Research on Understory Vegetation and Soil Physical-chemical Properties of Teak Plantation with Difference Stand Densities

doi:10.7525/j.issn.1673-5102.2017.02.007

Abstract

Abstract: We studied the effect of teak(Tectona grandis L.f) plantations with different densities on understory vegetation and soil physical-chemical properties for providing theoretical basis for establishment and sustainable management of teak plantations. We used teak plantations at age of 14-16 with different stand densities(650, 900, 1 050, 1 200 and 1 450 tree·hm^-2) in Jieyang City of Guangdong Province in the experiment. We recorded the species name, quantity, height and coverage of understory vegetation by plant quadrate, and measured soil physical-chemical properties by collecting soil samples from 0-20 and 20-40 cm depths, respectively. We investigated the diversity index of understory vegetation and soil physical-chemical property to evaluate site quality of teak plantation under different densities by principal component analysis. The coverage of understory vegetation was decreased with the increase of stand density. The dominant species of herbs were changed from sun species to shade-tolerant species with the increase of stand density, and the Shannon-Wiener index, Simpson index, Richness index, and Evenness index jointly showed a tendency that falls after increases first along with the raise of stand density. The physical-chemical properties in the upper layer of soil were superior to these in the deeper layer of soil at the same density. With the increase of stand density, the soil physical-chemical properties presented a change process from first improvement to degradation. The capillary porosity, non-capillary porosity, available K, available P, total P, exchangeable acid and exchangeable aluminum of soil showed significant difference among the different stand densities(P<0.05). By biodiversity indexes and physical-chemical properties of principal component analysis, the order of the composite score of different stand densities on species diversity and soil physical-chemical properties from high to low was:1 050 tree·hm^-2(4.82), 900 tree·hm^-2(1.58), 650 tree·hm^-2(-1.30), 1 200 tree·hm^-2(-1.81) and 1 450 tree·hm^-2(-3.29). By principal component analysis, the stand density(1 050 tree·hm^-2) was more favorable to maintaining better undergrowth species diversity and soil physical-chemical properties. Stand density would be adjusted reasonably according to the actual situation in the management process of teak plantation.

Key words: teak plantation, stand density, understory vegetation, soil physical-chemical properties

CLC Number:

S753

ZHOU Shu-Ping, LIANG Kun-Nan, DU Jiang, LI Bi-Jun, ZHOU Zai-Zhi, HUANG Gui-Hua. Research on Understory Vegetation and Soil Physical-chemical Properties of Teak Plantation with Difference Stand Densities[J]. Bulletin of Botanical Research, 2017, 37(2): 200-210.

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