JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (5): 765-777.doi: 10.11849/zrzyxb.20160603

• Resource Ecology • Previous Articles     Next Articles

Effects of Converting Evergreen Broad-leaved Forests to Chinese Chestnut Forests on Soil Nitrogen, Phosphorous and Potassium Pools and Enzyme Activity

YANG Menga, YUE Tiana, LI Yong-fua,b, LI Yong-chuna,b, HE Jiea, XIAO Yong-henga, JIANG Pei-kuna,b, ZHOU Guo-moa,b   

  1. a. Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, b. The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin’an 311300, China
  • Received:2016-06-10 Revised:2016-09-26 Online:2017-05-20 Published:2017-05-20
  • Supported by:
    National Natural Science Foundation of China, No.31170576; Natural Science Foundation of Zhejiang Province, No.LY14C160007, LY15C160006

Abstract: Study on the effects of converting natural forests to plantations on soil nutrient pools has very important significance for sustainable management of forests. In order to investigate the effects of converting evergreen broad-leaved forest (EBLF) to Chinese chestnut forest (MBF) on nitrogen (N), phosphorous (P), potassium (K) pools and enzyme activity in soil, we collected soil samples at the soil surface (0-20 cm) and subsurface layers (20-40 cm) in EBLF and adjacent MBF that was converted from EBLF in Sankou Township, Lin’an City, Zhejiang Province. Different forms of N, P, K and soil invertase, urease, catalase and acid phosphatase activity of the soil sample were determined. The results showed that soil pH, WSON and MBN concentrations decreased significantly and the NH4+-N and NO3--N concentrations increased significantly in both surface and subsurface layers after converting EBLF to MBF. The total N concentrations in the surface layer increased significantly, but those in the subsurface layer had no significant change after the conversion. The Resin-Pi, NaHCO3-Pi, NaOH-Pi, HCl-Pi and Residual-P concentrations in the surface layer increased 61.4%, 53.5%, 19.2%, 55.1% and 25.3% respectively. Resin-Pi, NaHCO3-Pi, HCl-Pi and Residual-P concentrations in the subsurface layer increased 64.6%, 61.2%, 13.7% and 17.3% respectively. The NaHCO3-Po and NaOH-Po concentrations in the soil surface layer decreased 24.8% and 18.3% respectively, while those in the subsurface layer decreased 20.5% and 7.7% respectively after the conversion. The available K, slowly available K, mineral K and total K concentrations in the soil surface layer increased significantly and the available K and slowly available K concentrations in the subsurface layer also increased, but the mineral K and total K concentrations in the subsurface layer had no significant changes after the conversion. Soil invertase, urease, catalase and acid phosphatase activities in the surface layer decreased significantly; urease and acid phosphatase activities in the subsurface layer decreased significantly, but invertase and catalase activities had no significant decrease after the conversion (P < 0.05). To conclude, this forest type conversion has positive effects on soil inorganic N, P and K pools, while has negative effects on soil organic N, P and K pools and enzyme activities.

Key words: Chinese chestnut forest, soil enzyme, soil nutrient pool, natural evergreen broad-leaved forest

CLC Number: 

  • S714.2