Small-scale Spatiotemporal Changes In The Carbon And Nitrogen Phosphorus Metrology Of The Mountain Larix Principis-rupprechtii

Ecological chemometrics enables the study of ecological processes at the elemental level and the relationship between biotic and abiotic environments in the process.Based on the Larix principis-rupprechtii,an important dominant species in the mountain forests of North China,the Larix principis-rupprechtii forests with the same altitude and different ages were selected as the research plots.Based on the time scale,the leaves,stems,roots,nitrogen and phosphorus of Larix principis-rupprechtii were studied.The chemometric changes were studied.At the same time,the small-scale spatial variation of carbon,nitrogen and phosphorus in the organs of Larix principis-rupprechtii and its environmental impact mechanism were studied.The leaf morphological characteristics of Larix gmelinii varying with its age and altitude and their correlation with the measurement of carbon,nitrogen and phosphorus in leaves,roots and soils were studied.The study aims to understand the ecological stoichiometry dynamic distribution pattern and balance theory of Larix principis-rupprechtii growth,and to help detect the carbon,nitrogen and phosphorus regulation mechanisms of Larix principis-rupprechtii growth.The results show:(1)With the growth of tree age,leaf length,leaf aspect ratio and leaf circumference increased significantly,leaf area increased first and then decreased,which was opposite to leaf area;leaf C and N content increased,P content decreased,C:N,C:P N:P decreased;dry C,N,P and their stoichiometric ratios were significantly different between the ages of the trees;root C and P content reached the highest value of 60 a at 60 a,and the N content reached 20 a.The highest value.(2)With the increase of altitude,the leaf length and leaf width increased as a whole.The leaf circumference and leaf area increased first and then decreased,and the leaf area showed a downward trend.The leaf C content of each tree showed an upward trend,and the N content was slow.After rising,the R content increased slowly and there was no significant difference with the altitude.The measurement ratio showed a downward trend;the dry C content showed an upward trend,and the N and P contents both increased first and then decreased;the root C content showed an upward trend,N The content first rises and then decreases,and the P content slowly rises.(3)With the growth of tree age,leaves showed a small downward trend in the distribution of C,P and C:N content,which was basically stable in N,and showed a small upward trend in C:P and N:P content;dried in C and N.The distribution of P content showed an upward trend.Contrary to the leaf,it was basically stable in C:N,and showed a downward trend in C:P and N:P.The distribution of roots in C and P was stable,and N decreased slightly.Contrary to dryness,C:N,C:P,N:P is close to a stable trend.(4)With the elevation of altitude gradient,the distribution ratios of leaves,stems and roots in C,N,P and C:N showed a relatively stable trend;in the N:P content,the dry distribution was stable and the leaf allocation gradually increased.The roots gradually decrease;in the C:P content,the leaf distribution ratio increases first and then decreases,while the root distribution ratio is opposite,and the dry distribution is relatively stable.(5)There is a significant positive correlation between soil C,N,and P and altitude.There was a significant negative correlation between soil C,P and root N.There was a significant positive correlation between soil C,N,P and root P.Soil water content was significantly correlated with leaf dry weight and specific leaf area.Temperature and leaf N existed.Significant correlation;root C,N,P and leaf C,N,P were significantly correlated,root C: N,N: P and leaf C: P were significantly correlated,root N: P and leaf N: P were extremely significant Positive correlation;leaf morphology is positively correlated with leaf N and negatively correlated with leaf P.Comprehensive research shows that environmental factors such as soil related to altitude affect the root system and further affect leaf morphology and C,N,P metrology,and the coordinated distribution of C,N,and P among organs,thus playing a role in Larix principis-rupprechtii Regulatory mechanisms of growth.