Sun Wenxian, Niu Xiaoyin, Wang Yongping, Yin Xianwei, Teng Haowei, Gao Peiling, Liu Aiju
School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255049, China.
School of Resources and Environmental Engineering, Shandong University of Technology, Zibo, 255049, China.
Environ Monit Assess. 2023 Jan 28;195(2):340. doi: 10.1007/s10661-023-10920-8.
Soil erosion and nutrient loss are important environmental and ecological problems in the Dianchi watershed in southwestern China. Woodlands-the primary land type in the Dianchi watershed-play an important ecological role in controlling soil and water loss. In this study, we compared soil erosion and loss of total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) in woodlands of different ages, i.e., young forest, medium forest, and near-mature forest, at the Dongda River catchment in south-western Dianchi watershed. Furthermore, changes in stoichiometries in soil were analyzed. The average degree of erosion of each forest age stage was below moderate. Based on the non-arable soil erosion modulus models of Cs and Pb, the soil erosion rates decreased gradually with the increasing forest age. The forest age affected soil nutrient distribution and loss. The losses of TOC and TP gradually decreased, while the losses of TN first increased and then decreased with the growth of forest age. TOC, TN, and TP were enriched in the topsoil. Forest age affected soil stoichiometry and soil nutrient supply level. In general, the forest can effectively reduce soil erosion and nutrient loss in the red soil area with the forest age increasing.
土壤侵蚀和养分流失是中国西南部滇池流域重要的环境和生态问题。林地是滇池流域的主要土地类型，在控制水土流失方面发挥着重要的生态作用。在本研究中，我们比较了滇池流域西南部东大河流域不同林龄（即幼龄林、中龄林和近成熟林）林地的土壤侵蚀以及总有机碳（TOC）、总氮（TN）和总磷（TP）的流失情况。此外，还分析了土壤化学计量比的变化。各林龄阶段的平均侵蚀程度均低于中度。基于铯（Cs）和铅（Pb）的非耕地土壤侵蚀模数模型，土壤侵蚀速率随林龄增加而逐渐降低。林龄影响土壤养分分布和流失。随着林龄增长，TOC和TP的流失逐渐减少，而TN的流失则先增加后减少。TOC、TN和TP在表层土壤中富集。林龄影响土壤化学计量比和土壤养分供应水平。总体而言，随着林龄增加，森林能够有效减少红壤地区的土壤侵蚀和养分流失。
