Ma Ming, Sun Tao, Li Ding-Kai, Wang Ding-Yong
College of Resource and Environment, Southwest University, Chongqing 400715, China.
Simian Mountain Forest Resources Administration, Jiangjin District, Chongqing 400296, China.
Huan Jing Ke Xue. 2017 Dec 8;38(12):5056-5062. doi: 10.13227/j.hjkx.201704208.
A typical forest stand on the subtropical Jinyun Mountain in China was selected to investigate water quality and interception characteristics for several important ions at different levels in the subtropical forest ecosystem. Based on field and laboratory experiments, the effect of precipitation, throughfall, litterfall, and soil percolation on water quality and ionic interception were investigated from September 2013 to August 2014. Results indicated that the rainfall on Jinyun Mountain was obviously acidic, with an average pH of 4.75. The soil and canopy can elevate the pH of rainfall, while the soil had a greater capability for adjusting pH than did the forest canopy. In addition, the concentrations of NH, SO, PO, Mg, Ca, and K in the litterfall increased with litterfall tissue disintegration, while the other ions decreased. Moreover, functional groups and colloids in the soil can bind or neutralize many ions, such as NO, SO, NH, PO, K, and Mg. However, some ions were released from the soil by erosion from acid rain over a long time. Generally, the forest ecosystem is a sink for ions found in precipitation with diverse functions for different layers, and the forest canopy has the highest interception capacity for the ions found in precipitation.
在中国亚热带缙云山选取典型林分，研究亚热带森林生态系统不同层次几种重要离子的水质及截留特征。基于野外和实验室实验，于2013年9月至2014年8月研究了降雨、穿透雨、凋落物和土壤渗滤对水质及离子截留的影响。结果表明，缙云山降雨明显呈酸性，平均pH值为4.75。土壤和林冠层可提高降雨的pH值，且土壤调节pH值的能力比林冠层更强。此外，凋落物中NH、SO、PO、Mg、Ca和K的浓度随凋落物组织分解而增加，而其他离子则减少。而且，土壤中的官能团和胶体可结合或中和许多离子，如NO、SO、NH、PO、K和Mg。然而，长期酸雨侵蚀会使土壤释放一些离子。总体而言，森林生态系统是降水中离子的汇，不同层次具有不同功能，林冠层对降水中离子的截留能力最强。
