Response of Leaf Functional Traits of Young Pinus sylvestris var.mongolica to Microtopography in the Afforestation Area of Northern Hebei Province
[Objective]To explore the effects of different terrains on the functional traits of young Pinus sylvestris var.mongolica leaves in the arid rocky sunny slopes of the northern mountainous areas of Hebei Province.[Method]Taking the young artificial Pinus sylvestris var.mongolica forest,a common afforestation tree in the sandy land in northern China,as the research object,the method of plot layout and vegetation investigation was adopted.Leaf area(LA),leaf length(LL),leaf width(LW),leaf curvature(LC),specific leaf area(SLA),total nitrogen(N),total phosphorus(P),total potassium(K)and total carbon(C)of young trees were compared by variance analysis at different slope s and positions.[Result](1)In terms of leaf morphology,the LL and SLA of flat land were significantly higher than those of slope land by 15.25%and 5.52%.In terms of leaf nutrients,except for C,the other nutrient indexes showed significant differences between flat land and slope land.The N,P and K of flat land were 3.76%,31.14%and 9.11%higher than those of slope land,respectively.(2)For different slopes,there are significant differences except LC.LA and LL showed the highest steep slope,and the steep slope was 20.8%and 14.9%higher than the middle slope,respectively.LW values of gentle slope were the largest,8.9%and 5.3%higher than those of steep slope and medium slope,respectively.The SLAs of gentle and medium slopes were significantly 8.6%and 8.5%higher than those of steep slopes.The content of total nitrogen(N)and total potassium(K)decreased significantly with the increase of slope,while the content of total phosphorus(P)was on the contrary,and the content of middle slope and steep slope was significantly higher than that of gentle slope by 31.3%and 30.2%.(3)The comprehensive scores of leaf functional traits showed that the medium slope and gentle slope had positive effects on leaf functional development of Pinus sylvestris var.mongolica,while the steep slope had negative effects on leaf development.[Conclusion]This study comprehensively analyzed the response of leaf functional traits of young Pinus sylvestris var.mongolica to microtopography,and provided a theoretical basis for the integration and optimization of difficult site vegetation restoration technology.
mountainous area of northern Hebei provincePinus sylvestris var.mongolicaexternal morphologyleaf nutrientsmicrotopography
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