Comprehensive Evaluation of Soil Nutrients after Mixed Transformation of Pinus Sylvestris var.Mngolica Plantation

doi:10.13466/j.cnki.lyzygl.2021.01.017

Abstract

Abstract:

In order to explore the influence mechanism of different mixed models on soil nutrients,a 38-year-old Pinus sylvestris var.mongolica plantation is selected as the research object.After zonal thinning,Pinus sylvestris var.mongolica,Populus alba and Acer mono are planted in the thinning zone to form a mixed forest.Canonical correspondence and principal component analysis are used to compare the differences and corresponding relationships of soil chemical properties and enzyme activities in mixed forest.The results showed that the soil chemical properties after mixed transformation are higher than those of the control,and the contents of organic matter and available nitrogen in the plots of P.sylvestris var.mongolica×Acer mono(PAM2) and P.sylvestris var.mongolica×Populus alba(PPM2) were the highest,which were 14.74 g/kg and 49.63 mg/kg,respectively,but the content of available phosphorus is lower than that of P.sylvestris var.mongolica×P.sylvestris var.mongolica plots.Compared with the control,the soil enzyme activities of all plots are increased to varying degrees,and the soil enzyme activities of P.sylvestris var.mongolica×Populus alba are the best.In general,the comprehensive score of soil nutrient factors in the mixed sample plot is higher than that of the control,and that of the coniferous broad-leaved mixed forest is generally higher than that of the uneven aged Pinus sylvestris var.mongolica.Therefore,the construction of mixed forest is an effective way to improve soil ecology of Pinus sylvestris var.mongolica plantation in Horqin sandy land and prolong the life cycle of protective forest.

Key words: Pinus sylvestris var.mongolica, mixed transformation, soil chemical properties, soil enzyme activities, Horqin sandy land

CLC Number:

S714.8

SHI Liang, ZHANG Risheng. Comprehensive Evaluation of Soil Nutrients after Mixed Transformation of Pinus Sylvestris var.Mngolica Plantation[J]. FOREST RESOURCES WANAGEMENT, 2021, (1): 132-139.

Figures/Tables 5

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样地	间伐宽度 /m	树种组成	保留樟子松			间种树种
样地	间伐宽度 /m	树种组成	林龄/a	平均树高/m	平均胸径/cm	林龄/a	平均树高/m	平均胸径/cm
PP1	9	樟×樟	38	10.80±0.32	19.02±0.80	8	1.54±0.05	4.09±0.20
PPM1	9	樟×杨	38	9.05±0.50	18.00±1.10	6	6.52±0.22	5.12±0.40
PAM1	9	樟×槭	38	10.85±0.70	18.33±0.90	7	3.0±0.10	3.25±0.33
PP2	13	樟×樟	38	10.50±0.50	18.67±1.10	8	1.61±0.12	4.01±0.25
PPM2	13	樟×杨	38	10.56±0.51	18.20±1.37	6	7.08±0.15	5.82±0.49
PAM2	13	樟×槭	38	9.50±0.33	17.56±0.20	7	2.8±0.35	3.30±0.10
CK	—	樟	38	10.00±0.70	18.20±0.90	—	—	—

样地	主成分得分			综合得分	排名
样地	F₁	F₂	F₃	综合得分	排名
PP1	-0.02	1.71	0.32	0.27	4
PPM1	0.46	0.92	-0.46	0.41	2
PAM1	-0.19	-0.66	-1.50	-0.42	6
PP2	-0.06	0.14	0.93	0.09	5
PPM2	1.17	-1.14	1.23	0.84	1
PAM2	0.63	-0.42	-0.95	0.29	3
CK	-2.00	-0.55	0.43	-1.49	7