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Effects of land use patterns on soil enzyme activity in Chongming Island.

NING Mu-lei1, GAO Huan-huan1, HUANG Tian-ying1, YU Wen-juan2, KANG Hong-zhang1,3*#br#   

  1. (1School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China; 2Instrumental Analysis Center, Shanghai Jiao Tong University, Shanghai 200240, China; 3Shanghai Urban Forest Research Station of State Forestry Administration of China, Shanghai 200240, China).
  • Online:2017-07-10 Published:2017-07-10

Abstract: In order to explore the change of soil enzyme activities under different landuse patterns, Metasequoia glyptostroboides (MG) forests (16-, 25-, 35-year-old), 20-year-old Cinnamomum camphora (CC) forest and deforested land (formerly a 25-year-old Cryptomeria fortunei forest) were investigated at Dongping National Forest Park in Chongming Island. With rice paddy field as a control, we assessed the effects of different landuse patterns on the activities of soil urease (URE), invertase (INV), catalase (CAT) and alkaline phosphatase (ALP) in 0-10, 10-20 and 20-30 cm soil layers. The results showed that: (1) The difference in the activities of the four enzymes under different landuse patterns was significant (P<0.05). Returning farmland to forests increased soil enzyme activities and improved soil properties, but deforestation had opposite effects. (2) Afforestation tree species and afforestation duration were also important factors affecting soil enzyme activities. There was a significant linear correlation between stand age and soil enzyme activities. CC had higher soil enzyme activities than MG, and improved soil microbiological properties better. (3) Soil enzyme activities decreased with the increase of soil depth. (4) There were significant or very significant correlations between INV, ALP and URE activities in the same landuse type (P<0.05 or P<0.01), while CAT activity showed relatively weak correlations with other enzymes.

Key words: carbon starvation, Robinia pseudoacacia plantation, growth decline, hydraulic failure, climate change, soil desiccation