoffvariation associated with different forest recovery patterns remain poorly under-stood. In this study, three forest change periods were identi-fied, the baseline period (1961-1985), reforestation period (1986 ? 2000) and fruit tree planting period (2001-2016). We selected the magnitude of seasonal runoff(wet and dry seasons) and distribution characteristics, i.e., non-uniformity coefficient ( C v ), complete accommodation coefficient ( C r ), concentration ratio ( C n ), concentration period ( C d ), absolute variation ratio (Δ R ) and relative variation ratio ( C max ). The pair-wise approach evaluated the intra-annual runoffvaria-tion characteristics between forest change periods. Results indicate that reforestation decreased wet season runoffand increased dry season runoff. In contrast, fruit tree planting increased wet season runoffand had no significant effect on dry season runoff. For intra-annual runoffdistribution char-acteristics, reforestation significantly reduced the C v , Cr , C n and C max . Distribution of the intra-annual runoffin the fruit tree planting period was not significantly different from the baseline. We concluded that reforestation reduced the occur-ance of extreme water conditions in wet and dry seasons and effectively increased the stability of the intra-annual runoff. In contrast, fruit tree planting increased instability and fluc-tuation of the intra-annual runoffafter reforestation. The characteristics of the intra-annual runoffto fruit tree plant-ing was similar to those of the baseline. Therefore, adopting fruit tree planting practices to regulate intra-annual runoffcharacteristics may not be a practical approach, and impacts of different reforestation practices should be ascertained in our study region. The implications of this study should guide regional land-water management, and this study adds to the understanding of the impacts gained in forest cover on hydrology.