樟子松固沙林土壤理化特性对林分密度的响应

Abstract

Abstract:

In this study, the 23-27-year aged forests with stand densities of 625 (P₁), 775 (P₂), 1 025 (P₃), 1 175 (P₄) and 1 250 (P₅) plants/ha in the Zhanggutai region were selected. The purpose of the study was to analyze the effect of stand density on soil physiochemical properties at 0-100 cm depth. The results showed that the total nitrogen content in 0-10-cm soil layer and the bulk density in 20-40-cm soil layer increased with the increase of stand density, and the total nitrogen content and bulk density in plot P₅were significantly higher than those in plot P₁ (P<0.05). The total potassium content in 0-80-cm soil layer and the pH value in 0-60-cm soil layer increased at first and then decreased with the increase of stand density, and they were the highest in plot P₃. The total potassium content in 10-60-cm soil layer in plot P₃was significantly higher than that in plot P₁ (P<0.05), and the pH value in 0-40-cm soil layer was significantly higher than that in other plots (P<0.05). The total phosphorus content in 0-10-cm soil layer decreased with the increase of stand density, and it in plot P₁ was significantly higher than that in plots P₃-P₅ (P<0.05). The available potassium content in 0-40-cm soil layer in plot P₄ or P₅ was significantly higher than that in plots P₁ and P₂ (P<0.05), and also significantly higher than that in 40-100-cm soil layer in plot P₃ (P<0.05). The porosity in 40-100-cm soil layer in plots P₂-P₄ was lower than that in plots P₁ and P₅. Considering the influence of stand density on soil physiochemical properties of middle-aged P. sylvestris var. mongolica plantation, the rational stand density of P. sylvestris var. mongolica plantation in the study area should be 1 025-1 175 plants·hm^-2. Intermediate cuttings and other forest management measures could be taken to regulate the stand density so as to ensure the good soil conditions for the growth of sand-fixing forests of P. sylvestris var. mongolica.

Key words: Pinus sylvestris var. mongolica')">

Pinus sylvestris var. mongolica, plantation, stand density, soil property, soil layer, Zhanggutai region

YU Dong-wei, LEI Ze-yong, ZHAO Guo-jun, ZHANG Yan-song, YU De-liang, BAI Jin-ning, LI Yao. Response of Soil Physiochemical Properties under Sand-Fixation Forest of Pinus sylvestris var. mongolica to Stand Density[J].Arid Zone Research, 2020, 37(1): 134-141.

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Response of Soil Physiochemical Properties under Sand-Fixation Forest of Pinus sylvestris var. mongolica to Stand Density

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