Soil Physicochemical Properties of Pinus sylvestris var. mongolica Plantations of Different Ages in Minqin

doi:10.11924/j.issn.1000-6850.casb2022-0791

Abstract

Abstract:

Taking the artificial forest land of Pinus sylvestris var. mongolica of different ages in Minqin National Study Station on Desert Steppe Ecosystem as the object, the soil physicochemical properties of P. sylvestris var. mongolica of different ages were measured, and the nutrient status of P. sylvestris var. mongolica forests were compared and analyzed. The results are as follows. (1) The vertical change of soil water content of different forest ages is not significant, and the soil water content changes significantly in the same soil layer of different forest ages. The surface soil water content of the middle-aged forest is the lowest of 4.34%, and the water content of the 40-50 cm soil layer of the near-mature forest is the highest of 17.21%, significantly higher than that of other forest ages (P<0.05). (2) There are significant differences in soil pH and electric conductivity in the P. sylvestris var. mongolica plantations of different ages. The pH of the middle-aged forest is the lowest at different soil depths. The soil pH in different soil layers of each forest age group is greater than 8, showing weak alkalinity. The soil electric conductivity is in the order of middle-aged forest> young-aged forest> near-mature forest, and the soil electric conductivity of the middle-aged forest is significantly higher than that of the young forest, showing a decreasing-rising trend with the increase of the soil depth. (3) The forest age has a significant effect on the soil nutrients of P. sylvestris var. mongolica plantations. The content of total nitrogen, organic matter, NH₃-N (ammonia nitrogen), available phosphorus and effective phosphorus in the middle-aged forest are higher than those of other forest ages, and the difference is significant (P<0.05). (4) Principal component analysis of soil fertility of different forest ages shows that the total soil nitrogen, organic matter, available phosphorus, NO₂-N (nitrous nitrogen) and NH₃-N are in the first three main components.

Key words: Pinus sylvestris var. mongolica plantation, forest age, soil physicochemical properties, soil fertility, Minqin

TANG Weidong, WEI Linyuan, KANG Caizhou, WANG Duoze, QIU Xiaona, ZHANG Weixing, ZHANG Xiaojuan. Soil Physicochemical Properties of Pinus sylvestris var. mongolica Plantations of Different Ages in Minqin[J]. Chinese Agricultural Science Bulletin, 2023, 39(4): 93-98.

Figures/Tables 7

References 30

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龄组	林龄/a	海拔/m	东经	北纬	造林密度	郁闭度	土壤类型
幼龄林	≤20	1378	102°58'30.0"	38°35'17.22"	2 m×3 m	0.3	沙土+粘土
中龄林	21~30	1378	102°58'33.1"	38°35'33.13"	2 m×3 m	0.33
近熟林	31~40	1378	102°57'57.51"	38°34'23.55"	2 m×3 m	0.27

龄组	林龄/a	海拔/m	东经	北纬	造林密度	郁闭度	土壤类型
幼龄林	≤20	1378	102°58'30.0"	38°35'17.22"	2 m×3 m	0.3	沙土+粘土
中龄林	21~30	1378	102°58'33.1"	38°35'33.13"	2 m×3 m	0.33
近熟林	31~40	1378	102°57'57.51"	38°34'23.55"	2 m×3 m	0.27

龄组	0~5 cm土层	5~10 cm土层	10~20 cm土层	20~30 cm土层	30~40 cm土层	40~50 cm土层
幼龄林	5.03±0.67aA	7.31±1.19bA	8.96±0.32bcB	9.42±0.44bcB	9.49±0.50bcAB	9.76±0.97cA
中龄林	4.34±0.39aA	5.56±0.81aA	5.56±0.86aA	5.61±1.33aA	6.50±1.36aA	14.52±3.99bA
近熟林	4.93±0.66aA	7.25±1.19aA	8.90±0.32abB	9.61±0.44abB	12.13±0.50bB	17.21±0.97cA

龄组	0~5 cm土层	5~10 cm土层	10~20 cm土层	20~30 cm土层	30~40 cm土层	40~50 cm土层
幼龄林	5.03±0.67aA	7.31±1.19bA	8.96±0.32bcB	9.42±0.44bcB	9.49±0.50bcAB	9.76±0.97cA
中龄林	4.34±0.39aA	5.56±0.81aA	5.56±0.86aA	5.61±1.33aA	6.50±1.36aA	14.52±3.99bA
近熟林	4.93±0.66aA	7.25±1.19aA	8.90±0.32abB	9.61±0.44abB	12.13±0.50bB	17.21±0.97cA

林龄	全氮/%	有机质/%	速效P/(mg/100 g)	NH₃-N/(mg/kg)	NO₂-N/(mg/kg)	有效P/(mg/kg)
幼龄林	0.046±0.005a	0.10±0.08a	0.60±0.20ab	1.54±0.27b	0.22±0.02ab	8.18±0.54a
中龄林	0.063±0.006b	1.37±0.17b	1.30±0.26b	0.72±0.16a	0.23±0.005a	9.67±0.76b
近熟林	0.044±0.010a	1.01±0.19a	0.98±0.20ab	1.8±0.71b	0.24±0.016b	9.11±0.48ab