Effects of Stand Density on Soil Properties and Water Conservation Function of Picea asperata Plantation in the Subalpine Region of Gansu Province

FENG Yi-ming, LI Yi, CAO Xiu-wen, LIU Jin-qian

JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (9) : 1529-1541.

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JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (9) : 1529-1541. DOI: 10.31497/zrzyxb.20170842
Resource Ecology

Effects of Stand Density on Soil Properties and Water Conservation Function of Picea asperata Plantation in the Subalpine Region of Gansu Province

  • FENG Yi-ming1,2,3, LI Yi1, CAO Xiu-wen2,3, LIU Jin-qian2,3
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Abstract

This paper aims to quantitatively analyze soil properties and water conservation function of Picea asperataa plantations with different stand densities and provide a theoretical basis for sustainable management of forests. Totally 28 plots with seven different densities in young Picea asperata plantation were investigated, and soil properties, water-holding capacities of litter and soil in these plots were measured. The results showed that: 1) Stand density has significant influence on soil bulk density, total porosity, organic matter content, soil water-holding capacity, litter accumulation, and litter water-holding capacity. With the increase of density, soil porosity, soil nutrient, litter accumulation, water-holding capacities of litter and soil all increase at first and then decrease, while bulk density decreases at first and then increases. The plantations with moderate density (1 550 trees/hm2) have the lowest soil bulk density (1.08 g/cm3), the greatest total porosity (58.99%), the highest organic matter contents (9.13%), the most litter accumulation (44.41 t/hm2), good soil water-holding capacity (3 898.93 t/hm2), and the highest litter water-holding capacity which is 4.49 times of that of plantation with density of 3 000 trees/hm2. 2) Based on the total water-holding capacity of litter and soil, water conservation function of the seven different stand densities in order are density of 1 550 trees/hm2 (4 068.36 t/hm2), density of 1 750 trees/hm2 (3 945.32 t/hm2), density of 1 350 trees/hm2 (3 698.39 t/hm2), density of 1 060 trees/hm2 (3 484.10 t/hm2), density of 2 300 trees/hm2 (3 157.60 t/hm2), density of 850 trees/hm2 (2 915.03 t/hm2), and density of 3 000 trees/hm2 (2 820.81 t/hm2). 3) According to this study, the forest with density about 1 550 trees/hm2 showed better soil properties and water conservation ability than other forests.

Key words

Picea asperata plantation / soil property / stand density / water conservation

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FENG Yi-ming, LI Yi, CAO Xiu-wen, LIU Jin-qian. Effects of Stand Density on Soil Properties and Water Conservation Function of Picea asperata Plantation in the Subalpine Region of Gansu Province[J]. JOURNAL OF NATURAL RESOURCES, 2018, 33(9): 1529-1541 https://doi.org/10.31497/zrzyxb.20170842

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Funding

; International Science and Technology Cooperation and Exchange, No. 2012DFR30830; Gansu Province Science and Technology Support Project, No. 144FKCK072; Forestry Science and Technology Project of Gansu, No. 2017kj041.
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