黄土高塬沟壑区油松人工林天然更新苗空间分布及影响因子研究

利用林木的天然更新能力恢复人工林生态系统的健康稳定，对丰富黄土高塬沟壑区人工林的群落结构和提高其生态防护功能具有重要意义。本项目以黄土高塬沟壑区塬面、沟坡和沟道三个典型地貌部位的油松人工林为研究对象，将林分中的冠层覆盖区与林隙作为一个连续整体设置调查样方。定位并测量上层木、更新苗及林下乔灌木的生长状况和群落特征，测定林下光环境、枯落物持水特性、土壤理化性质及土壤微生物等系列生态因子。旨在探明黄土高塬沟壑区油松人工林天然更新苗密度、生长和分布规律；揭示林分内油松更新苗的空间分布格局及空间关联性；通过拟合各生态因子与更新苗密度和生长之间的相关性，阐明影响更新苗生长和分布的关键因子。以期为实现黄土高塬沟壑区油松人工林的连续覆盖和可持续经营提供重要的理论基础和科学依据。

The natural regeneration is of great significance in restoring healthy and stable plantation ecosystems, especially in enriching the community structure and improving ecological protection of plantations in the loess-tableland and gully region of Loess Plateau. Chinese pine (Pinus tabulaeformis Carr.) plantation planted in the three typical geomorphological locations of tableland, gully slope and gully were taken as the study object. The canopy coverage area and gap are taken as a continuous whole to set up investigated quadrats. First, the growth status and community characteristics of overstory trees, regenerated trees, other understory trees and shrubs are located and investigated. Meanwhile, a series of ecological factors such as understory light environment, water-holding characteristics of litter, physicochemical properties and microorganism of soil were determined. The purpose of this study is to clarify the condition of density and growth, and the distribution of regenerated trees of Chinese pine. Then, the spatial pattern and spatial association will be revealed. Furthermore, the key factors affecting the growth and distribution of regenerated trees will be elucidated according to fitting the correlation between a series of ecological factors and the growth and distribution of regenerated trees. Therefore, it is expected to provide an important theoretical basis and scientific basis for the continuous coverage and sustainable management of Chinese pine plantation on the loess-tableland and gully region of Loess Plateau.