Effects of stand density on understory species diversity and soil physicochemical properties of Pinus massoniana plantation.

doi:10.13287/j.1001-9332.201803.004

Abstract

Abstract: We analyzed understory species diversity, soil physicochemical traits and their relationships in the 25-year-old non-commercial Pinus massoniana plantations with five different stand densities, i.e., 1057, 1136, 1231, 1383 and 1515 trees·hm^-2, in Wenfeng Mountain, Xinjin District, Sichuan Province, China. The results showed that a total of 110 species were found, belonging to 57 families and 98 genera. With the increase of tree density, the understory species showed a succession pattern from positive to moderate to shady. Different densities had significant effects on the contents of total potassium and organic matter in the soils. With the increase ofdensity, the contents of organic matter and total potassium in understory vegetation first increased and then decreased. The trends of the relationship between both diversity and soil physiochemical characteristics and tree density were similar. Both of them increased with the increase of density, with the maximum value presented at the density of 1136 trees·hm^-2. The concentrations of total phosphorus, available potassium, total potassium and total nitrogen was closely related to plant diversity index. The results suggested that the density at 1136 trees·hm^-2 would be more beneficial to improve the stability of species diversity and soil fertility of P. massoniana non-commercial plantations in Wenfeng Mountain.

SUN Qian-hui, WU Xia, WANG Mei-zhen, ZHANG Liu-hua, YAO Xiao-lan, QI Jin-qiu, HAO Jian-feng. Effects of stand density on understory species diversity and soil physicochemical properties of Pinus massoniana plantation.[J]. Chinese Journal of Applied Ecology, 2018, 29(3): 732-738.

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