Chin J Plan Ecolo ›› 2008, Vol. 32 ›› Issue (4): 900-907.doi: 10.3773/j.issn.1005-264x.2008.04.019

• Research Articles • Previous Articles     Next Articles

COMPARATIVE STUDIES ON SEASONAL DYNAMICS OF SOIL ENZYMATIC ACTIVITIES AND SOIL NUTRIENT AVAILABILITY IN MONO- AND MIXED- CULTURE PLANT COMMUNITIES OF AGERATINA ADENOPHORA AND SETARIA SPHACLATA

JIANG Zhi-Lin1; LIU Wan-Xue1;WAN Fang-Hao1*; LI Zheng-Yue2   

  1. 1State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, China;2Key Laboratory for Agricultural Biodiversity and Pest Management of Ministry of Education, Plant Protection College, Yunnan Agricultural University, Kunming 650201, China
  • Online:2008-07-30 Published:2008-07-30
  • Contact: WAN Fang-Hao

Abstract: Aims Our objectives were to determine: 1) the effect of different plant communities on soil enzymatic activities
and soil nutrient availability to the plants, 2) the correlation between soil enzymatic activities and soil nutrient
availability to the plants, and 3) the potential competition for resources among target species and competitive strategy of
each species.
Methods We correlated four soil enzyme activities and availability of three major soil nutrients (N, P and K) in three plant
communities: monoculture of Ageratina adenophora (A), monoculture of Setaria sphacelata (S), and mixed culture of A.
adenophora and S. sphacelata (A+S).
Important findings Concentrations of soil NH4+-N and NO3--N in community A were significantly lower than in S and A+S
(p<0.01), but there was no significant difference between A and A+S (p>0.05). The available P and K in all communities
decreased significantly in the order of A>S>A+S (p<0.01). Soil protease and urease activities in all communities decreased in
the order of S>A+S>A and A+S>S>A (p<0.01), respectively. Soil phosphatase and invertase activities increased in the order of
A+Sp<0.01), respectively. The soil NO3--N and available P and K in all communities decreased with
increasing plant age. Soil NH4+-N contents showed a unimodal concentration curve peaking in September. Soil protease and
urease activities increased in all communities with peak values in November. The activities of other soil enzymes peaked only
once in July. Correlations between soil enzymatic activities and soil nutrient availability were consistent in all
communities. S. sphacelata showed higher net ammonification and nitrification rates as compared to A. adenophora, but S.
sphacelata showed higher reduction in available P and K. This may explain why S. sphacelata out-competed A. adenophora in
community A+S. The differences in soil enzymatic activities of the different plant communities are due to a potential
mechanism that resulted in variations in the nutrients availability.

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