Huang Ting, Hao Jia-Tian, DU Yi-Chen, Tian Cui-Cui, Zhang Jing, Wang Hai, Hou Lin
College of Forestry, Northwest A&F University, Yangling 712100, Shaanxi, China.
Northwest Surveying, Planning and Designing Institute of National Forestry and Grassland Administration, Xi'an 710048, China.
Ying Yong Sheng Tai Xue Bao. 2022 Feb;33(2):297-303. doi: 10.13287/j.1001-9332.202202.006.
The aims of this study were to clarify the regeneration characteristics and dominant factors affecting the regeneration of three natural forests in the Three-River Headwater Region of Qinghai Province, and thus to provide a reference for the protection and management of natural forests. We evaluated the natural regeneration levels of forests, and the effects of stand factors and soil factors on natural regeneration. The results showed that three natural forests were poorly regenerated, with insufficient regeneration potential. The average regeneration density of forest, forest and forest was 332, 279 and 202 ind·hm, respectively. The height range of regenerate individuals was concentrated in 1-3 m. Only a few seedlings (12 ind·hm) were found under the forest, and no seedlings were found under the and forests. The regeneration density of forest was significantly positively correlated with stand density, soil organic matter and available phosphorus, and negatively correlated with shrub coverage. The regeneration density of forest was significantly negatively correlated with herb coverage, human disturbance degree, woodland slope and soil total nitrogen, and positively correlated with soil water content. The regeneration density of forest was significantly positively correlated with stand density, soil available potassium and available phosphorus, but negatively correlated with herb coverage. Results of multiple regression analysis showed that the regeneration of forest was mainly affected by understory shrub coverage and soil available phosphorus, that of forest was mainly affected by understory herb coverage, soil total nitrogen and human disturbance, and that of forest was mainly affected by understory herb coverage and soil available potassium. It was necessary to strengthen forest enclosure, management and protection, rationally regu-late the coverage of understory vegetation, increase soil fertility and improve biotope in the forest, which would promote the protection and natural regeneration of natural forests in the Three-River Headwater Region.
本研究旨在阐明青海省三江源地区三种天然林的更新特征及影响更新的主导因素，从而为天然林的保护与管理提供参考。我们评估了森林的天然更新水平，以及林分因子和土壤因子对天然更新的影响。结果表明，三种天然林更新不良，更新潜力不足。森林、森林和森林的平均更新密度分别为332、279和202株·hm。更新个体的高度范围集中在1 - 3米。在森林下仅发现少数幼苗（12株·hm），在森林和森林下未发现幼苗。森林的更新密度与林分密度、土壤有机质和有效磷显著正相关，与灌木盖度负相关。森林的更新密度与草本盖度、人为干扰程度、林地坡度和土壤全氮显著负相关，与土壤含水量正相关。森林的更新密度与林分密度、土壤速效钾和有效磷显著正相关，但与草本盖度负相关。多元回归分析结果表明，森林的更新主要受林下灌木盖度和土壤有效磷的影响，森林的更新主要受林下草本盖度、土壤全氮和人为干扰的影响，森林的更新主要受林下草本盖度和土壤速效钾的影响。有必要加强森林封育、管理和保护，合理调控林下植被盖度，提高土壤肥力，改善森林生境，以促进三江源地区天然林的保护和天然更新。
