Coupling relationship between stand structure and color patch of Platycladus orientalis plantations

ObjectiveColor is not only the most sensitive information element in forest landscape, but also an important indicator to measure the quality of landscape. And forest structure is an important factor affecting the quality of forest landscape. So this paper aims to explore the influencing mechanism of the landscape quality in Platycladus orientalis plantations in Beijing mountain area through the coupling relation of stand structure and color patch.

MethodStand structure factors were constructed by principal component analysis, and the coupling correlation degree between forest structure and landscape color patches was studied by grey correlation analysis, and the change law between them was studied by univariate variance analysis and multiple comparison.

Result(1) The influence degree of four factors on stand structure is, in order, forest space factor > vegetation growth factor > forest height factor > forest competition factor. (2) The coupling correlation between forest structure and landscape color patches was 0.6, which was a weak coordination degree. Among them, the indicators with high correlation coupling degree included: forest space factor with LPI and SHDI; vegetation growth factor with SPL and CPC; forest height factor with SHDI and SPL and CPC; forest competition factor with CPB. (3) Vegetation growth only had a significant impact on LPI at the medium and low levels; The relative height of forest had significant effects on CPB and CPC only at a higher level. However, the intensity of intra-forest competition had a significant impact on CPB and CPC at the medium and low levels, and on the higher level, it had a significant impact on SPL.

ConclusionThe releationship between color patch and stand structure is medium correlation degree, and stand structure actors influence on color patch differences: color patch index affected by different stand structure factors, and color patch index affected by the same stand structure factor in different levels, and degree of influence on colour patch is not the same.So there is a relatively complex coupling relationship between them.