Mineral nutrient diagnosis of young teak (Tectona grandis) plantations grown on acidic soils in south China 4 th International Congress on Planted Forests, 23-27 October, 2018, Beijing, China Zaizhi Zhou Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guagnzhou
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Mineral nutrient diagnosis of young teak
(Tectona grandis) plantations grown on
acidic soils in south China
4th International Congress on Planted Forests,
23-27 October, 2018, Beijing, China
Zaizhi Zhou
Research Institute of Tropical Forestry,
Chinese Academy of Forestry, Guagnzhou
1. Introduction
Teak is an important timber, exotic tree species in China.
Investment interests from private companies and individuals in southern China.
More than 3000 ha of plantations have been established using superior clones
in recent decades (Liang et al. 2011) .
Teak plantation in Guangdong Teak plantation in Yunnan Teak plantation in Guizhou
1. Introduction
Teak grows well in some suitable areas with intensive cultivation in China.
Teak plantations in Guangxi Province,planted in 2017and 2018
1. Introduction
About 60% of the soils in these areas are acidic (pH<5.5) with an excess of
H+, Al3+ and Mn2+ (Pan et al. 1999), and infertile.
Teak growth can be limited on nutrient-poor soils and acidic sites.
Nutrition disorder and Poor growth
Fertilizing is necessary measure to promote teak growth.
To improve and obtain sustainable yields, the management of all
essential nutrients needs to be optimized (Goulding et al. 2008), which
requires that the growth and nutrient status of trees be accurately
analyzed and diagnosed before fertilizer application.
Information on the nutritional requirements of teak is very limited.
Drechsel and Zech (1994) developed preliminary DRIS(Diagnosis and
Recommendation Integrated System) diagnostic norms for planted teak
trees 2–5 and 12–33 years old in West Africa, but lacked norms for the
intermediate ages, and this data set did not include the acidic soil site
conditions prevalent in south China.
There is no diagnostic norms specific for teak grown on acidic site
conditions in China. So is necessary to do the research.
1. Introduction
2. Materials and methods
2.1 Study area ◆ The study area is located in Jiedong county, Jieyang city (115°36′-
116°37′E, 22°53-23°46′N), Guangdong province in southern China.
◆ Subtropical climate, lateritic red soil.
◆ About 400 ha of teak plantations at spacing of 3 3 m.
2. Materials and methods
Table 1 Characteristicsof the 19 plots established in teak plantations in Jiedong, Guangdong province
Notes: Lower =lower reaches of the slope, Upper =upper reaches of the slope, asl=above sea level.
19 representative sample plots (20 m 20 m) were identified and laid
out in 7 locations (Table 1).
Plot Location Soil
pHw
Slope
degree
Slope
aspect
Slope
position
Elevation
(m asl)
Age
(a)
Diameter
mean (cm)
Height
mean (m)
P1 Wujingshan 4.74 10° South Lower 60 7 11.45±1.92 10.2±0.35
P2 Wujingshan 4.39 10° South Upper 70 7 7.4±1.24 6.5±0.24